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diff --git a/tests/ref/utility/strings.png b/tests/ref/utility/strings.png
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diff --git a/tests/typ/utility/strings.typ b/tests/typ/utility/strings.typ
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+// Test string functions.
+
+---
+// Test the `upper`, `lower`, and number formatting functions. 
+#upper("Abc 8 def")
+
+#lower("SCREAMING MUST BE SILENCED in " + roman(1672) + " years")
+
+#for i in range(9) {
+    symbol(i)
+    [ and ]
+    roman(i)
+    [ for #i]
+    parbreak()
+}
+
+---
+// Error: 8-15 cannot convert integers greater than 3,999,999 to roman numerals
+#roman(8000000)
+
+---
+// Error: 9-11 number must not be negative
+#symbol(-1)