Ported maths tests and added a test for #570.

Engine/source/math/test/mBoxTest.cpp

@@ -0,0 +1,42 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) 2014 GarageGames, LLC
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//-----------------------------------------------------------------------------
+
+#ifdef TORQUE_TESTS_ENABLED
+#include "testing/unitTesting.h"
+#include "math/mBox.h"
+
+TEST(Box3F, GetOverlap)
+{
+   Box3F b1(Point3F(-1, -1, -1), Point3F(1, 1, 1));
+   EXPECT_EQ(b1.getOverlap(b1), b1)
+      << "A box's overlap with itself should be itself.";
+
+   Box3F b2(Point3F(0, 0, 0), Point3F(1, 1, 1));
+   EXPECT_EQ(b1.getOverlap(b2), b2)
+      << "Box's overlap should be the intersection of two boxes.";
+
+   Box3F b3(Point3F(10, 10, 10), Point3F(11, 11, 11));
+   EXPECT_TRUE(b1.getOverlap(b3).isEmpty())
+      << "Overlap of boxes that do not overlap should be empty.";
+}
+
+#endif