Add evaluate tests

test/main.test.cpp

@@ -34,3 +34,12 @@ TEST_CASE("divide-function work as designed", "[mathemathic-operations]") {
 	REQUIRE(divide(6,-2) == -3);
 }
 
+TEST_CASE("Evaluate Function for basic Functionality","[evaluate]") {
+	REQUIRE( evaluate("23+") == 5 );	
+	REQUIRE_THROWS_AS( evaluate("2%"), std::invalid_argument );
+	REQUIRE_THROWS_AS( evaluate("2+"), std::invalid_argument );
+	REQUIRE_THROWS_AS( evaluate("20/"), std::invalid_argument );
+	REQUIRE_THROWS_AS( evaluate(""), std::invalid_argument );
+}
+
+