Added multiple tests for arithmetic addition methods

test/test_arithmeticAddition.c

@@ -21,4 +21,25 @@ void test_arithmeticAddition_numberplusmaxintegervalueequalsnull(void) {
     int* result;
     result = addition_integer(INT_MAX, 1);
     TEST_ASSERT_NULL(result);
-}
+}
+
+void test_arithmeticAddition_doublenumbercalculationequalscorrectdoublenumber(void) {
+    double expectedResult = 5.500000;
+    double* result;
+    result = addition_double(3.5, 2.0);
+    TEST_ASSERT_EQUAL_DOUBLE(expectedResult, *result);
+}
+
+void test_arithmeticAddition_longnumbercalculationequalscorrectlong(void) {
+    long expectedResult = 10;
+    long* result;
+    result = addition_long(5, 5);
+    TEST_ASSERT_EQUAL_INT(expectedResult, *result);
+}
+
+void test_arithmeticAddition_floatnumbercalculationequalsfloat(void) {
+    float expectedResult = 5.5;
+    float* result;
+    result = addition_float(3.5, 2.0);
+    TEST_ASSERT_EQUAL_FLOAT(expectedResult, *result);
+}