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+// Test lines.
+
+--- stroke-constructor ---
+// Converting to stroke
+#assert.eq(stroke(red).paint, red)
+#assert.eq(stroke(red).thickness, auto)
+#assert.eq(stroke(2pt).paint, auto)
+#assert.eq(stroke((cap: "round", paint: blue)).cap, "round")
+#assert.eq(stroke((cap: auto, paint: blue)).cap, auto)
+#assert.eq(stroke((cap: auto, paint: blue)).thickness, auto)
+
+// Constructing with named arguments
+#assert.eq(stroke(paint: blue, thickness: 8pt), 8pt + blue)
+#assert.eq(stroke(thickness: 2pt), stroke(2pt))
+#assert.eq(stroke(cap: "round").thickness, auto)
+#assert.eq(stroke(cap: "round", thickness: auto).thickness, auto)
+
+--- stroke-constructor-unknown-key ---
+// Error: 9-21 unexpected key "foo", valid keys are "paint", "thickness", "cap", "join", "dash", and "miter-limit"
+#stroke((foo: "bar"))
+
+--- stroke-fields-simple ---
+// Test stroke fields for simple strokes.
+#test((1em + blue).paint, blue)
+#test((1em + blue).thickness, 1em)
+#test((1em + blue).cap, auto)
+#test((1em + blue).join, auto)
+#test((1em + blue).dash, auto)
+#test((1em + blue).miter-limit, auto)
+
+--- stroke-fields-complex ---
+// Test complex stroke fields.
+#let r1 = rect(stroke: (paint: cmyk(1%, 2%, 3%, 4%), thickness: 4em + 2pt, cap: "round", join: "bevel", miter-limit: 5.0, dash: none))
+#let r2 = rect(stroke: (paint: cmyk(1%, 2%, 3%, 4%), thickness: 4em + 2pt, cap: "round", join: "bevel", miter-limit: 5.0, dash: (3pt, "dot", 4em)))
+#let r3 = rect(stroke: (paint: cmyk(1%, 2%, 3%, 4%), thickness: 4em + 2pt, cap: "round", join: "bevel", dash: (array: (3pt, "dot", 4em), phase: 5em)))
+#let s1 = r1.stroke
+#let s2 = r2.stroke
+#let s3 = r3.stroke
+#test(s1.paint, cmyk(1%, 2%, 3%, 4%))
+#test(s1.thickness, 4em + 2pt)
+#test(s1.cap, "round")
+#test(s1.join, "bevel")
+#test(s1.miter-limit, 5.0)
+#test(s3.miter-limit, auto)
+#test(s1.dash, none)
+#test(s2.dash, (array: (3pt, "dot", 4em), phase: 0pt))
+#test(s3.dash, (array: (3pt, "dot", 4em), phase: 5em))
+
+--- stroke-zero-thickness ---
+// 0pt strokes must function exactly like 'none' strokes and not draw anything
+#rect(width: 10pt, height: 10pt, stroke: none)
+#rect(width: 10pt, height: 10pt, stroke: 0pt)
+#rect(width: 10pt, height: 10pt, stroke: none, fill: blue)
+#rect(width: 10pt, height: 10pt, stroke: 0pt + red, fill: blue)
+
+#line(length: 30pt, stroke: 0pt)
+#line(length: 30pt, stroke: (paint: red, thickness: 0pt, dash: ("dot", 1pt)))
+
+#table(columns: 2, stroke: none)[A][B]
+#table(columns: 2, stroke: 0pt)[A][B]
+
+#path(
+  fill: red,
+  stroke: none,
+  closed: true,
+  ((0%, 0%), (4%, -4%)),
+  ((50%, 50%), (4%, -4%)),
+  ((0%, 50%), (4%, 4%)),
+  ((50%, 0%), (4%, 4%)),
+)
+
+#path(
+  fill: red,
+  stroke: 0pt,
+  closed: true,
+  ((0%, 0%), (4%, -4%)),
+  ((50%, 50%), (4%, -4%)),
+  ((0%, 50%), (4%, 4%)),
+  ((50%, 0%), (4%, 4%)),
+)
+
+--- stroke-text ---
+#set text(size: 20pt)
+#set page(width: auto)
+#let v = [测试字体Test]
+
+#text(stroke: 0.3pt + red, v)
+
+#text(stroke: 0.7pt + red, v)
+
+#text(stroke: 7pt + red, v)
+
+#text(stroke: (paint: blue, thickness: 1pt, dash: "dashed"), v)
+
+#text(stroke: 1pt + gradient.linear(..color.map.rainbow), v)
+
+--- stroke-folding ---
+// Test stroke folding.
+#let sq(..args) = box(square(size: 10pt, ..args))
+
+#set square(stroke: none)
+#sq()
+#set square(stroke: auto)
+#sq()
+#sq(fill: teal)
+#sq(stroke: 2pt)
+#sq(stroke: blue)
+#sq(fill: teal, stroke: blue)
+#sq(fill: teal, stroke: 2pt + blue)
+
+--- stroke-composition ---
+// Test stroke composition.
+#set square(stroke: 4pt)
+#set text(font: "Roboto")
+#stack(
+  dir: ltr,
+  square(
+    stroke: (left: red, top: yellow, right: green, bottom: blue),
+    radius: 50%, align(center+horizon)[*G*],
+    inset: 8pt
+  ),
+  h(0.5cm),
+  square(
+    stroke: (left: red, top: yellow + 8pt, right: green, bottom: blue + 2pt),
+    radius: 50%, align(center+horizon)[*G*],
+    inset: 8pt
+  ),
+  h(0.5cm),
+  square(
+    stroke: (left: red, top: yellow, right: green, bottom: blue),
+    radius: 100%, align(center+horizon)[*G*],
+    inset: 8pt
+  ),
+)
+
+// Join between different solid strokes
+#set square(size: 20pt, stroke: 2pt)
+#set square(stroke: (left: green + 4pt, top: black + 2pt, right: blue, bottom: black + 2pt))
+#stack(
+  dir: ltr,
+  square(),
+  h(0.2cm),
+  square(radius: (top-left: 0pt, rest: 1pt)),
+  h(0.2cm),
+  square(radius: (top-left: 0pt, rest: 8pt)),
+  h(0.2cm),
+	square(radius: (top-left: 0pt, rest: 100pt)),
+)
+
+// Join between solid and dotted strokes
+#set square(stroke: (left: green + 4pt, top: black + 2pt, right: (paint: blue, dash: "dotted"), bottom: (paint: black, dash: "dotted")))
+#stack(
+  dir: ltr,
+  square(),
+  h(0.2cm),
+  square(radius: (top-left: 0pt, rest: 1pt)),
+  h(0.2cm),
+  square(radius: (top-left: 0pt, rest: 8pt)),
+  h(0.2cm),
+	square(radius: (top-left: 0pt, rest: 100pt)),
+)
+
+--- issue-3700-deformed-stroke ---
+// Test shape fill & stroke for specific values that used to make the stroke
+// deformed.
+#rect(
+  radius: 1mm,
+  width: 100%,
+  height: 10pt,
+  stroke: (left: rgb("46b3c2") + 16.0mm),
+)