Test sphere class isHit method #12

tests/CMakeLists.txt

@@ -6,7 +6,7 @@ FetchContent_Declare(
 
 FetchContent_MakeAvailable(googletest)
 
-add_executable(raydiance_test vec3_test.cpp colour_test.cpp ray_test.cpp globals_test.cpp object_test.cpp interval_test.cpp)
+add_executable(raydiance_test vec3_test.cpp colour_test.cpp ray_test.cpp globals_test.cpp object_test.cpp interval_test.cpp sphere_test.cpp)
 
 target_link_libraries(raydiance_test raydiance_lib GTest::gtest_main)
 

tests/sphere_test.cpp

@@ -0,0 +1,33 @@
+#include "raydiance/sphere.h"
+#include <gtest/gtest.h>
+
+TEST(SphereTest, IsHit) {
+    sphere s1{point3{0.0, 0.0, -4.0}, 1.0};
+    sphere s2{point3{2.0, 0.0, 2.0}, 2.0};
+    sphere s3{point3{0.0, 0.0, 5.0}, 2.0};
+
+    ray r{point3{0.0, 0.0, 0.0}, vec3{0.0, 0.0, 1.0}};
+    intersection i;
+
+    EXPECT_FALSE(s1.isHit(r, interval{0.0, infinity}, i));
+
+    EXPECT_TRUE(s2.isHit(r, interval{0.0, infinity}, i));
+    EXPECT_DOUBLE_EQ(i.t, 2.0);
+    EXPECT_DOUBLE_EQ(i.p.x(), 0.0);
+    EXPECT_DOUBLE_EQ(i.p.y(), 0.0);
+    EXPECT_DOUBLE_EQ(i.p.z(), 2.0);
+    EXPECT_DOUBLE_EQ(i.normal.x(), 1.0);
+    EXPECT_DOUBLE_EQ(i.normal.y(), 0.0);
+    EXPECT_DOUBLE_EQ(i.normal.z(), 0.0);
+    EXPECT_FALSE(i.frontFace);
+
+    EXPECT_TRUE(s3.isHit(r, interval{0.0, infinity}, i));
+    EXPECT_DOUBLE_EQ(i.t, 3.0);
+    EXPECT_DOUBLE_EQ(i.p.x(), 0.0);
+    EXPECT_DOUBLE_EQ(i.p.y(), 0.0);
+    EXPECT_DOUBLE_EQ(i.p.z(), 3.0);
+    EXPECT_DOUBLE_EQ(i.normal.x(), 0.0);
+    EXPECT_DOUBLE_EQ(i.normal.y(), 0.0);
+    EXPECT_DOUBLE_EQ(i.normal.z(), -1.0);
+    EXPECT_TRUE(i.frontFace);
+}