use indented (squiggly) heredoc strings in reader_test

1 files changed, 508 insertions, 549 deletions

diff --git a/test/reader_test.rb b/test/reader_test.rb
index 45fc7686..139dadad 100644
--- a/test/reader_test.rb
+++ b/test/reader_test.rb
@@ -4,10 +4,10 @@ require_relative 'test_helper'
 class ReaderTest < Minitest::Test
   DIRNAME = ASCIIDOCTOR_TEST_DIR
 
-  SAMPLE_DATA = <<-EOS.chomp.split(::Asciidoctor::LF)
-first line
-second line
-third line
+  SAMPLE_DATA = <<~'EOS'.chomp.split(::Asciidoctor::LF)
+  first line
+  second line
+  third line
   EOS
 
   context 'Reader' do
@@ -287,10 +287,10 @@ third line
 
     context 'Read lines until' do
       test 'Read lines until until end' do
-        lines = <<-EOS.lines
-This is one paragraph.
+        lines = <<~'EOS'.lines
+        This is one paragraph.
 
-This is another paragraph.
+        This is another paragraph.
         EOS
 
         reader = Asciidoctor::Reader.new lines, nil, normalize: true
@@ -302,10 +302,10 @@ This is another paragraph.
       end
 
       test 'Read lines until until blank line' do
-        lines = <<-EOS.lines
-This is one paragraph.
+        lines = <<~'EOS'.lines
+        This is one paragraph.
 
-This is another paragraph.
+        This is another paragraph.
         EOS
 
         reader = Asciidoctor::Reader.new lines, nil, normalize: true
@@ -316,10 +316,10 @@ This is another paragraph.
       end
 
       test 'Read lines until until blank line preserving last line' do
-        lines = <<-EOS.chomp.split(::Asciidoctor::LF)
-This is one paragraph.
+        lines = <<~'EOS'.chomp.split(::Asciidoctor::LF)
+        This is one paragraph.
 
-This is another paragraph.
+        This is another paragraph.
         EOS
 
         reader = Asciidoctor::Reader.new lines
@@ -330,14 +330,14 @@ This is another paragraph.
       end
 
       test 'Read lines until until condition is true' do
-        lines = <<-EOS.chomp.split(::Asciidoctor::LF)
---
-This is one paragraph inside the block.
+        lines = <<~'EOS'.chomp.split(::Asciidoctor::LF)
+        --
+        This is one paragraph inside the block.
 
-This is another paragraph inside the block.
---
+        This is another paragraph inside the block.
+        --
 
-This is a paragraph outside the block.
+        This is a paragraph outside the block.
         EOS
 
         reader = Asciidoctor::Reader.new lines
@@ -349,14 +349,14 @@ This is a paragraph outside the block.
       end
 
       test 'Read lines until until condition is true, taking last line' do
-        lines = <<-EOS.chomp.split(::Asciidoctor::LF)
---
-This is one paragraph inside the block.
+        lines = <<~'EOS'.chomp.split(::Asciidoctor::LF)
+        --
+        This is one paragraph inside the block.
 
-This is another paragraph inside the block.
---
+        This is another paragraph inside the block.
+        --
 
-This is a paragraph outside the block.
+        This is a paragraph outside the block.
         EOS
 
         reader = Asciidoctor::Reader.new lines
@@ -368,14 +368,14 @@ This is a paragraph outside the block.
       end
 
       test 'Read lines until until condition is true, taking and preserving last line' do
-        lines = <<-EOS.chomp.split(::Asciidoctor::LF)
---
-This is one paragraph inside the block.
+        lines = <<~'EOS'.chomp.split(::Asciidoctor::LF)
+        --
+        This is one paragraph inside the block.
 
-This is another paragraph inside the block.
---
+        This is another paragraph inside the block.
+        --
 
-This is a paragraph outside the block.
+        This is a paragraph outside the block.
         EOS
 
         reader = Asciidoctor::Reader.new lines
@@ -387,14 +387,14 @@ This is a paragraph outside the block.
       end
 
       test 'read lines until terminator' do
-        lines = <<-EOS.lines
-****
-captured
+        lines = <<~'EOS'.lines
+        ****
+        captured
 
-also captured
-****
+        also captured
+        ****
 
-not captured
+        not captured
         EOS
 
         expected = ['captured', '', 'also captured']
@@ -408,13 +408,13 @@ not captured
       end
 
       test 'should flag reader as unterminated if reader reaches end of source without finding terminator' do
-        lines = <<-EOS.lines
-****
-captured
+        lines = <<~'EOS'.lines
+        ****
+        captured
 
-also captured
+        also captured
 
-captured yet again
+        captured yet again
         EOS
 
         expected = lines[1..-1].map {|l| l.chomp }
@@ -468,12 +468,12 @@ captured yet again
       end
 
       test 'should clean CRLF from end of lines' do
-        input = <<-EOS
-source\r
-with\r
-CRLF\r
-line endings\r
-      EOS
+        input = <<~EOS
+        source\r
+        with\r
+        CRLF\r
+        line endings\r
+        EOS
 
         [input, input.lines, input.split(::Asciidoctor::LF), input.split(::Asciidoctor::LF).join(::Asciidoctor::LF)].each do |lines|
           doc = Asciidoctor::Document.new lines
@@ -487,17 +487,17 @@ line endings\r
       end
 
       test 'should not skip front matter by default' do
-        input = <<-EOS
----
-layout: post
-title: Document Title
-author: username
-tags: [ first, second ]
----
-= Document Title
-Author Name
+        input = <<~'EOS'
+        ---
+        layout: post
+        title: Document Title
+        author: username
+        tags: [ first, second ]
+        ---
+        = Document Title
+        Author Name
 
-preamble
+        preamble
         EOS
 
         doc = Asciidoctor::Document.new input
@@ -507,18 +507,21 @@ preamble
     end
 
     test 'should skip front matter if specified by skip-front-matter attribute' do
-        front_matter = %(layout: post
-title: Document Title
-author: username
-tags: [ first, second ])
-        input = <<-EOS
----
-#{front_matter}
----
-= Document Title
-Author Name
+        front_matter = <<~'EOS'.chomp
+        layout: post
+        title: Document Title
+        author: username
+        tags: [ first, second ]
+        EOS
+
+        input = <<~EOS
+        ---
+        #{front_matter}
+        ---
+        = Document Title
+        Author Name
 
-preamble
+        preamble
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'skip-front-matter' => '' }
@@ -600,19 +603,14 @@ preamble
 
     context 'Include Directive' do
       test 'include directive is disabled by default and becomes a link' do
-        input = <<-EOS
-include::include-file.adoc[]
-        EOS
+        input = 'include::include-file.adoc[]'
         doc = Asciidoctor::Document.new input
         reader = doc.reader
         assert_equal 'link:include-file.adoc[]', reader.read_line
       end
 
       test 'include directive is enabled when safe mode is less than SECURE' do
-        input = <<-EOS
-include::fixtures/include-file.adoc[]
-        EOS
-
+        input = 'include::fixtures/include-file.adoc[]'
         doc = document_from_string input, safe: :safe, header_footer: false, base_dir: DIRNAME
         output = doc.convert
         assert_match(/included content/, output)
@@ -620,10 +618,10 @@ include::fixtures/include-file.adoc[]
       end
 
       test 'should not track include in catalog for non-AsciiDoc include files' do
-        input = <<-EOS
-----
-include::fixtures/circle.svg[]
-----
+        input = <<~'EOS'
+        ----
+        include::fixtures/circle.svg[]
+        ----
         EOS
 
         doc = document_from_string input, safe: :safe, header_footer: false, base_dir: DIRNAME
@@ -631,10 +629,7 @@ include::fixtures/circle.svg[]
       end
 
       test 'include directive should resolve file with spaces in name' do
-        input = <<-EOS
-include::fixtures/include file.adoc[]
-        EOS
-
+        input = 'include::fixtures/include file.adoc[]'
         include_file = File.join DIRNAME, 'fixtures', 'include-file.adoc'
         include_file_with_sp = File.join DIRNAME, 'fixtures', 'include file.adoc'
         begin
@@ -648,10 +643,7 @@ include::fixtures/include file.adoc[]
       end
 
       test 'include directive should resolve file with {sp} in name' do
-        input = <<-EOS
-include::fixtures/include{sp}file.adoc[]
-        EOS
-
+        input = 'include::fixtures/include{sp}file.adoc[]'
         include_file = File.join DIRNAME, 'fixtures', 'include-file.adoc'
         include_file_with_sp = File.join DIRNAME, 'fixtures', 'include file.adoc'
         begin
@@ -665,10 +657,7 @@ include::fixtures/include{sp}file.adoc[]
       end
 
       test 'include directive should resolve file relative to current include' do
-        input = <<-EOS
-include::fixtures/parent-include.adoc[]
-        EOS
-
+        input = 'include::fixtures/parent-include.adoc[]'
         pseudo_docfile = File.join DIRNAME, 'include-master.adoc'
         fixtures_dir = File.join DIRNAME, 'fixtures'
         parent_include_docfile = File.join fixtures_dir, 'parent-include.adoc'
@@ -726,10 +715,7 @@ include::fixtures/parent-include.adoc[]
       end
 
       test 'include directive should process lines when file extension of target is .asciidoc' do
-        input = <<-EOS
-include::fixtures/include-alt-extension.asciidoc[]
-        EOS
-
+        input = 'include::fixtures/include-alt-extension.asciidoc[]'
         doc = document_from_string input, safe: :safe, base_dir: DIRNAME
         assert_equal 3, doc.blocks.size
         assert_equal ['first line'], doc.blocks[0].lines
@@ -738,10 +724,10 @@ include::fixtures/include-alt-extension.asciidoc[]
       end
 
       test 'missing file referenced by include directive is skipped when optional option is set' do
-        input = <<-EOS
-include::fixtures/no-such-file.adoc[opts=optional]
+        input = <<~'EOS'
+        include::fixtures/no-such-file.adoc[opts=optional]
 
-trailing content
+        trailing content
         EOS
 
         begin
@@ -757,10 +743,10 @@ trailing content
       end
 
       test 'missing file referenced by include directive is replaced by warning' do
-        input = <<-EOS
-include::fixtures/no-such-file.adoc[]
+        input = <<~'EOS'
+        include::fixtures/no-such-file.adoc[]
 
-trailing content
+        trailing content
         EOS
 
         begin
@@ -779,10 +765,10 @@ trailing content
       test 'unreadable file referenced by include directive is replaced by warning' do
         include_file = File.join DIRNAME, 'fixtures', 'chapter-a.adoc'
         FileUtils.chmod 0000, include_file
-        input = <<-EOS
-include::fixtures/chapter-a.adoc[]
+        input = <<~'EOS'
+        include::fixtures/chapter-a.adoc[]
 
-trailing content
+        trailing content
         EOS
 
         begin
@@ -803,8 +789,8 @@ trailing content
       # IMPORTANT this test needs to be run on Windows to verify proper behavior in Windows
       test 'can resolve include directive with absolute path' do
         include_path = ::File.join DIRNAME, 'fixtures', 'chapter-a.adoc'
-        input = <<-EOS
-include::#{include_path}[]
+        input = <<~EOS
+        include::#{include_path}[]
         EOS
         result = document_from_string input, safe: :safe
         assert_equal 'Chapter A', result.doctitle
@@ -815,10 +801,10 @@ include::#{include_path}[]
 
       test 'include directive can retrieve data from uri' do
         url = %(http://#{resolve_localhost}:9876/name/asciidoctor)
-        input = <<-EOS
-....
-include::#{url}[]
-....
+        input = <<~EOS
+        ....
+        include::#{url}[]
+        ....
         EOS
         expect = /\{"name": "asciidoctor"\}/
         output = using_test_webserver do
@@ -830,59 +816,63 @@ include::#{url}[]
       end
 
       test 'nested include directives are resolved relative to current file' do
-        input = <<-EOS
-....
-include::fixtures/outer-include.adoc[]
-....
+        input = <<~'EOS'
+        ....
+        include::fixtures/outer-include.adoc[]
+        ....
         EOS
 
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
-        expected = 'first line of outer
+        expected = <<~'EOS'.chomp
+        first line of outer
 
-first line of middle
+        first line of middle
 
-first line of inner
+        first line of inner
 
-last line of inner
+        last line of inner
 
-last line of middle
+        last line of middle
 
-last line of outer'
+        last line of outer
+        EOS
         assert_includes output, expected
       end
 
       test 'nested remote include directive is resolved relative to uri of current file' do
         url = %(http://#{resolve_localhost}:9876/fixtures/outer-include.adoc)
-        input = <<-EOS
-....
-include::#{url}[]
-....
+        input = <<~EOS
+        ....
+        include::#{url}[]
+        ....
         EOS
         output = using_test_webserver do
           convert_string_to_embedded input, safe: :safe, attributes: { 'allow-uri-read' => '' }
         end
 
-        expected = 'first line of outer
+        expected = <<~'EOS'.chomp
+        first line of outer
 
-first line of middle
+        first line of middle
 
-first line of inner
+        first line of inner
 
-last line of inner
+        last line of inner
 
-last line of middle
+        last line of middle
 
-last line of outer'
+        last line of outer
+        EOS
         assert_includes output, expected
       end
 
       test 'nested remote include directive that cannot be resolved does not crash processor' do
         include_url = %(http://#{resolve_localhost}:9876/fixtures/file-with-missing-include.adoc)
         nested_include_url = 'no-such-file.adoc'
-        input = <<-EOS
-....
-include::#{include_url}[]
-....
+        input = <<~EOS
+        ....
+        include::#{include_url}[]
+        ....
         EOS
         begin
           using_memory_logger do |logger|
@@ -899,28 +889,30 @@ include::#{include_url}[]
 
       test 'tag filtering is supported for remote includes' do
         url = %(http://#{resolve_localhost}:9876/fixtures/tagged-class.rb)
-        input = <<-EOS
-[source,ruby]
-----
-include::#{url}[tag=init,indent=0]
-----
+        input = <<~EOS
+        [source,ruby]
+        ----
+        include::#{url}[tag=init,indent=0]
+        ----
         EOS
         output = using_test_webserver do
           convert_string_to_embedded input, safe: :safe, attributes: { 'allow-uri-read' => '' }
         end
 
-        expected = '<code class="language-ruby" data-lang="ruby">def initialize breed
-  @breed = breed
-end</code>'
+        expected = <<~EOS.chomp
+        <code class="language-ruby" data-lang="ruby">def initialize breed
+          @breed = breed
+        end</code>
+        EOS
         assert_includes output, expected
       end
 
       test 'inaccessible uri referenced by include directive does not crash processor' do
         url = %(http://#{resolve_localhost}:9876/no_such_file)
-        input = <<-EOS
-....
-include::#{url}[]
-....
+        input = <<~EOS
+        ....
+        include::#{url}[]
+        ....
         EOS
 
         begin
@@ -938,10 +930,7 @@ include::#{url}[]
       end
 
       test 'include directive supports selecting lines by line number' do
-        input = <<-EOS
-include::fixtures/include-file.adoc[lines=1;3..4;6..-1]
-        EOS
-
+        input = 'include::fixtures/include-file.adoc[lines=1;3..4;6..-1]'
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
         assert_match(/first line/, output)
         refute_match(/second line/, output)
@@ -955,10 +944,7 @@ include::fixtures/include-file.adoc[lines=1;3..4;6..-1]
       end
 
       test 'include directive supports line ranges specified in quoted attribute value' do
-        input = <<-EOS
-include::fixtures/include-file.adoc[lines="1, 3..4 , 6 .. -1"]
-        EOS
-
+        input = 'include::fixtures/include-file.adoc[lines="1, 3..4 , 6 .. -1"]'
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
         assert_match(/first line/, output)
         refute_match(/second line/, output)
@@ -972,10 +958,7 @@ include::fixtures/include-file.adoc[lines="1, 3..4 , 6 .. -1"]
       end
 
       test 'include directive supports implicit endless range' do
-        input = <<-EOS
-include::fixtures/include-file.adoc[lines=6..]
-        EOS
-
+        input = 'include::fixtures/include-file.adoc[lines=6..]'
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
         refute_match(/first line/, output)
         refute_match(/second line/, output)
@@ -989,10 +972,10 @@ include::fixtures/include-file.adoc[lines=6..]
       end
 
       test 'include directive ignores empty lines attribute' do
-        input = <<-EOS
-++++
-include::fixtures/include-file.adoc[lines=]
-++++
+        input = <<~'EOS'
+        ++++
+        include::fixtures/include-file.adoc[lines=]
+        ++++
         EOS
 
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
@@ -1001,10 +984,7 @@ include::fixtures/include-file.adoc[lines=]
       end
 
       test 'include directive supports selecting lines by tag' do
-        input = <<-EOS
-include::fixtures/include-file.adoc[tag=snippetA]
-        EOS
-
+        input = 'include::fixtures/include-file.adoc[tag=snippetA]'
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
         assert_match(/snippetA content/, output)
         refute_match(/snippetB content/, output)
@@ -1013,10 +993,7 @@ include::fixtures/include-file.adoc[tag=snippetA]
       end
 
       test 'include directive supports selecting lines by tags' do
-        input = <<-EOS
-include::fixtures/include-file.adoc[tags=snippetA;snippetB]
-        EOS
-
+        input = 'include::fixtures/include-file.adoc[tags=snippetA;snippetB]'
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
         assert_match(/snippetA content/, output)
         assert_match(/snippetB content/, output)
@@ -1030,11 +1007,11 @@ include::fixtures/include-file.adoc[tags=snippetA;snippetB]
           'include-file.ml' => 'let s = SS.empty;;',
           'include-file.jsx' => '<p>Welcome to the club.</p>',
         }.each do |filename, expect|
-          input = <<-EOS
-[source,xml]
-----
-include::fixtures/#{filename}[tag=snippet,indent=0]
-----
+          input = <<~EOS
+          [source,xml]
+          ----
+          include::fixtures/#{filename}[tag=snippet,indent=0]
+          ----
           EOS
 
           doc = document_from_string input, safe: :safe, base_dir: DIRNAME
@@ -1048,8 +1025,8 @@ include::fixtures/#{filename}[tag=snippet,indent=0]
           tmp_include_dir, tmp_include_path = File.split tmp_include.path
           tmp_include.write %(do not include\r\ntag::include-me[]\r\nincluded line\r\nend::include-me[]\r\ndo not include\r\n)
           tmp_include.close
-          input = <<-EOS
-include::#{tmp_include_path}[tag=include-me]
+          input = <<~EOS
+          include::#{tmp_include_path}[tag=include-me]
           EOS
           output = convert_string_to_embedded input, safe: :safe, base_dir: tmp_include_dir
           assert_includes output, 'included line'
@@ -1065,8 +1042,8 @@ include::#{tmp_include_path}[tag=include-me]
           tmp_include_dir, tmp_include_path = File.split tmp_include.path
           tmp_include.write %(line not included\ntag::include-me[]\nline included\nend::include-me[])
           tmp_include.close
-          input = <<-EOS
-include::#{tmp_include_path}[tag=include-me]
+          input = <<~EOS
+          include::#{tmp_include_path}[tag=include-me]
           EOS
           using_memory_logger do |logger|
             output = convert_string_to_embedded input, safe: :safe, base_dir: tmp_include_dir
@@ -1080,157 +1057,167 @@ include::#{tmp_include_path}[tag=include-me]
       end
 
       test 'include directive does not select lines with tag directives within selected tag region' do
-        input = <<-EOS
-++++
-include::fixtures/include-file.adoc[tags=snippet]
-++++
+        input = <<~'EOS'
+        ++++
+        include::fixtures/include-file.adoc[tags=snippet]
+        ++++
         EOS
 
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
-        expect = %(snippetA content
+        expect = <<~'EOS'.chomp
+        snippetA content
 
-non-tagged content
+        non-tagged content
 
-snippetB content)
+        snippetB content
+        EOS
         assert_equal expect, output
       end
 
       test 'include directive skips lines marked with negated tags' do
-        input = <<-EOS
-----
-include::fixtures/tagged-class-enclosed.rb[tags=all;!bark]
-----
+        input = <<~'EOS'
+        ----
+        include::fixtures/tagged-class-enclosed.rb[tags=all;!bark]
+        ----
         EOS
 
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
-        expected = %(class Dog
-  def initialize breed
-    @breed = breed
-  end
-end)
+        expected = <<~EOS.chomp
+        class Dog
+          def initialize breed
+            @breed = breed
+          end
+        end
+        EOS
         assert_includes output, expected
       end
 
       test 'include directive takes all lines without tag directives when value is double asterisk' do
-        input = <<-EOS
-----
-include::fixtures/tagged-class.rb[tags=**]
-----
+        input = <<~'EOS'
+        ----
+        include::fixtures/tagged-class.rb[tags=**]
+        ----
         EOS
 
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
-        expected = %(class Dog
-  def initialize breed
-    @breed = breed
-  end
+        expected = <<~EOS.chomp
+        class Dog
+          def initialize breed
+            @breed = breed
+          end
 
-  def bark
-    if @breed == 'beagle'
-      'woof woof woof woof woof'
-    else
-      'woof woof'
-    end
-  end
-end)
+          def bark
+            if @breed == 'beagle'
+              'woof woof woof woof woof'
+            else
+              'woof woof'
+            end
+          end
+        end
+        EOS
         assert_includes output, expected
       end
 
       test 'include directive takes all lines except negated tags when value contains double asterisk' do
-        input = <<-EOS
-----
-include::fixtures/tagged-class.rb[tags=**;!bark]
-----
+        input = <<~'EOS'
+        ----
+        include::fixtures/tagged-class.rb[tags=**;!bark]
+        ----
         EOS
 
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
-        expected = %(class Dog
-  def initialize breed
-    @breed = breed
-  end
-end)
+        expected = <<~EOS.chomp
+        class Dog
+          def initialize breed
+            @breed = breed
+          end
+        end
+        EOS
         assert_includes output, expected
       end
 
       test 'include directive selects lines for all tags when value of tags attribute is wildcard' do
-        input = <<-EOS
-----
-include::fixtures/tagged-class-enclosed.rb[tags=*]
-----
+        input = <<~'EOS'
+        ----
+        include::fixtures/tagged-class-enclosed.rb[tags=*]
+        ----
         EOS
 
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
-        expected = %(class Dog
-  def initialize breed
-    @breed = breed
-  end
+        expected = <<~EOS.chomp
+        class Dog
+          def initialize breed
+            @breed = breed
+          end
 
-  def bark
-    if @breed == 'beagle'
-      'woof woof woof woof woof'
-    else
-      'woof woof'
-    end
-  end
-end)
+          def bark
+            if @breed == 'beagle'
+              'woof woof woof woof woof'
+            else
+              'woof woof'
+            end
+          end
+        end
+        EOS
         assert_includes output, expected
       end
 
       test 'include directive selects lines for all tags except exclusions when value of tags attribute is wildcard' do
-        input = <<-EOS
-----
-include::fixtures/tagged-class-enclosed.rb[tags=*;!init]
-----
+        input = <<~'EOS'
+        ----
+        include::fixtures/tagged-class-enclosed.rb[tags=*;!init]
+        ----
         EOS
 
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
-        expected = %(class Dog
-
-  def bark
-    if @breed == 'beagle'
-      'woof woof woof woof woof'
-    else
-      'woof woof'
-    end
-  end
-end)
+        expected = <<~EOS.chomp
+        class Dog
+
+          def bark
+            if @breed == 'beagle'
+              'woof woof woof woof woof'
+            else
+              'woof woof'
+            end
+          end
+        end
+        EOS
         assert_includes output, expected
       end
 
       test 'include directive skips lines all tagged lines when value of tags attribute is negated wildcard' do
-        input = <<-EOS
-----
-include::fixtures/tagged-class.rb[tags=!*]
-----
+        input = <<~'EOS'
+        ----
+        include::fixtures/tagged-class.rb[tags=!*]
+        ----
         EOS
 
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
-        expected = %(class Dog
-end)
+        expected = %(class Dog\nend)
         assert_includes output, expected
       end
 
       test 'include directive selects specified tagged lines and ignores the other tag directives' do
-        input = <<-EOS
-[indent=0]
-----
-include::fixtures/tagged-class.rb[tags=bark;!bark-other]
-----
+        input = <<~'EOS'
+        [indent=0]
+        ----
+        include::fixtures/tagged-class.rb[tags=bark;!bark-other]
+        ----
         EOS
 
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
-        expected = %(def bark
-  if @breed == 'beagle'
-    'woof woof woof woof woof'
-  end
-end)
+        expected = <<~EOS.chomp
+        def bark
+          if @breed == 'beagle'
+            'woof woof woof woof woof'
+          end
+        end
+        EOS
         assert_includes output, expected
       end
 
       test 'should warn if specified tag is not found in include file' do
-        input = <<-EOS
-include::fixtures/include-file.adoc[tag=no-such-tag]
-        EOS
-
+        input = 'include::fixtures/include-file.adoc[tag=no-such-tag]'
         using_memory_logger do |logger|
           convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
           assert_message logger, :WARN, %(~<stdin>: line 1: tag 'no-such-tag' not found in include file), Hash
@@ -1238,10 +1225,10 @@ include::fixtures/include-file.adoc[tag=no-such-tag]
       end
 
       test 'should warn if specified tags are not found in include file' do
-        input = <<-EOS
-++++
-include::fixtures/include-file.adoc[tags=no-such-tag-b;no-such-tag-a]
-++++
+        input = <<~'EOS'
+        ++++
+        include::fixtures/include-file.adoc[tags=no-such-tag-b;no-such-tag-a]
+        ++++
         EOS
 
         using_memory_logger do |logger|
@@ -1252,10 +1239,10 @@ include::fixtures/include-file.adoc[tags=no-such-tag-b;no-such-tag-a]
       end
 
       test 'should warn if specified tag in include file is not closed' do
-        input = <<-EOS
-++++
-include::fixtures/unclosed-tag.adoc[tag=a]
-++++
+        input = <<~'EOS'
+        ++++
+        include::fixtures/unclosed-tag.adoc[tag=a]
+        ++++
         EOS
 
         using_memory_logger do |logger|
@@ -1267,10 +1254,10 @@ include::fixtures/unclosed-tag.adoc[tag=a]
       end
 
       test 'should warn if end tag in included file is mismatched' do
-        input = <<-EOS
-++++
-include::fixtures/mismatched-end-tag.adoc[tags=a;b]
-++++
+        input = <<~'EOS'
+        ++++
+        include::fixtures/mismatched-end-tag.adoc[tags=a;b]
+        ++++
         EOS
 
         inc_path = File.join DIRNAME, 'fixtures/mismatched-end-tag.adoc'
@@ -1283,10 +1270,10 @@ include::fixtures/mismatched-end-tag.adoc[tags=a;b]
       end
 
       test 'should warn if unexpected end tag is found in included file' do
-        input = <<-EOS
-++++
-include::fixtures/unexpected-end-tag.adoc[tags=a]
-++++
+        input = <<~'EOS'
+        ++++
+        include::fixtures/unexpected-end-tag.adoc[tags=a]
+        ++++
         EOS
 
         inc_path = File.join DIRNAME, 'fixtures/unexpected-end-tag.adoc'
@@ -1300,10 +1287,10 @@ include::fixtures/unexpected-end-tag.adoc[tags=a]
 
       test 'include directive ignores tags attribute when empty' do
         ['tag', 'tags'].each do |attr_name|
-          input = <<-EOS
-++++
-include::fixtures/include-file.xml[#{attr_name}=]
-++++
+          input = <<~EOS
+          ++++
+          include::fixtures/include-file.xml[#{attr_name}=]
+          ++++
           EOS
 
           output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
@@ -1312,10 +1299,7 @@ include::fixtures/include-file.xml[#{attr_name}=]
       end
 
       test 'lines attribute takes precedence over tags attribute in include directive' do
-        input = <<-EOS
-include::fixtures/include-file.adoc[lines=1, tags=snippetA;snippetB]
-        EOS
-
+        input = 'include::fixtures/include-file.adoc[lines=1, tags=snippetA;snippetB]'
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
         assert_match(/first line of included content/, output)
         refute_match(/snippetA content/, output)
@@ -1323,11 +1307,11 @@ include::fixtures/include-file.adoc[lines=1, tags=snippetA;snippetB]
       end
 
       test 'indent of included file can be reset to size of indent attribute' do
-        input = <<-EOS
-[source, xml]
-----
-include::fixtures/basic-docinfo.xml[lines=2..3, indent=0]
-----
+        input = <<~'EOS'
+        [source, xml]
+        ----
+        include::fixtures/basic-docinfo.xml[lines=2..3, indent=0]
+        ----
         EOS
 
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
@@ -1336,9 +1320,9 @@ include::fixtures/basic-docinfo.xml[lines=2..3, indent=0]
       end
 
       test 'should substitute attribute references in attrlist' do
-        input = <<-EOS
-:name-of-tag: snippetA
-include::fixtures/include-file.adoc[tag={name-of-tag}]
+        input = <<~'EOS'
+        :name-of-tag: snippetA
+        include::fixtures/include-file.adoc[tag={name-of-tag}]
         EOS
 
         output = convert_string_to_embedded input, safe: :safe, base_dir: DIRNAME
@@ -1349,10 +1333,7 @@ include::fixtures/include-file.adoc[tag={name-of-tag}]
       end
 
       test 'should fall back to built-in include directive behavior when not handled by include processor' do
-        input = <<-EOS
-include::fixtures/include-file.adoc[]
-        EOS
-
+        input = 'include::fixtures/include-file.adoc[]'
         include_processor = Class.new do
           def initialize document
           end
@@ -1375,22 +1356,19 @@ include::fixtures/include-file.adoc[]
       end
 
       test 'leveloffset attribute entries should be added to content if leveloffset attribute is specified' do
-        input = <<-EOS
-include::fixtures/master.adoc[]
-        EOS
-
-        expected = <<-EOS.chomp.split(::Asciidoctor::LF)
-= Master Document
+        input = 'include::fixtures/master.adoc[]'
+        expected = <<~'EOS'.chomp.split(::Asciidoctor::LF)
+        = Master Document
 
-preamble
+        preamble
 
-:leveloffset: +1
+        :leveloffset: +1
 
-= Chapter A
+        = Chapter A
 
-content
+        content
 
-:leveloffset!:
+        :leveloffset!:
         EOS
 
         document = Asciidoctor.load input, safe: :safe, base_dir: DIRNAME, parse: false
@@ -1398,11 +1376,11 @@ content
       end
 
       test 'attributes are substituted in target of include directive' do
-        input = <<-EOS
-:fixturesdir: fixtures
-:ext: adoc
+        input = <<~'EOS'
+        :fixturesdir: fixtures
+        :ext: adoc
 
-include::{fixturesdir}/include-file.{ext}[]
+        include::{fixturesdir}/include-file.{ext}[]
         EOS
 
         doc = document_from_string input, safe: :safe, base_dir: DIRNAME
@@ -1411,10 +1389,7 @@ include::{fixturesdir}/include-file.{ext}[]
       end
 
       test 'line is skipped by default if target of include directive resolves to empty' do
-        input = <<-EOS
-include::{foodir}/include-file.adoc[]
-        EOS
-
+        input = 'include::{foodir}/include-file.adoc[]'
         using_memory_logger do |logger|
           doc = empty_safe_document base_dir: DIRNAME
           reader = Asciidoctor::PreprocessorReader.new doc, input, nil, normalize: true
@@ -1425,10 +1400,7 @@ include::{foodir}/include-file.adoc[]
       end
 
       test 'line is dropped if target of include directive resolves to empty and attribute-missing attribute is not skip' do
-        input = <<-EOS
-include::{foodir}/include-file.adoc[]
-        EOS
-
+        input = 'include::{foodir}/include-file.adoc[]'
         using_memory_logger do |logger|
           doc = empty_safe_document base_dir: DIRNAME, attributes: { 'attribute-missing' => 'drop' }
           reader = Asciidoctor::PreprocessorReader.new doc, input, nil, normalize: true
@@ -1439,9 +1411,9 @@ include::{foodir}/include-file.adoc[]
       end
 
       test 'line following dropped include is not dropped' do
-        input = <<-EOS
-include::{foodir}/include-file.adoc[]
-yo
+        input = <<~'EOS'
+        include::{foodir}/include-file.adoc[]
+        yo
         EOS
 
         using_memory_logger do |logger|
@@ -1454,9 +1426,9 @@ yo
       end
 
       test 'escaped include directive is left unprocessed' do
-        input = <<-EOS
-\\include::fixtures/include-file.adoc[]
-\\escape preserved here
+        input = <<~'EOS'
+        \include::fixtures/include-file.adoc[]
+        \escape preserved here
         EOS
         doc = empty_safe_document base_dir: DIRNAME
         reader = Asciidoctor::PreprocessorReader.new doc, input, nil, normalize: true
@@ -1469,9 +1441,7 @@ yo
       end
 
       test 'include directive not at start of line is ignored' do
-        input = <<-EOS
- include::include-file.adoc[]
-        EOS
+        input = ' include::include-file.adoc[]'
         para = block_from_string input
         assert_equal 1, para.lines.size
         # NOTE the space gets stripped because the line is treated as an inline literal
@@ -1480,19 +1450,17 @@ yo
       end
 
       test 'include directive is disabled when max-include-depth attribute is 0' do
-        input = <<-EOS
-include::include-file.adoc[]
-        EOS
+        input = 'include::include-file.adoc[]'
         para = block_from_string input, safe: :safe, attributes: { 'max-include-depth' => 0 }
         assert_equal 1, para.lines.size
         assert_equal 'include::include-file.adoc[]', para.source
       end
 
       test 'max-include-depth cannot be set by document' do
-        input = <<-EOS
-:max-include-depth: 1
+        input = <<~'EOS'
+        :max-include-depth: 1
 
-include::include-file.adoc[]
+        include::include-file.adoc[]
         EOS
         para = block_from_string input, safe: :safe, attributes: { 'max-include-depth' => 0 }
         assert_equal 1, para.lines.size
@@ -1500,10 +1468,7 @@ include::include-file.adoc[]
       end
 
       test 'include directive should be disabled if max include depth has been exceeded' do
-        input = <<-EOS
-include::fixtures/parent-include.adoc[depth=1]
-        EOS
-
+        input = 'include::fixtures/parent-include.adoc[depth=1]'
         using_memory_logger do |logger|
           pseudo_docfile = File.join DIRNAME, 'include-master.adoc'
           doc = empty_safe_document base_dir: DIRNAME
@@ -1515,10 +1480,7 @@ include::fixtures/parent-include.adoc[depth=1]
       end
 
       test 'include directive should be disabled if max include depth set in nested context has been exceeded' do
-        input = <<-EOS
-include::fixtures/parent-include-restricted.adoc[depth=3]
-        EOS
-
+        input = 'include::fixtures/parent-include-restricted.adoc[depth=3]'
         using_memory_logger do |logger|
           pseudo_docfile = File.join DIRNAME, 'include-master.adoc'
           doc = empty_safe_document base_dir: DIRNAME
@@ -1531,10 +1493,10 @@ include::fixtures/parent-include-restricted.adoc[depth=3]
       end
 
       test 'read_lines_until should not process lines if process option is false' do
-        lines = <<-EOS.lines
-////
-include::fixtures/no-such-file.adoc[]
-////
+        lines = <<~'EOS'.lines
+        ////
+        include::fixtures/no-such-file.adoc[]
+        ////
         EOS
 
         doc = empty_safe_document base_dir: DIRNAME
@@ -1545,10 +1507,10 @@ include::fixtures/no-such-file.adoc[]
       end
 
       test 'skip_comment_lines should not process lines read' do
-        lines = <<-EOS.lines
-////
-include::fixtures/no-such-file.adoc[]
-////
+        lines = <<~'EOS'.lines
+        ////
+        include::fixtures/no-such-file.adoc[]
+        ////
         EOS
 
         using_memory_logger do |logger|
@@ -1563,10 +1525,10 @@ include::fixtures/no-such-file.adoc[]
 
     context 'Conditional Inclusions' do
       test 'process_line returns nil if cursor advanced' do
-        input = <<-EOS
-ifdef::asciidoctor[]
-Asciidoctor!
-endif::asciidoctor[]
+        input = <<~'EOS'
+        ifdef::asciidoctor[]
+        Asciidoctor!
+        endif::asciidoctor[]
         EOS
 
         doc = Asciidoctor::Document.new input
@@ -1575,10 +1537,10 @@ endif::asciidoctor[]
       end
 
       test 'peek_line advances cursor to next conditional line of content' do
-        input = <<-EOS
-ifdef::asciidoctor[]
-Asciidoctor!
-endif::asciidoctor[]
+        input = <<~'EOS'
+        ifdef::asciidoctor[]
+        Asciidoctor!
+        endif::asciidoctor[]
         EOS
 
         doc = Asciidoctor::Document.new input
@@ -1589,9 +1551,9 @@ endif::asciidoctor[]
       end
 
       test 'peek_lines should preprocess lines if direct is false' do
-        input = <<-EOS
-The Asciidoctor
-ifdef::asciidoctor[is in.]
+        input = <<~'EOS'
+        The Asciidoctor
+        ifdef::asciidoctor[is in.]
         EOS
         doc = Asciidoctor::Document.new input
         reader = doc.reader
@@ -1600,9 +1562,9 @@ ifdef::asciidoctor[is in.]
       end
 
       test 'peek_lines should not preprocess lines if direct is true' do
-        input = <<-EOS
-The Asciidoctor
-ifdef::asciidoctor[is in.]
+        input = <<~'EOS'
+        The Asciidoctor
+        ifdef::asciidoctor[is in.]
         EOS
         doc = Asciidoctor::Document.new input
         reader = doc.reader
@@ -1611,9 +1573,9 @@ ifdef::asciidoctor[is in.]
       end
 
       test 'peek_lines should not prevent subsequent preprocessing of peeked lines' do
-        input = <<-EOS
-The Asciidoctor
-ifdef::asciidoctor[is in.]
+        input = <<~'EOS'
+        The Asciidoctor
+        ifdef::asciidoctor[is in.]
         EOS
         doc = Asciidoctor::Document.new input
         reader = doc.reader
@@ -1623,11 +1585,11 @@ ifdef::asciidoctor[is in.]
       end
 
       test 'process_line returns line if cursor not advanced' do
-        input = <<-EOS
-content
-ifdef::asciidoctor[]
-Asciidoctor!
-endif::asciidoctor[]
+        input = <<~'EOS'
+        content
+        ifdef::asciidoctor[]
+        Asciidoctor!
+        endif::asciidoctor[]
         EOS
 
         doc = Asciidoctor::Document.new input
@@ -1636,11 +1598,11 @@ endif::asciidoctor[]
       end
 
       test 'peek_line does not advance cursor when on a regular content line' do
-        input = <<-EOS
-content
-ifdef::asciidoctor[]
-Asciidoctor!
-endif::asciidoctor[]
+        input = <<~'EOS'
+        content
+        ifdef::asciidoctor[]
+        Asciidoctor!
+        endif::asciidoctor[]
         EOS
 
         doc = Asciidoctor::Document.new input
@@ -1651,10 +1613,10 @@ endif::asciidoctor[]
       end
 
       test 'peek_line returns nil if cursor advances past end of source' do
-        input = <<-EOS
-ifdef::foobar[]
-swallowed content
-endif::foobar[]
+        input = <<~'EOS'
+        ifdef::foobar[]
+        swallowed content
+        endif::foobar[]
         EOS
 
         doc = Asciidoctor::Document.new input
@@ -1665,10 +1627,10 @@ endif::foobar[]
       end
 
       test 'ifdef with defined attribute includes content' do
-        input = <<-EOS
-ifdef::holygrail[]
-There is a holy grail!
-endif::holygrail[]
+        input = <<~'EOS'
+        ifdef::holygrail[]
+        There is a holy grail!
+        endif::holygrail[]
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'holygrail' => '' }
@@ -1681,10 +1643,10 @@ endif::holygrail[]
       end
 
       test 'ifdef with defined attribute includes text in brackets' do
-        input = <<-EOS
-On our quest we go...
-ifdef::holygrail[There is a holy grail!]
-There was much rejoicing.
+        input = <<~'EOS'
+        On our quest we go...
+        ifdef::holygrail[There is a holy grail!]
+        There was much rejoicing.
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'holygrail' => '' }
@@ -1697,10 +1659,7 @@ There was much rejoicing.
       end
 
       test 'ifdef with defined attribute processes include directive in brackets' do
-        input = <<-EOS
-ifdef::asciidoctor-version[include::fixtures/include-file.adoc[tag=snippetA]]
-        EOS
-
+        input = 'ifdef::asciidoctor-version[include::fixtures/include-file.adoc[tag=snippetA]]'
         doc = Asciidoctor::Document.new input, safe: :safe, base_dir: DIRNAME
         reader = doc.reader
         lines = []
@@ -1711,10 +1670,10 @@ ifdef::asciidoctor-version[include::fixtures/include-file.adoc[tag=snippetA]]
       end
 
       test 'ifdef attribute name is not case sensitive' do
-        input = <<-EOS
-ifdef::showScript[]
-The script is shown!
-endif::showScript[]
+        input = <<~'EOS'
+        ifdef::showScript[]
+        The script is shown!
+        endif::showScript[]
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'showscript' => '' }
@@ -1723,10 +1682,10 @@ endif::showScript[]
       end
 
       test 'ifndef with defined attribute does not include text in brackets' do
-        input = <<-EOS
-On our quest we go...
-ifndef::hardships[There is a holy grail!]
-There was no rejoicing.
+        input = <<~'EOS'
+        On our quest we go...
+        ifndef::hardships[There is a holy grail!]
+        There was no rejoicing.
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'hardships' => '' }
@@ -1739,14 +1698,14 @@ There was no rejoicing.
       end
 
       test 'include with non-matching nested exclude' do
-        input = <<-EOS
-ifdef::grail[]
-holy
-ifdef::swallow[]
-swallow
-endif::swallow[]
-grail
-endif::grail[]
+        input = <<~'EOS'
+        ifdef::grail[]
+        holy
+        ifdef::swallow[]
+        swallow
+        endif::swallow[]
+        grail
+        endif::grail[]
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'grail' => '' }
@@ -1759,12 +1718,12 @@ endif::grail[]
       end
 
       test 'nested excludes with same condition' do
-        input = <<-EOS
-ifndef::grail[]
-ifndef::grail[]
-not here
-endif::grail[]
-endif::grail[]
+        input = <<~'EOS'
+        ifndef::grail[]
+        ifndef::grail[]
+        not here
+        endif::grail[]
+        endif::grail[]
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'grail' => '' }
@@ -1777,14 +1736,14 @@ endif::grail[]
       end
 
       test 'include with nested exclude of inverted condition' do
-        input = <<-EOS
-ifdef::grail[]
-holy
-ifndef::grail[]
-not here
-endif::grail[]
-grail
-endif::grail[]
+        input = <<~'EOS'
+        ifdef::grail[]
+        holy
+        ifndef::grail[]
+        not here
+        endif::grail[]
+        grail
+        endif::grail[]
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'grail' => '' }
@@ -1797,16 +1756,16 @@ endif::grail[]
       end
 
       test 'exclude with matching nested exclude' do
-        input = <<-EOS
-poof
-ifdef::swallow[]
-no
-ifdef::swallow[]
-swallow
-endif::swallow[]
-here
-endif::swallow[]
-gone
+        input = <<~'EOS'
+        poof
+        ifdef::swallow[]
+        no
+        ifdef::swallow[]
+        swallow
+        endif::swallow[]
+        here
+        endif::swallow[]
+        gone
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'grail' => '' }
@@ -1819,16 +1778,16 @@ gone
       end
 
       test 'exclude with nested include using shorthand end' do
-        input = <<-EOS
-poof
-ifndef::grail[]
-no grail
-ifndef::swallow[]
-or swallow
-endif::[]
-in here
-endif::[]
-gone
+        input = <<~'EOS'
+        poof
+        ifndef::grail[]
+        no grail
+        ifndef::swallow[]
+        or swallow
+        endif::[]
+        in here
+        endif::[]
+        gone
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'grail' => '' }
@@ -1841,10 +1800,10 @@ gone
       end
 
       test 'ifdef with one alternative attribute set includes content' do
-        input = <<-EOS
-ifdef::holygrail,swallow[]
-Our quest is complete!
-endif::holygrail,swallow[]
+        input = <<~'EOS'
+        ifdef::holygrail,swallow[]
+        Our quest is complete!
+        endif::holygrail,swallow[]
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'swallow' => '' }
@@ -1857,10 +1816,10 @@ endif::holygrail,swallow[]
       end
 
       test 'ifdef with no alternative attributes set does not include content' do
-        input = <<-EOS
-ifdef::holygrail,swallow[]
-Our quest is complete!
-endif::holygrail,swallow[]
+        input = <<~'EOS'
+        ifdef::holygrail,swallow[]
+        Our quest is complete!
+        endif::holygrail,swallow[]
         EOS
 
         doc = Asciidoctor::Document.new input
@@ -1873,10 +1832,10 @@ endif::holygrail,swallow[]
       end
 
       test 'ifdef with all required attributes set includes content' do
-        input = <<-EOS
-ifdef::holygrail+swallow[]
-Our quest is complete!
-endif::holygrail+swallow[]
+        input = <<~'EOS'
+        ifdef::holygrail+swallow[]
+        Our quest is complete!
+        endif::holygrail+swallow[]
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'holygrail' => '', 'swallow' => '' }
@@ -1889,10 +1848,10 @@ endif::holygrail+swallow[]
       end
 
       test 'ifdef with missing required attributes does not include content' do
-        input = <<-EOS
-ifdef::holygrail+swallow[]
-Our quest is complete!
-endif::holygrail+swallow[]
+        input = <<~'EOS'
+        ifdef::holygrail+swallow[]
+        Our quest is complete!
+        endif::holygrail+swallow[]
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'holygrail' => '' }
@@ -1913,20 +1872,20 @@ endif::holygrail+swallow[]
           'asciidoctor,,asciidoctor-version' => 'content',
           'asciidoctor++asciidoctor-version' => '',
         }.each do |condition, expected|
-          input = <<-EOS
-ifdef::#{condition}[]
-content
-endif::[]
+          input = <<~EOS
+          ifdef::#{condition}[]
+          content
+          endif::[]
           EOS
           assert_equal expected, (document_from_string input, parse: false).reader.read
         end
       end
 
       test 'ifndef with undefined attribute includes block' do
-        input = <<-EOS
-ifndef::holygrail[]
-Our quest continues to find the holy grail!
-endif::holygrail[]
+        input = <<~'EOS'
+        ifndef::holygrail[]
+        Our quest continues to find the holy grail!
+        endif::holygrail[]
         EOS
 
         doc = Asciidoctor::Document.new input
@@ -1939,10 +1898,10 @@ endif::holygrail[]
       end
 
       test 'ifndef with one alternative attribute set does not include content' do
-        input = <<-EOS
-ifndef::holygrail,swallow[]
-Our quest is complete!
-endif::holygrail,swallow[]
+        input = <<~'EOS'
+        ifndef::holygrail,swallow[]
+        Our quest is complete!
+        endif::holygrail,swallow[]
         EOS
 
         result = (Asciidoctor::Document.new input, attributes: { 'swallow' => '' }).reader.read
@@ -1950,10 +1909,10 @@ endif::holygrail,swallow[]
       end
 
       test 'ifndef with both alternative attributes set does not include content' do
-        input = <<-EOS
-ifndef::holygrail,swallow[]
-Our quest is complete!
-endif::holygrail,swallow[]
+        input = <<~'EOS'
+        ifndef::holygrail,swallow[]
+        Our quest is complete!
+        endif::holygrail,swallow[]
         EOS
 
         result = (Asciidoctor::Document.new input, attributes: { 'swallow' => '', 'holygrail' => '' }).reader.read
@@ -1961,10 +1920,10 @@ endif::holygrail,swallow[]
       end
 
       test 'ifndef with no alternative attributes set includes content' do
-        input = <<-EOS
-ifndef::holygrail,swallow[]
-Our quest is complete!
-endif::holygrail,swallow[]
+        input = <<~'EOS'
+        ifndef::holygrail,swallow[]
+        Our quest is complete!
+        endif::holygrail,swallow[]
         EOS
 
         result = (Asciidoctor::Document.new input).reader.read
@@ -1972,10 +1931,10 @@ endif::holygrail,swallow[]
       end
 
       test 'ifndef with no required attributes set includes content' do
-        input = <<-EOS
-ifndef::holygrail+swallow[]
-Our quest is complete!
-endif::holygrail+swallow[]
+        input = <<~'EOS'
+        ifndef::holygrail+swallow[]
+        Our quest is complete!
+        endif::holygrail+swallow[]
         EOS
 
         result = (Asciidoctor::Document.new input).reader.read
@@ -1983,10 +1942,10 @@ endif::holygrail+swallow[]
       end
 
       test 'ifndef with all required attributes set does not include content' do
-        input = <<-EOS
-ifndef::holygrail+swallow[]
-Our quest is complete!
-endif::holygrail+swallow[]
+        input = <<~'EOS'
+        ifndef::holygrail+swallow[]
+        Our quest is complete!
+        endif::holygrail+swallow[]
         EOS
 
         result = (Asciidoctor::Document.new input, attributes: { 'swallow' => '', 'holygrail' => '' }).reader.read
@@ -1994,10 +1953,10 @@ endif::holygrail+swallow[]
       end
 
       test 'ifndef with at least one required attributes set does not include content' do
-        input = <<-EOS
-ifndef::holygrail+swallow[]
-Our quest is complete!
-endif::holygrail+swallow[]
+        input = <<~'EOS'
+        ifndef::holygrail+swallow[]
+        Our quest is complete!
+        endif::holygrail+swallow[]
         EOS
 
         result = (Asciidoctor::Document.new input, attributes: { 'swallow' => '' }).reader.read
@@ -2005,10 +1964,10 @@ endif::holygrail+swallow[]
       end
 
       test 'escaped ifdef is unescaped and ignored' do
-        input = <<-EOS
-\\ifdef::holygrail[]
-content
-\\endif::holygrail[]
+        input = <<~'EOS'
+        \ifdef::holygrail[]
+        content
+        \endif::holygrail[]
         EOS
 
         doc = Asciidoctor::Document.new input
@@ -2021,10 +1980,10 @@ content
       end
 
       test 'ifeval comparing missing attribute to nil includes content' do
-        input = <<-EOS
-ifeval::['{foo}' == '']
-No foo for you!
-endif::[]
+        input = <<~'EOS'
+        ifeval::['{foo}' == '']
+        No foo for you!
+        endif::[]
         EOS
 
         doc = Asciidoctor::Document.new input
@@ -2037,10 +1996,10 @@ endif::[]
       end
 
       test 'ifeval comparing missing attribute to 0 drops content' do
-        input = <<-EOS
-ifeval::[{leveloffset} == 0]
-I didn't make the cut!
-endif::[]
+        input = <<~'EOS'
+        ifeval::[{leveloffset} == 0]
+        I didn't make the cut!
+        endif::[]
         EOS
 
         doc = Asciidoctor::Document.new input
@@ -2053,10 +2012,10 @@ endif::[]
       end
 
       test 'ifeval comparing double-quoted attribute to matching string includes content' do
-        input = <<-EOS
-ifeval::["{gem}" == "asciidoctor"]
-Asciidoctor it is!
-endif::[]
+        input = <<~'EOS'
+        ifeval::["{gem}" == "asciidoctor"]
+        Asciidoctor it is!
+        endif::[]
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'gem' => 'asciidoctor' }
@@ -2069,10 +2028,10 @@ endif::[]
       end
 
       test 'ifeval comparing single-quoted attribute to matching string includes content' do
-        input = <<-EOS
-ifeval::['{gem}' == 'asciidoctor']
-Asciidoctor it is!
-endif::[]
+        input = <<~'EOS'
+        ifeval::['{gem}' == 'asciidoctor']
+        Asciidoctor it is!
+        endif::[]
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'gem' => 'asciidoctor' }
@@ -2085,10 +2044,10 @@ endif::[]
       end
 
       test 'ifeval comparing quoted attribute to non-matching string drops content' do
-        input = <<-EOS
-ifeval::['{gem}' == 'asciidoctor']
-Asciidoctor it is!
-endif::[]
+        input = <<~'EOS'
+        ifeval::['{gem}' == 'asciidoctor']
+        Asciidoctor it is!
+        endif::[]
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'gem' => 'tilt' }
@@ -2101,10 +2060,10 @@ endif::[]
       end
 
       test 'ifeval comparing attribute to lower version number includes content' do
-        input = <<-EOS
-ifeval::['{asciidoctor-version}' >= '0.1.0']
-That version will do!
-endif::[]
+        input = <<~'EOS'
+        ifeval::['{asciidoctor-version}' >= '0.1.0']
+        That version will do!
+        endif::[]
         EOS
 
         doc = Asciidoctor::Document.new input
@@ -2117,10 +2076,10 @@ endif::[]
       end
 
       test 'ifeval comparing attribute to self includes content' do
-        input = <<-EOS
-ifeval::['{asciidoctor-version}' == '{asciidoctor-version}']
-Of course it's the same!
-endif::[]
+        input = <<~'EOS'
+        ifeval::['{asciidoctor-version}' == '{asciidoctor-version}']
+        Of course it's the same!
+        endif::[]
         EOS
 
         doc = Asciidoctor::Document.new input
@@ -2133,10 +2092,10 @@ endif::[]
       end
 
       test 'ifeval arguments can be transposed' do
-        input = <<-EOS
-ifeval::['0.1.0' <= '{asciidoctor-version}']
-That version will do!
-endif::[]
+        input = <<~'EOS'
+        ifeval::['0.1.0' <= '{asciidoctor-version}']
+        That version will do!
+        endif::[]
         EOS
 
         doc = Asciidoctor::Document.new input
@@ -2149,10 +2108,10 @@ endif::[]
       end
 
       test 'ifeval matching numeric equality includes content' do
-        input = <<-EOS
-ifeval::[{rings} == 1]
-One ring to rule them all!
-endif::[]
+        input = <<~'EOS'
+        ifeval::[{rings} == 1]
+        One ring to rule them all!
+        endif::[]
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'rings' => '1' }
@@ -2165,10 +2124,10 @@ endif::[]
       end
 
       test 'ifeval matching numeric inequality includes content' do
-        input = <<-EOS
-ifeval::[{rings} != 0]
-One ring to rule them all!
-endif::[]
+        input = <<~'EOS'
+        ifeval::[{rings} != 0]
+        One ring to rule them all!
+        endif::[]
         EOS
 
         doc = Asciidoctor::Document.new input, attributes: { 'rings' => '1' }
@@ -2181,9 +2140,9 @@ endif::[]
       end
 
       test 'ifdef with no target is ignored' do
-        input = <<-EOS
-ifdef::[]
-content
+        input = <<~'EOS'
+        ifdef::[]
+        content
         EOS
 
         doc = Asciidoctor::Document.new input