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+/*
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+ * DoRayMe - a quick and dirty Raytracer
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+ * Sphere unit tests
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+ *
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+ * Created by Manoël Trapier
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+ * Copyright (c) 2020 986-Studio.
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+ *
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+ */
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+#include <ray.h>
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+#include <sphere.h>
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+#include <gtest/gtest.h>
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+
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+
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+TEST(SphereTest, A_ray_intersect_a_sphere_at_two_points)
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+{
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+ Ray r = Ray(Point(0, 0, -5), Vector(0, 0, 1));
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+ Sphere s = Sphere();
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+ Intersect xs = s.intersect(r);
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+
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+ ASSERT_EQ(xs.count(), 2);
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+ ASSERT_EQ(xs[0]->t, 4.0);
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+ ASSERT_EQ(xs[1]->t, 6.0);
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+}
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+
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+TEST(SphereTest, A_ray_intersect_a_sphere_at_a_tangent)
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+{
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+ Ray r = Ray(Point(0, 1, -5), Vector(0, 0, 1));
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+ Sphere s = Sphere();
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+ Intersect xs = s.intersect(r);
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+
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+ ASSERT_EQ(xs.count(), 2);
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+ ASSERT_EQ(xs[0]->t, 5.0);
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+ ASSERT_EQ(xs[1]->t, 5.0);
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+}
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+
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+TEST(SphereTest, A_ray_miss_a_sphere)
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+{
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+ Ray r = Ray(Point(0, 2, -5), Vector(0, 0, 1));
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+ Sphere s = Sphere();
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+ Intersect xs = s.intersect(r);
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+
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+ ASSERT_EQ(xs.count(), 0);
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+}
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+
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+TEST(SphereTest, A_ray_originate_inside_a_sphere)
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+{
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+ Ray r = Ray(Point(0, 0, 0), Vector(0, 0, 1));
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+ Sphere s = Sphere();
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+ Intersect xs = s.intersect(r);
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+
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+ ASSERT_EQ(xs.count(), 2);
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+ ASSERT_EQ(xs[0]->t, -1.0);
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+ ASSERT_EQ(xs[1]->t, 1.0);
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+}
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+
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+TEST(SphereTest, A_sphere_is_behind_a_ray)
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+{
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+ Ray r = Ray(Point(0, 0, 5), Vector(0, 0, 1));
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+ Sphere s = Sphere();
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+ Intersect xs = s.intersect(r);
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+
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+ ASSERT_EQ(xs.count(), 2);
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+ ASSERT_EQ(xs[0]->t, -6.0);
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+ ASSERT_EQ(xs[1]->t, -4.0);
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+}
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