More Ray work.

tests/ray_test.cpp

@@ -0,0 +1,32 @@
+/*
+ *  DoRayMe - a quick and dirty Raytracer
+ *  Ray unit tests
+ *
+ *  Created by Manoël Trapier
+ *  Copyright (c) 2020 986-Studio.
+ *
+ */
+#include <ray.h>
+#include <gtest/gtest.h>
+
+
+TEST(RayTest, Creating_a_ray_and_querying_it)
+{
+    Point origin = Point(1, 2, 3);
+    Vector direction = Vector(4, 5, 6);
+
+    Ray r = Ray(origin, direction);
+
+    ASSERT_EQ(r.origin, origin);
+    ASSERT_EQ(r.direction, direction);
+}
+
+TEST(RayTest, Computing_a_point_from_a_distance)
+{
+    Ray r = Ray(Point(2, 3, 4), Vector(1, 0, 0));
+
+    ASSERT_EQ(r.position(0), Point(2, 3, 4));
+    ASSERT_EQ(r.position(1), Point(3, 3, 4));
+    ASSERT_EQ(r.position(-1), Point(1, 3, 4));
+    ASSERT_EQ(r.position(2.5), Point(4.5, 3, 4));
+}