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tests/05_rays.cpp

@@ -89,13 +89,30 @@ SCENARIO("Computing a point from a distance", "[features/rays.feature]")
 
 SCENARIO("A ray intersects a sphere at two points", "[features/spheres.feature]")
 {
-    Ray r(Tuple::Point(0, 0, -5), Tuple::Vector(0, 0, 1));
+    GIVEN("r <- ray(point(0, 0, -5), vector(0, 0, 1))")
-    Sphere s;
+    {
-    Intersections xs = s.intersect(r);
+        Ray r(Tuple::Point(0, 0, -5), Tuple::Vector(0, 0, 1));
-
+        AND_GIVEN("s <- sphere()")
-    REQUIRE(xs.count() == 2);
+        {
-    REQUIRE(xs[0].distance_t() == 4.0);
+            Sphere s;
-    REQUIRE(xs[1].distance_t() == 6.0);
+            WHEN("xs <- intersect(s,r)")
+            {
+                Intersections xs = s.intersect(r);
+                THEN("xs.count = 2")
+                {
+                    REQUIRE(xs.count() == 2);
+                }
+                AND_THEN("xs[0] = 4.0")
+                {
+                    REQUIRE(xs[0].distance_t() == 4.0);
+                }
+                AND_THEN("xs[1 = 6.0")
+                {
+                    REQUIRE(xs[1].distance_t() == 6.0);
+                }
+            }
+        }
+    }
 }
 
 /* ------------------------------------------------------------------------- */