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diff --git a/tests/typ/library/font.typ b/tests/typ/library/font.typ
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+// Test configuring font properties.
+
+#font("PT Sans", 10pt)
+
+// Set same font size in three different ways.
+#font(20pt)[A]
+#font(200%)[A]
+#font(15pt + 50%)[A]
+
+// Do nothing.
+#font[Normal]
+
+// Set style (is available).
+#font(style: italic)[Italic]
+
+// Set weight (is available).
+#font(weight: bold)[Bold]
+
+// Set stretch (not available, matching closest).
+#font(stretch: ultra-condensed)[Condensed]
+
+// Error: 7-12 unexpected argument
+#font(false)
+
+// Error: 3:14-3:18 expected font style, found font weight
+// Error: 2:28-2:34 expected font weight, found string
+// Error: 1:43-1:44 expected font family or array of font families, found integer
+#font(style: bold, weight: "thin", serif: 0)
+
+// Warning: 15-19 should be between 100 and 900
+#font(weight: 2700)
+
+// Error: 7-27 unexpected argument
+#font(something: "invalid")
+
+---
+// Test font fallback and class definitions.
+
+// Source Sans Pro + Segoe UI Emoji.
+Emoji: 🏀
+
+// CMU Serif + Noto Emoji.
+#font("CMU Serif", "Noto Emoji")[
+    Emoji: 🏀
+]
+
+// Class definitions.
+#font(serif: ("CMU Serif", "Latin Modern Math", "Noto Emoji"))
+#font(serif)[
+    Math: ∫ α + β ➗ 3
+]
+
+// Class definition reused.
+#font(sans-serif: "Noto Emoji")
+#font(sans-serif: ("Archivo", sans-serif))
+New sans-serif. 🚀