From 2d8e5255f3369bf00c55c42d92248b411c4e18d7 Mon Sep 17 00:00:00 2001
From: Khaled Hosny <khaled@aliftype.com>
Date: Sun, 6 Apr 2025 02:22:43 +0200
Subject: [PATCH] [test/ot-math] Add a test for the Cambria Math workaround

---
 .../fonts/MathTestFontPretendToBeCambria.ttf    | Bin 0 -> 26440 bytes
 test/api/test-ot-math.c                         |  11 +++++++++++
 2 files changed, 11 insertions(+)
 create mode 100644 test/api/fonts/MathTestFontPretendToBeCambria.ttf

diff --git a/test/api/fonts/MathTestFontPretendToBeCambria.ttf b/test/api/fonts/MathTestFontPretendToBeCambria.ttf
new file mode 100644
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diff --git a/test/api/test-ot-math.c b/test/api/test-ot-math.c
index 1510d2f4e..14854cce0 100644
--- a/test/api/test-ot-math.c
+++ b/test/api/test-ot-math.c
@@ -180,6 +180,17 @@ test_get_constant (void)
   g_assert_cmpint((hb_ot_math_get_constant (hb_font, HB_OT_MATH_CONSTANT_RADICAL_DEGREE_BOTTOM_RAISE_PERCENT)), ==, 65);
   closeFont();
 
+  /* https://github.com/harfbuzz/harfbuzz/pull/5250
+   * The test font pretends to be Cambria Math for the purpose of
+   * MATH->is_bad_cambria() by having displayOperatorMinHeight set to 2500 and 
+   * delimitedSubFormulaMinHeight set to 3000, and the MATH table padded with
+   * zeros to be exactly 25722 bytes. When we detect this, we swap the values
+   * of the two constants. */
+  openFont("fonts/MathTestFontPretendToBeCambria.ttf");
+  g_assert_cmpint((hb_ot_math_get_constant (hb_font, HB_OT_MATH_CONSTANT_DISPLAY_OPERATOR_MIN_HEIGHT)), ==, 3000);
+  g_assert_cmpint((hb_ot_math_get_constant (hb_font, HB_OT_MATH_CONSTANT_DELIMITED_SUB_FORMULA_MIN_HEIGHT)), ==, 2500);
+  closeFont();
+
   cleanupFreeType();
 }