tests: add unit tests for Math transform utilities (#13935)

1 files changed, 73 insertions, 0 deletions

diff --git a/tests/helpers/MathTransform.cpp b/tests/helpers/MathTransform.cpp
new file mode 100644
index 00000000..686721b9
--- /dev/null
+++ b/tests/helpers/MathTransform.cpp
@@ -0,0 +1,73 @@
+#include <helpers/math/Math.hpp>
+
+#include <gtest/gtest.h>
+
+using namespace Math;
+
+// wlTransformToHyprutils
+
+TEST(Helpers, mathWlTransformToHyprutils) {
+    EXPECT_EQ(wlTransformToHyprutils(WL_OUTPUT_TRANSFORM_NORMAL), eTransform::HYPRUTILS_TRANSFORM_NORMAL);
+    EXPECT_EQ(wlTransformToHyprutils(WL_OUTPUT_TRANSFORM_90), eTransform::HYPRUTILS_TRANSFORM_90);
+    EXPECT_EQ(wlTransformToHyprutils(WL_OUTPUT_TRANSFORM_180), eTransform::HYPRUTILS_TRANSFORM_180);
+    EXPECT_EQ(wlTransformToHyprutils(WL_OUTPUT_TRANSFORM_270), eTransform::HYPRUTILS_TRANSFORM_270);
+    EXPECT_EQ(wlTransformToHyprutils(WL_OUTPUT_TRANSFORM_FLIPPED), eTransform::HYPRUTILS_TRANSFORM_FLIPPED);
+    EXPECT_EQ(wlTransformToHyprutils(WL_OUTPUT_TRANSFORM_FLIPPED_90), eTransform::HYPRUTILS_TRANSFORM_FLIPPED_90);
+    EXPECT_EQ(wlTransformToHyprutils(WL_OUTPUT_TRANSFORM_FLIPPED_180), eTransform::HYPRUTILS_TRANSFORM_FLIPPED_180);
+    EXPECT_EQ(wlTransformToHyprutils(WL_OUTPUT_TRANSFORM_FLIPPED_270), eTransform::HYPRUTILS_TRANSFORM_FLIPPED_270);
+}
+
+TEST(Helpers, mathWlTransformToHyprutilsInvalid) {
+    // Invalid value falls back to NORMAL
+    EXPECT_EQ(wlTransformToHyprutils(static_cast<wl_output_transform>(99)), eTransform::HYPRUTILS_TRANSFORM_NORMAL);
+}
+
+// invertTransform
+
+TEST(Helpers, mathInvertTransformNonRotated) {
+    // Non-rotated transforms are their own inverse
+    EXPECT_EQ(invertTransform(WL_OUTPUT_TRANSFORM_NORMAL), WL_OUTPUT_TRANSFORM_NORMAL);
+    EXPECT_EQ(invertTransform(WL_OUTPUT_TRANSFORM_180), WL_OUTPUT_TRANSFORM_180);
+    EXPECT_EQ(invertTransform(WL_OUTPUT_TRANSFORM_FLIPPED), WL_OUTPUT_TRANSFORM_FLIPPED);
+    EXPECT_EQ(invertTransform(WL_OUTPUT_TRANSFORM_FLIPPED_180), WL_OUTPUT_TRANSFORM_FLIPPED_180);
+}
+
+TEST(Helpers, mathInvertTransformRotated) {
+    // 90 and 270 swap when inverted (non-flipped)
+    EXPECT_EQ(invertTransform(WL_OUTPUT_TRANSFORM_90), WL_OUTPUT_TRANSFORM_270);
+    EXPECT_EQ(invertTransform(WL_OUTPUT_TRANSFORM_270), WL_OUTPUT_TRANSFORM_90);
+}
+
+TEST(Helpers, mathInvertTransformFlippedRotated) {
+    // Flipped rotations: flipped bit stays, 90/270 don't swap
+    EXPECT_EQ(invertTransform(WL_OUTPUT_TRANSFORM_FLIPPED_90), WL_OUTPUT_TRANSFORM_FLIPPED_90);
+    EXPECT_EQ(invertTransform(WL_OUTPUT_TRANSFORM_FLIPPED_270), WL_OUTPUT_TRANSFORM_FLIPPED_270);
+}
+
+TEST(Helpers, mathInvertTransformDoubleInvert) {
+    // Double invert returns original for all transforms
+    for (int i = 0; i <= 7; i++) {
+        auto t = static_cast<wl_output_transform>(i);
+        EXPECT_EQ(invertTransform(invertTransform(t)), t);
+    }
+}
+
+// composeTransform
+
+TEST(Helpers, mathComposeTransformIdentity) {
+    // Composing with NORMAL is identity
+    for (int i = 0; i <= 7; i++) {
+        auto t = static_cast<eTransform>(i);
+        EXPECT_EQ(composeTransform(t, eTransform::HYPRUTILS_TRANSFORM_NORMAL), t);
+        EXPECT_EQ(composeTransform(eTransform::HYPRUTILS_TRANSFORM_NORMAL, t), t);
+    }
+}
+
+TEST(Helpers, mathComposeTransformRotation) {
+    // 90 + 90 = 180
+    EXPECT_EQ(composeTransform(eTransform::HYPRUTILS_TRANSFORM_90, eTransform::HYPRUTILS_TRANSFORM_90), eTransform::HYPRUTILS_TRANSFORM_180);
+    // 90 + 180 = 270
+    EXPECT_EQ(composeTransform(eTransform::HYPRUTILS_TRANSFORM_90, eTransform::HYPRUTILS_TRANSFORM_180), eTransform::HYPRUTILS_TRANSFORM_270);
+    // 180 + 180 = NORMAL (360)
+    EXPECT_EQ(composeTransform(eTransform::HYPRUTILS_TRANSFORM_180, eTransform::HYPRUTILS_TRANSFORM_180), eTransform::HYPRUTILS_TRANSFORM_NORMAL);
+}