Add common-tests and rectangle class tests

src/common-tests/rectangle_tests.cpp

@@ -0,0 +1,83 @@
+#include "common/rectangle.h"
+#include <gtest/gtest.h>
+
+using Common::Rectangle;
+using IntRectangle = Rectangle<int>;
+
+TEST(Rectangle, DefaultConstructorIsInvalid)
+{
+  IntRectangle r;
+  ASSERT_FALSE(r.Valid());
+}
+
+TEST(Rectangle, AdjacentRectanglesNotIntersecting)
+{
+  IntRectangle r1(0, 0, 10, 10);
+  IntRectangle r2(10, 10, 20, 20);
+  ASSERT_FALSE(r1.Intersects(r2));
+}
+
+TEST(Rectangle, IntersectingRectanglesIntersecting)
+{
+  IntRectangle r1(0, 0, 10, 10);
+  IntRectangle r2(9, 9, 4, 4);
+  ASSERT_TRUE(r1.Intersects(r2));
+  ASSERT_TRUE(r2.Intersects(r1));
+}
+
+TEST(Rectangle, PointContainedInRectangle)
+{
+  IntRectangle r1(0, 0, 10, 10);
+  ASSERT_TRUE(r1.Contains(5, 5));
+}
+
+TEST(Rectangle, PointOutsideRectangleNotContained)
+{
+  IntRectangle r1(0, 0, 10, 10);
+  ASSERT_FALSE(r1.Contains(10, 10));
+}
+
+TEST(Rectangle, RectangleSize)
+{
+  IntRectangle r(0, 0, 10, 10);
+  ASSERT_EQ(r.GetWidth(), 10);
+  ASSERT_EQ(r.GetHeight(), 10);
+}
+
+TEST(Rectangle, IncludeAfterInvalid)
+{
+  IntRectangle r;
+  IntRectangle r2(0, 0, 10, 10);
+  ASSERT_FALSE(r.Valid());
+  ASSERT_TRUE(r2.Valid());
+  r.Include(r2);
+  ASSERT_EQ(r, r2);
+}
+
+TEST(Rectangle, EmptyRectangleHasNoExtents)
+{
+  IntRectangle r(0, 0, 0, 0);
+  ASSERT_FALSE(r.HasExtents());
+}
+
+TEST(Rectangle, NonEmptyRectangleHasExtents)
+{
+  IntRectangle r(0, 0, 1, 1);
+  ASSERT_TRUE(r.HasExtents());
+}
+
+TEST(Rectangle, RelationalOperators)
+{
+  IntRectangle r1(0, 0, 1, 1);
+  IntRectangle r2(1, 1, 2, 2);
+
+  ASSERT_EQ(r1, r1);
+  ASSERT_LE(r1, r1);
+  ASSERT_LE(r1, r2);
+  ASSERT_LT(r1, r2);
+  ASSERT_EQ(r2, r2);
+  ASSERT_GE(r2, r1);
+  ASSERT_GT(r2, r1);
+  ASSERT_NE(r1, r2);
+}
+