Working on worlds.

It's currently crashing.

tests/world_test.cpp

@@ -7,11 +7,54 @@
  *
  */
 #include <world.h>
+#include <light.h>
+#include <sphere.h>
+#include <material.h>
+#include <transformation.h>
+#include <worldbuilder.h>
 #include <math.h>
 #include <gtest/gtest.h>
 
 
-TEST(WorldTest, Test_for_an_empty_world)
+TEST(WorldTest, Creating_a_world)
 {
+    World w;
+
+    ASSERT_EQ(w.lightCount, 0);
+    ASSERT_EQ(w.objectCount, 0);
+}
+
+TEST(WorldTest, The_default_world)
+{
+    World w = DefaultWorld();
+
+    Light l = Light(POINT_LIGHT, Point(-10, 10, -10), Colour(1, 1, 1));
+    Sphere s1 = Sphere();
+    Sphere s2 = Sphere();
+    Material s1Mat = Material();
+    s1Mat.colour = Colour(0.8, 1.0, 0.6);
+    s1Mat.diffuse = 0.7;
+    s1Mat.specular = 0.2;
+    s1.setMaterial(s1Mat);
+
+    s2.setTransform(scaling(0.5, 0.5,0.5));
+
+    ASSERT_TRUE(w.lightIsIn(l));
+    ASSERT_TRUE(w.objectIsIn(s1));
+    ASSERT_TRUE(w.objectIsIn(s2));
+};
+
+TEST(WorldTest, Intersect_a_world_with_a_ray)
+{
+    World w = DefaultWorld();
+    Ray r = Ray(Point(0, 0, -5), Vector(0, 0, 1));
+
+    Intersect xs = w.intersect(r);
+
+    ASSERT_EQ(xs.count(), 4);
+    ASSERT_EQ(xs[0].t, 4);
+    ASSERT_EQ(xs[1].t, 4.5);
+    ASSERT_EQ(xs[2].t, 5.5);
+    ASSERT_EQ(xs[3].t, 6);
+}
 
-}