Boundingboxes should be ready.

Next step (later) would be to properly use them other than group to lower the number of intersection calculation per ray.

tests/boundingbox_test.cpp

@@ -0,0 +1,81 @@
+/*
+ *  DoRayMe - a quick and dirty Raytracer
+ *  Boundingbox unit tests
+ *
+ *  Created by Manoël Trapier
+ *  Copyright (c) 2020 986-Studio.
+ *
+ */
+/*
+ *  DoRayMe - a quick and dirty Raytracer
+ *  Camera unit tests
+ *
+ *  Created by Manoël Trapier
+ *  Copyright (c) 2020 986-Studio.
+ *
+ */
+#include <math.h>
+#include <math_helper.h>
+#include <ray.h>
+#include <transformation.h>
+#include <stdint.h>
+#include <boundingbox.h>
+#include <gtest/gtest.h>
+
+TEST(BoundingBox, Default_boundingbox_is_not_set)
+{
+    BoundingBox bb;
+
+    ASSERT_TRUE(bb.isEmpty());
+    ASSERT_EQ(bb.min, Point(INFINITY, INFINITY, INFINITY));
+    ASSERT_EQ(bb.max, Point(-INFINITY, -INFINITY, -INFINITY));
+}
+
+TEST(BoundingBox, Bounding_box_can_be_created_with_values)
+{
+    BoundingBox bb = BoundingBox(Point(-1, -1, -1), Point(1, 1, 1));
+
+    ASSERT_FALSE(bb.isEmpty());
+    ASSERT_EQ(bb.min, Point(-1, -1, -1));
+    ASSERT_EQ(bb.max, Point(1, 1, 1));
+}
+
+TEST(BoundingBox, Cating_a_bb_to_an_empty_bb_reset_the_original_one)
+{
+    BoundingBox bb;
+
+    bb | BoundingBox(Point(-1, -1, -1), Point(1, 1, 1));
+
+    ASSERT_FALSE(bb.isEmpty());
+    ASSERT_EQ(bb.min, Point(-1, -1, -1));
+    ASSERT_EQ(bb.max, Point(1, 1, 1));
+}
+
+TEST(BoundingBox, Cating_a_bb_to_another_bb_expand_the_original_one_if_needed)
+{
+    BoundingBox bb(Point(-1, -1, -1), Point(1, 1, 1));
+
+    bb | BoundingBox(Point(-2, 0, -5), Point(4, 5, 0.5));
+
+    ASSERT_FALSE(bb.isEmpty());
+    ASSERT_EQ(bb.min, Point(-2, -1, -5));
+    ASSERT_EQ(bb.max, Point(4, 5, 1));
+}
+
+TEST(BoundingBox, A_smaller_bb_should_fit_in_a_bigger)
+{
+    BoundingBox bigBb = BoundingBox(Point(-10, -10, -10), Point(10, 10, 10));
+
+    BoundingBox smallBb = BoundingBox(Point(-2, -2, -2), Point(2, 2, 2));
+
+    ASSERT_TRUE(bigBb.fitsIn(smallBb));
+}
+
+TEST(BoundingBox, A_big_bb_should_not_fit_in_a_smaller)
+{
+    BoundingBox bigBb = BoundingBox(Point(-10, -10, -10), Point(10, 10, 10));
+
+    BoundingBox smallBb = BoundingBox(Point(-2, -2, -2), Point(2, 2, 2));
+
+    ASSERT_FALSE(smallBb.fitsIn(bigBb));
+}