Commited Unit Test trigonometric Functions

test/test_trigonometricFunctions.c

@@ -21,3 +21,9 @@ void test_trigonometricFunctions_trigonometricFunctionsofcos(void) {
     result = calculate_cos_double(45);
     TEST_ASSERT_DOUBLE_WITHIN(0.1, expectedResult, *result);
 }
+void test_trigonometricFunctions_trigonometricFunctionsoftan(void) {
+    double expectedResult = 1.61977519 ;
+    double *result;
+    result = calculate_tan_double(45);
+    TEST_ASSERT_DOUBLE_WITHIN(0.1, expectedResult, *result);
+}