1 files changed, 37 insertions, 0 deletions
diff --git a/test/platform/MatrixTest.cpp b/test/platform/MatrixTest.cpp
new file mode 100644
index 00000000..3b8aab27
--- /dev/null
+++ b/test/platform/MatrixTest.cpp
@@ -0,0 +1,37 @@
+#include "cru/platform/GraphBase.hpp"
+#include "cru/platform/Matrix.hpp"
+
+#include <gtest/gtest.h>
+
+using cru::platform::Matrix;
+using cru::platform::Point;
+
+TEST(Matrix, Rotation) {
+  Point p(1, 1);
+
+  Point p90 = Matrix::Rotation(90).TransformPoint(p);
+  ASSERT_FLOAT_EQ(p90.x, -1);
+  ASSERT_FLOAT_EQ(p90.y, 1);
+
+  Point p180 = Matrix::Rotation(180).TransformPoint(p);
+  ASSERT_FLOAT_EQ(p180.x, -1);
+  ASSERT_FLOAT_EQ(p180.y, -1);
+
+  Point p270 = Matrix::Rotation(270).TransformPoint(p);
+  ASSERT_FLOAT_EQ(p270.x, 1);
+  ASSERT_FLOAT_EQ(p270.y, -1);
+}
+
+TEST(Matrix, TranslationAndRotation) {
+  Point p =
+      (Matrix::Translation(1, 1) * Matrix::Rotation(90)).TransformPoint({1, 1});
+  ASSERT_FLOAT_EQ(p.x, -2);
+  ASSERT_FLOAT_EQ(p.y, 2);
+}
+
+TEST(Matrix, RotationAndTranslation) {
+  Point p =
+      (Matrix::Rotation(90) * Matrix::Translation(1, 1)).TransformPoint({1, 1});
+  ASSERT_FLOAT_EQ(p.x, 0);
+  ASSERT_FLOAT_EQ(p.y, 2);
+}