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+/*
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+ * DoRayMe - a quick and dirty Raytracer
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+ * Group 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 <intersect.h>
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+#include <intersection.h>
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+#include <group.h>
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+#include <testshape.h>
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+#include <sphere.h>
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+
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+#include <transformation.h>
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+#include <gtest/gtest.h>
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+
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+TEST(GroupTest, Creating_a_new_group)
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+{
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+ Group g = Group();
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+
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+ ASSERT_EQ(g.transformMatrix, Matrix4().identity());
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+ ASSERT_TRUE(g.isEmpty());
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+}
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+
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+TEST(GroupTest, Adding_a_child_to_a_group)
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+{
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+ Group g = Group();
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+ TestShape s = TestShape();
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+
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+ g.addObject(&s);
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+
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+ ASSERT_FALSE(g.isEmpty());
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+ ASSERT_EQ(s.parent, &g);
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+ ASSERT_EQ(g[0], &s);
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+}
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+
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+TEST(GroupTest, Intersecting_a_ray_with_an_empty_group)
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+{
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+ Group g = Group();
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+ Ray r = Ray(Point(0, 0, 0), Vector(0, 0, 1));
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+ Intersect xs = g.intersect(r);
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+ ASSERT_EQ(xs.count(), 0);
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+}
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+
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+TEST(GroupTest, Intersecting_a_ray_with_an_nonempty_group)
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+{
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+ Group g = Group();
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+ Sphere s1 = Sphere();
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+ Sphere s2 = Sphere();
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+ Sphere s3 = Sphere();
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+
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+ s2.setTransform(translation(0, 0, -3));
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+ s3.setTransform(translation(5, 0, 0));
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+
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+ g.addObject(&s1);
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+ g.addObject(&s2);
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+ g.addObject(&s3);
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+
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+ Ray r = Ray(Point(0, 0, -5), Vector(0, 0, 1));
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+ Intersect xs = g.intersect(r);
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+ ASSERT_EQ(xs.count(), 4);
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+ EXPECT_EQ(xs[0].object, &s2);
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+ EXPECT_EQ(xs[1].object, &s2);
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+ EXPECT_EQ(xs[2].object, &s1);
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+ EXPECT_EQ(xs[3].object, &s1);
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+}
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+
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+TEST(GroupTest, Intersecting_a_transformer_group)
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+{
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+ Group g = Group();
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+ Sphere s = Sphere();
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+
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+ g.setTransform(scaling(2, 2, 2));
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+ s.setTransform(translation(5, 0, 0));
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+
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+ g.addObject(&s);
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+
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+ Ray r = Ray(Point(10, 0, -50), Vector(0, 0, 1));
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+ Intersect xs = g.intersect(r);
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+ ASSERT_EQ(xs.count(), 2);
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+}
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