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diff --git a/tests/suite/scripting/if.typ b/tests/suite/scripting/if.typ
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+// Test if-else expressions.
+
+--- if-markup ---
+// Test condition evaluation.
+#if 1 < 2 [
+  One.
+]
+
+#if true == false [
+  {Bad}, but we {dont-care}!
+]
+
+--- if-condition-complex ---
+// Braced condition.
+#if {true} [
+  One.
+]
+
+// Content block in condition.
+#if [] != none [
+  Two.
+]
+
+// Multi-line condition with parens.
+#if (
+  1 + 1
+    == 1
+) [
+  Nope.
+] else {
+  "Three."
+}
+
+// Multiline.
+#if false [
+  Bad.
+] else {
+  let point = "."
+  "Four" + point
+}
+
+// Content block can be argument or body depending on whitespace.
+#{
+  if content == type[b] [Fi] else [Nope]
+  if content == type [Nope] else [ve.]
+}
+
+#let i = 3
+#if i < 2 [
+  Five.
+] else if i < 4 [
+  Six.
+] else [
+  Seven.
+]
+
+--- if-else-if-else ---
+// Test else if.
+
+#let nth(n) = {
+  str(n)
+  if n == 1 { "st" }
+  else if n == 2 { "nd" }
+  else if n == 3 { "rd" }
+  else { "th" }
+}
+
+#test(nth(1), "1st")
+#test(nth(2), "2nd")
+#test(nth(3), "3rd")
+#test(nth(4), "4th")
+#test(nth(5), "5th")
+
+--- if-expression ---
+// Value of if expressions.
+
+#{
+  let x = 1
+  let y = 2
+  let z
+
+  // Returns if branch.
+  z = if x < y { "ok" }
+  test(z, "ok")
+
+  // Returns else branch.
+  z = if x > y { "bad" } else { "ok" }
+  test(z, "ok")
+
+  // Missing else evaluates to none.
+  z = if x > y { "bad" }
+  test(z, none)
+}
+
+--- if-condition-string-invalid ---
+// Condition must be boolean.
+// If it isn't, neither branch is evaluated.
+// Error: 5-14 expected boolean, found string
+#if "a" + "b" { nope } else { nope }
+
+--- if-condition-invalid-and-wrong-type ---
+// Make sure that we don't complain twice.
+// Error: 5-12 cannot add integer and string
+#if 1 + "2" {}
+
+--- if-incomplete ---
+// Error: 4 expected expression
+#if
+
+// Error: 5 expected expression
+#{if}
+
+// Error: 6 expected block
+#if x
+
+// Error: 2-6 unexpected keyword `else`
+#else {}
+
+// Should output `x`.
+// Error: 4 expected expression
+#if
+x {}
+
+// Should output `something`.
+// Error: 6 expected block
+#if x something
+
+// Should output `A thing.`
+// Error: 19 expected block
+A#if false {} else thing
+
+#if a []else [b]
+#if a [] else [b]
+#if a {} else [b]