Unify parsing of simple test expectations and require lines to start with `//`.

test/TestCase.cpp

@@ -95,6 +95,20 @@ string TestCase::parseSourceAndSettings(istream& _stream)
 	return source;
 }
 
+string TestCase::parseSimpleExpectations(std::istream& _file)
+{
+	string result;
+	string line;
+	while (getline(_file, line))
+		if (boost::algorithm::starts_with(line, "// "))
+			result += line.substr(3) + "\n";
+		else if (line == "//")
+			result += "\n";
+		else
+			BOOST_THROW_EXCEPTION(runtime_error("Test expectations must start with \"// \"."));
+	return result;
+}
+
 void TestCase::expect(string::iterator& _it, string::iterator _end, string::value_type _c)
 {
 	if (_it == _end || *_it != _c)

test/TestCase.h

@@ -92,6 +92,8 @@ protected:
 	std::string parseSourceAndSettings(std::istream& _file);
 	static void expect(std::string::iterator& _it, std::string::iterator _end, std::string::value_type _c);
 
+	static std::string parseSimpleExpectations(std::istream& _file);
+
 	template<typename IteratorType>
 	static void skipWhitespace(IteratorType& _it, IteratorType _end)
 	{

test/libyul/ObjectCompilerTest.cpp

@@ -55,11 +55,7 @@ ObjectCompilerTest::ObjectCompilerTest(string const& _filename)
 			m_optimize = true;
 		m_source += line + "\n";
 	}
-	while (getline(file, line))
-		if (boost::algorithm::starts_with(line, "//"))
-			m_expectation += line.substr((line.size() >= 3 && line[2] == ' ') ? 3 : 2) + "\n";
-		else
-			m_expectation += line + "\n";
+	m_expectation = parseSimpleExpectations(file);
 }
 
 TestCase::TestResult ObjectCompilerTest::run(ostream& _stream, string const& _linePrefix, bool const _formatted)

test/libyul/YulInterpreterTest.cpp

@@ -54,13 +54,7 @@ YulInterpreterTest::YulInterpreterTest(string const& _filename)
 	file.exceptions(ios::badbit);
 
 	m_source = parseSourceAndSettings(file);
-
-	string line;
-	while (getline(file, line))
-		if (boost::algorithm::starts_with(line, "// "))
-			m_expectation += line.substr(3) + "\n";
-		else
-			m_expectation += line + "\n";
+	m_expectation = parseSimpleExpectations(file);
 }
 
 TestCase::TestResult YulInterpreterTest::run(ostream& _stream, string const& _linePrefix, bool const _formatted)

test/libyul/YulOptimizerTest.cpp

@@ -99,12 +99,7 @@ YulOptimizerTest::YulOptimizerTest(string const& _filename)
 		m_settings.erase("step");
 	}
 
-	string line;
-	while (getline(file, line))
-		if (boost::algorithm::starts_with(line, "// "))
-			m_expectation += line.substr(3) + "\n";
-		else
-			m_expectation += line + "\n";
+	m_expectation = parseSimpleExpectations(file);
 }
 
 TestCase::TestResult YulOptimizerTest::run(ostream& _stream, string const& _linePrefix, bool const _formatted)