Better test runner (#3922)

3 files changed, 159 insertions, 0 deletions

diff --git a/tests/suite/layout/flow/flow.typ b/tests/suite/layout/flow/flow.typ
new file mode 100644
index 00000000..9c48c9ac
--- /dev/null
+++ b/tests/suite/layout/flow/flow.typ
@@ -0,0 +1,67 @@
+--- flow-fr ---
+#set page(height: 2cm)
+#set text(white)
+#rect(fill: forest)[
+          #v(1fr)
+  #h(1fr) Hi you!
+]
+
+--- issue-flow-overlarge-frames ---
+// In this bug, the first line of the second paragraph was on its page alone an
+// the rest moved down. The reason was that the second block resulted in
+// overlarge frames because the region wasn't finished properly.
+#set page(height: 70pt)
+#block[This file tests a bug where an almost empty page occurs.]
+#block[
+  The text in this second block was torn apart and split up for
+  some reason beyond my knowledge.
+]
+
+--- issue-flow-trailing-leading ---
+// In this bug, the first part of the paragraph moved down to the second page
+// because trailing leading wasn't trimmed, resulting in an overlarge frame.
+#set page(height: 60pt)
+#v(19pt)
+#block[
+  But, soft! what light through yonder window breaks?
+  It is the east, and Juliet is the sun.
+]
+
+--- issue-flow-weak-spacing ---
+// In this bug, there was a bit of space below the heading because weak spacing
+// directly before a layout-induced column or page break wasn't trimmed.
+#set page(height: 60pt)
+#rect(inset: 0pt, columns(2)[
+  Text
+  #v(12pt)
+  Hi
+  #v(10pt, weak: true)
+  At column break.
+])
+
+--- issue-flow-frame-placement ---
+// In this bug, a frame intended for the second region ended up in the first.
+#set page(height: 105pt)
+#block(lorem(20))
+
+--- issue-flow-layout-index-out-of-bounds ---
+// This bug caused an index-out-of-bounds panic when layouting paragraphs needed
+// multiple reorderings.
+#set page(height: 200pt)
+#lorem(30)
+
+#figure(placement: auto, block(height: 100%))
+
+#lorem(10)
+
+#lorem(10)
+
+--- issue-3641-float-loop ---
+// Flow layout should terminate!
+//
+// This is not yet ideal: The heading should not move to the second page, but
+// that's a separate bug and not a regression.
+#set page(height: 40pt)
+
+= Heading
+#lorem(6)
diff --git a/tests/suite/layout/flow/invisibles.typ b/tests/suite/layout/flow/invisibles.typ
new file mode 100644
index 00000000..7e460373
--- /dev/null
+++ b/tests/suite/layout/flow/invisibles.typ
@@ -0,0 +1,61 @@
+// Test out-of-flow items (place, counter updates, etc.) at the
+// beginning of a block not creating a frame just for them.
+
+--- flow-first-region-no-item ---
+// No item in the first region.
+#set page(height: 5cm, margin: 1cm)
+No item in the first region.
+#block(breakable: true, stroke: 1pt, inset: 0.5cm)[
+  #rect(height: 2cm, fill: gray)
+]
+
+--- flow-first-region-counter-update ---
+// Counter update in the first region.
+#set page(height: 5cm, margin: 1cm)
+Counter update.
+#block(breakable: true, stroke: 1pt, inset: 0.5cm)[
+  #counter("dummy").step()
+  #rect(height: 2cm, fill: gray)
+]
+
+--- flow-first-region-placed ---
+// Placed item in the first region.
+#set page(height: 5cm, margin: 1cm)
+Placed item in the first region.
+#block(breakable: true, above: 1cm, stroke: 1pt, inset: 0.5cm)[
+  #place(dx: -0.5cm, dy: -0.75cm, box(width: 200%)[OOF])
+  #rect(height: 2cm, fill: gray)
+]
+
+--- flow-first-region-zero-sized-item ---
+// In-flow item with size zero in the first region.
+#set page(height: 5cm, margin: 1cm)
+In-flow, zero-sized item.
+#block(breakable: true, stroke: 1pt, inset: 0.5cm)[
+  #set block(spacing: 0pt)
+  #line(length: 0pt)
+  #rect(height: 2cm, fill: gray)
+  #line(length: 100%)
+]
+
+--- flow-first-region-counter-update-and-placed ---
+// Counter update and placed item in the first region.
+#set page(height: 5cm, margin: 1cm)
+Counter update + place.
+#block(breakable: true, above: 1cm, stroke: 1pt, inset: 0.5cm)[
+  #counter("dummy").step()
+  #place(dx: -0.5cm, dy: -0.75cm, box([OOF]))
+  #rect(height: 2cm, fill: gray)
+]
+
+--- flow-first-region-counter-update-placed-and-line ---
+// Mix-and-match all the previous ones.
+#set page(height: 5cm, margin: 1cm)
+Mix-and-match all the previous tests.
+#block(breakable: true, above: 1cm, stroke: 1pt, inset: 0.5cm)[
+  #counter("dummy").step()
+  #place(dx: -0.5cm, dy: -0.75cm, box(width: 200%)[OOF])
+  #line(length: 100%)
+  #place(dy: -0.8em)[OOF]
+  #rect(height: 2cm, fill: gray)
+]
diff --git a/tests/suite/layout/flow/orphan.typ b/tests/suite/layout/flow/orphan.typ
new file mode 100644
index 00000000..70eac731
--- /dev/null
+++ b/tests/suite/layout/flow/orphan.typ
@@ -0,0 +1,31 @@
+// Test that lines and headings doesn't become orphan.
+
+--- flow-heading-no-orphan ---
+#set page(height: 100pt)
+#lorem(12)
+
+= Introduction
+This is the start and it goes on.
+
+--- flow-par-no-orphan-and-widow-lines ---
+// LARGE
+#set page("a8", height: 140pt)
+#set text(weight: 700)
+
+// Fits fully onto the first page.
+#set text(blue)
+#lorem(27)
+
+// The first line would fit, but is moved to the second page.
+#lorem(20)
+
+// The second-to-last line is moved to the third page so that the last is isn't
+// as lonely.
+#set text(maroon)
+#lorem(11)
+
+#lorem(13)
+
+// All three lines go to the next page.
+#set text(olive)
+#lorem(10)