Add vertical alignment to equation number [Better Equation Numbering Pt.3] (#3482)

1 files changed, 49 insertions, 0 deletions

diff --git a/tests/typ/math/equation-number.typ b/tests/typ/math/equation-number.typ
index aefa308a..3de611b3 100644
--- a/tests/typ/math/equation-number.typ
+++ b/tests/typ/math/equation-number.typ
@@ -94,3 +94,52 @@ $ a + b = c $
 ---
 // Error: 52-58 expected `start`, `left`, `right`, or `end`, found center
 #set math.equation(numbering: "(1)", number-align: center)
+
+---
+// Error: 52-67 expected `start`, `left`, `right`, or `end`, found center
+#set math.equation(numbering: "(1)", number-align: center + bottom)
+
+---
+#set math.equation(numbering: "(1)")
+
+$ p &= ln a b \
+    &= ln a + ln b $
+
+---
+#set math.equation(numbering: "(1)", number-align: top+start)
+
+$ p &= ln a b \
+    &= ln a + ln b $
+
+---
+#show math.equation: set align(left)
+#set math.equation(numbering: "(1)", number-align: bottom)
+
+$ q &= ln sqrt(a b) \
+    &= 1/2 (ln a + ln b) $
+
+---
+// Tests that if the numbering's layout box vertically exceeds the box of
+// the equation frame's boundary, the latter's frame is resized correctly
+// to encompass the numbering. #box() below delineates the resized frame.
+//
+// A row with "-" only has a height that's smaller than the height of the
+// numbering's layout box. Note we use pattern "1" here, not "(1)", since
+// the parenthesis exceeds the numbering's layout box, due to the default
+// settings of top-edge and bottom-edge of the TextElem that laid it out.
+#set math.equation(numbering: "1", number-align: top)
+#box(
+$ - &- - \
+  a &= b $,
+fill: silver)
+
+#set math.equation(numbering: "1", number-align: horizon)
+#box(
+$ - - - $,
+fill: silver)
+
+#set math.equation(numbering: "1", number-align: bottom)
+#box(
+$ a &= b \
+  - &- - $,
+fill: silver)