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+/*
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+ * DoRayMe - a quick and dirty Raytracer
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+ * Plane 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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+
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+#include <ray.h>
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+#include <shape.h>
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+#include <plane.h>
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+#include <material.h>
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+#include <transformation.h>
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+#include <gtest/gtest.h>
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+
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+TEST(PlaneTest, The_normal_of_a_plane_is_constant_everywhere)
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+{
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+ Plane p = Plane();
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+ Tuple n1 = p.normalAt(Point(0, 0, 0));
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+ Tuple n2 = p.normalAt(Point(10, 0, -10));
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+ Tuple n3 = p.normalAt(Point(-5, 0, 0150));
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+
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+ ASSERT_EQ(n1, Vector(0, 1, 0));
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+ ASSERT_EQ(n2, Vector(0, 1, 0));
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+ ASSERT_EQ(n3, Vector(0, 1, 0));
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+}
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+
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+TEST(PlaneTest, Intersect_with_a_ray_parallel_to_the_plane)
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+{
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+ Plane p = Plane();
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+ Ray r = Ray(Point(0, 10, 0), Vector(0, 0, 1));
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+
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+ Intersect xs = p.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(PlaneTest, Intersect_with_a_coplanar_ray)
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+{
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+ Plane p = Plane();
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+ Ray r = Ray(Point(0, 0, 0), Vector(0, 0, 1));
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+
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+ Intersect xs = p.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(PlaneTest, A_ray_intersecting_a_plane_from_above)
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+{
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+ Plane p = Plane();
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+ Ray r = Ray(Point(0, 1, 0), Vector(0, -1, 0));
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+
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+ Intersect xs = p.intersect(r);
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+
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+ ASSERT_EQ(xs.count(), 1);
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+ ASSERT_EQ(xs[0].t, 1);
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+ ASSERT_EQ(xs[0].object, &p);
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+}
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+
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+TEST(PlaneTest, A_ray_intersecting_a_plane_from_below)
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+{
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+ Plane p = Plane();
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+ Ray r = Ray(Point(0, -1, 0), Vector(0, 1, 0));
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+
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+ Intersect xs = p.intersect(r);
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+
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+ ASSERT_EQ(xs.count(), 1);
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+ ASSERT_EQ(xs[0].t, 1);
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+ ASSERT_EQ(xs[0].object, &p);
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+}
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