build: force a test failure

light/test_light.cc

@@ -459,3 +459,7 @@ TEST(mathlib, pointsAlongLine) {
     ASSERT_TRUE(pointsEqualEpsilon(vec3(1,0,0), res[0], POINT_EQUAL_EPSILON));
     ASSERT_TRUE(pointsEqualEpsilon(vec3(2.5,0,0), res[1], POINT_EQUAL_EPSILON));
 }
+
+TEST(mathlib, forcefail) {
+    ASSERT_FALSE(true);
+}