Add `number-align` to `math.equation` [Better Equation Numbering Pt.2] (#3446)

2 files changed, 96 insertions, 0 deletions

diff --git a/tests/typ/math/block-alignment.typ b/tests/typ/math/equation-block-align.typ
index c6c9cd89..c6c9cd89 100644
--- a/tests/typ/math/block-alignment.typ
+++ b/tests/typ/math/equation-block-align.typ
diff --git a/tests/typ/math/equation-number.typ b/tests/typ/math/equation-number.typ
new file mode 100644
index 00000000..aefa308a
--- /dev/null
+++ b/tests/typ/math/equation-number.typ
@@ -0,0 +1,96 @@
+// Test equation number, and its interaction with equation
+// block's alignment and text direction.
+
+---
+#set math.equation(numbering: "(1)")
+
+$ a + b = c $
+
+#show math.equation: set align(center)
+$ a + b = c $
+#show math.equation: set align(left)
+$ a + b = c $
+#show math.equation: set align(right)
+$ a + b = c $
+
+#set text(dir: rtl)
+#show math.equation: set align(start)
+$ a + b = c $
+#show math.equation: set align(end)
+$ a + b = c $
+
+---
+#set math.equation(numbering: "(1)", number-align: start)
+
+$ a + b = c $
+
+#show math.equation: set align(center)
+$ a + b = c $
+#show math.equation: set align(left)
+$ a + b = c $
+#show math.equation: set align(right)
+$ a + b = c $
+
+#set text(dir: rtl)
+#show math.equation: set align(start)
+$ a + b = c $
+#show math.equation: set align(end)
+$ a + b = c $
+
+---
+#set math.equation(numbering: "(1)", number-align: end)
+
+$ a + b = c $
+
+#show math.equation: set align(center)
+$ a + b = c $
+#show math.equation: set align(left)
+$ a + b = c $
+#show math.equation: set align(right)
+$ a + b = c $
+
+#set text(dir: rtl)
+#show math.equation: set align(start)
+$ a + b = c $
+#show math.equation: set align(end)
+$ a + b = c $
+
+---
+#set math.equation(numbering: "(1)", number-align: left)
+
+$ a + b = c $
+
+#show math.equation: set align(center)
+$ a + b = c $
+#show math.equation: set align(left)
+$ a + b = c $
+#show math.equation: set align(right)
+$ a + b = c $
+
+#set text(dir: rtl)
+#show math.equation: set align(start)
+$ a + b = c $
+#show math.equation: set align(end)
+$ a + b = c $
+
+---
+#set math.equation(numbering: "(1)", number-align: right)
+
+$ a + b = c $
+
+#show math.equation: set align(center)
+$ a + b = c $
+#show math.equation: set align(left)
+$ a + b = c $
+#show math.equation: set align(right)
+$ a + b = c $
+
+#set text(dir: rtl)
+#show math.equation: set align(start)
+$ a + b = c $
+#show math.equation: set align(end)
+$ a + b = c $
+
+---
+// Error: 52-58 expected `start`, `left`, `right`, or `end`, found center
+#set math.equation(numbering: "(1)", number-align: center)