add two parsing test cases related to overloaded functions

test/SolidityParser.cpp

@@ -126,6 +126,31 @@ BOOST_AUTO_TEST_CASE(missing_argument_in_named_args)
 	BOOST_CHECK_THROW(parseText(text), ParserError);
 }
 
+BOOST_AUTO_TEST_CASE(two_exact_functions)
+{
+	char const* text = R"(
+		contract test {
+			function fun(uint a) returns(uint r) { return a; }
+			function fun(uint a) returns(uint r) { return a; }
+		}
+	)";
+	// with support of overloaded functions, during parsing,
+	// we can't determine whether they match exactly, however
+	// it will throw DeclarationError in following stage.
+	BOOST_CHECK_NO_THROW(parseText(text));
+}
+
+BOOST_AUTO_TEST_CASE(overloaded_functions)
+{
+	char const* text = R"(
+		contract test {
+			function fun(uint a) returns(uint r) { return a; }
+			function fun(uint a, uint b) returns(uint r) { return a + b; }
+		}
+	)";
+	BOOST_CHECK_NO_THROW(parseText(text));
+}
+
 BOOST_AUTO_TEST_CASE(function_natspec_documentation)
 {
 	ASTPointer<ContractDefinition> contract;