resolves #3519 compute highlight line ranges on source block relative to value of start attribute (PR #3701)

1 files changed, 69 insertions, 0 deletions

diff --git a/test/syntax_highlighter_test.rb b/test/syntax_highlighter_test.rb
index e1d2702e..d771564c 100644
--- a/test/syntax_highlighter_test.rb
+++ b/test/syntax_highlighter_test.rb
@@ -903,6 +903,75 @@ context 'Syntax Highlighter' do
       end
     end
 
+    test 'should line highlight specified lines relative to start value' do
+      input = <<~EOS
+        :source-highlighter: rouge
+
+        [source%linenums,ruby,start=5,highlight=6]
+        ----
+        get {
+          render "Hello, World!"
+        }
+        ----
+      EOS
+
+      expected = <<~EOS.chop
+        <span class="n">get</span> <span class="p">{</span>
+        <span class="hll">  <span class="n">render</span> <span class="s2">"Hello, World!"</span>
+        </span><span class="p">}</span>
+        </pre>
+      EOS
+
+      output = convert_string_to_embedded input, safe: :safe
+      assert_includes output, expected
+    end
+
+    test 'should ignore start attribute when the value is 0' do
+      input = <<~EOS
+        :source-highlighter: rouge
+
+        [source%linenums,ruby,start=0,highlight=6]
+        ----
+        get {
+          render "Hello, World!"
+        }
+        ----
+      EOS
+
+      expected = <<~EOS.chop
+        <span class="n">get</span> <span class="p">{</span>
+          <span class="n">render</span> <span class="s2">"Hello, World!"</span>
+        <span class="p">}</span>
+        </pre>
+      EOS
+
+      output = convert_string_to_embedded input, safe: :safe
+      assert_includes output, expected
+    end
+
+    test 'should not line highlight when the start attribute is greater than highlight' do
+      input = <<~EOS
+        :source-highlighter: rouge
+
+        [source%linenums,ruby,start=7,highlight=6]
+        ----
+        get {
+          render "Hello, World!"
+        }
+        ----
+      EOS
+
+      expected = <<~EOS.chop
+        <span class="n">get</span> <span class="p">{</span>
+          <span class="n">render</span> <span class="s2">"Hello, World!"</span>
+        <span class="p">}</span>
+        </pre>
+      EOS
+
+      output = convert_string_to_embedded input, safe: :safe
+      assert_includes output, expected
+    end
+
     test 'should restore callout marks to correct lines if line numbering and line highlighting are enabled' do
       [1, 2].each do |highlight|
         input = <<~EOS