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@@ -8,6 +8,7 @@
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*/
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#include <ray.h>
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#include <sphere.h>
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+#include <transformation.h>
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#include <gtest/gtest.h>
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@@ -62,4 +63,46 @@ TEST(SphereTest, A_sphere_is_behind_a_ray)
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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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+
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+TEST(SphereTest, A_sphere_default_transformation)
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+{
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+ Sphere s = Sphere();
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+ ASSERT_EQ(s.transformMatrix, Matrix4().identity());
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+}
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+
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+TEST(SphereTest, Changing_a_sphere_transformation)
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+{
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+ Sphere s = Sphere();
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+ Matrix t = translation(2, 3, 4);
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+
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+ s.setTransform(t);
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+
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+ ASSERT_EQ(s.transformMatrix, t);
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+}
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+
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+TEST(SphereTest, Intersecting_a_scaled_sphere_with_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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+
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+ s.setTransform(scaling(2, 2, 2));
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+
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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, 3.0);
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+ ASSERT_EQ(xs[1].t, 7.0);
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+}
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+
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+TEST(SphereTest, Intersecting_a_translated_sphere_with_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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+
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+ s.setTransform(translation(5, 0, 0));
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+
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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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