added power test

test/test.cpp

@@ -32,3 +32,9 @@ TEST_CASE( "Test modulo function", "[calc]") {
   REQUIRE( evaluate("32%") == 1 );
   REQUIRE( evaluate("51%") == 4 );
 }
+
+TEST_CASE( "Basic power test", "[calc]") {
+  REQUIRE( evaluate("22^") == 4 );
+  REQUIRE( evaluate("43^") == 64 );
+  REQUIRE( evaluate("25^") == 32 );
+}
\ No newline at end of file