diff --git a/unittest/test_test.cc b/unittest/test_test.cc
index 9360e1e..a70b0f0 100644
--- a/unittest/test_test.cc
+++ b/unittest/test_test.cc
@@ -7,4 +7,12 @@ TEST(SphereTest, ConstructorTest) {
     EXPECT_EQ(sph.getOrigin()[1], 1);
     EXPECT_EQ(sph.getOrigin()[2], 2);
     EXPECT_EQ(sph.getRadius(), 3);
-}
\ No newline at end of file
+}
+
+TEST(SphereTest, ConstructorTest2) {
+    Sphere sph(0, 1, 2, -3);
+    EXPECT_EQ(sph.getOrigin()[0], 0);
+    EXPECT_EQ(sph.getOrigin()[1], 1);
+    EXPECT_EQ(sph.getOrigin()[2], 2);
+    EXPECT_EQ(sph.getRadius(), 0);
+}