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diff --git a/tests/suite/layout/stack.typ b/tests/suite/layout/stack.typ
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+// Test stack layouts.
+
+--- stack-basic ---
+// Test stacks with different directions.
+#let widths = (
+  30pt, 20pt, 40pt, 15pt,
+  30pt, 50%, 20pt, 100%,
+)
+
+#let shaded(i, w) = {
+  let v = (i + 1) * 10%
+  rect(width: w, height: 10pt, fill: rgb(v, v, v))
+}
+
+#let items = for (i, w) in widths.enumerate() {
+  (align(right, shaded(i, w)),)
+}
+
+#set page(width: 50pt, margin: 0pt)
+#stack(dir: btt, ..items)
+
+--- stack-spacing ---
+// Test spacing.
+#set page(width: 50pt, margin: 0pt)
+
+#let x = square(size: 10pt, fill: eastern)
+#stack(
+  spacing: 5pt,
+  stack(dir: rtl, spacing: 5pt, x, x, x),
+  stack(dir: ltr, x, 20%, x, 20%, x),
+  stack(dir: ltr, spacing: 5pt, x, x, 7pt, 3pt, x),
+)
+
+--- stack-overflow ---
+// Test overflow.
+#set page(width: 50pt, height: 30pt, margin: 0pt)
+#box(stack(
+  rect(width: 40pt, height: 20pt, fill: conifer),
+  rect(width: 30pt, height: 13pt, fill: forest),
+))
+
+--- stack-fr ---
+#set page(height: 3.5cm)
+#stack(
+  dir: ltr,
+  spacing: 1fr,
+  ..for c in "ABCDEFGHI" {([#c],)}
+)
+
+Hello
+#v(2fr)
+from #h(1fr) the #h(1fr) wonderful
+#v(1fr)
+World! 🌍
+
+--- stack-rtl-align-and-fr ---
+// Test aligning things in RTL stack with align function & fr units.
+#set page(width: 50pt, margin: 5pt)
+#set block(spacing: 5pt)
+#set text(8pt)
+#stack(dir: rtl, 1fr, [A], 1fr, [B], [C])
+#stack(dir: rtl,
+  align(center, [A]),
+  align(left, [B]),
+  [C],
+)
+
+--- issue-1240-stack-h-fr ---
+// This issue is sort of horrible: When you write `h(1fr)` in a `stack` instead
+// of directly `1fr`, things go awry. To fix this, we now transparently detect
+// h/v children.
+#stack(dir: ltr, [a], 1fr, [b], 1fr, [c])
+#stack(dir: ltr, [a], h(1fr), [b], h(1fr), [c])
+
+--- issue-1240-stack-v-fr ---
+#set page(height: 60pt)
+#stack(
+  dir: ltr,
+  spacing: 1fr,
+  stack([a], 1fr, [b]),
+  stack([a], v(1fr), [b]),
+)