diff --git a/libsolidity/interface/DebugSettings.h b/libsolidity/interface/DebugSettings.h
index 67c6d8810..34818889c 100644
--- a/libsolidity/interface/DebugSettings.h
+++ b/libsolidity/interface/DebugSettings.h
@@ -54,7 +54,7 @@ inline std::optional<RevertStrings> revertStringsFromString(std::string const& _
 	for (auto i: {RevertStrings::Default, RevertStrings::Strip, RevertStrings::Debug, RevertStrings::VerboseDebug})
 		if (revertStringsToString(i) == _str)
 			return i;
-	return {};
+	return std::nullopt;
 }
 
 }
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index fa9127e72..00c682416 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -13,6 +13,8 @@ set(sources
     Metadata.h
     TestCase.cpp
     TestCase.h
+    TestCaseReader.cpp
+    TestCaseReader.h
 )
 detect_stray_source_files("${sources}" ".")
 
diff --git a/test/CommonSyntaxTest.cpp b/test/CommonSyntaxTest.cpp
index 6d72ce010..ebc80dc2f 100644
--- a/test/CommonSyntaxTest.cpp
+++ b/test/CommonSyntaxTest.cpp
@@ -56,16 +56,12 @@ int parseUnsignedInteger(string::iterator& _it, string::iterator _end)
 
 }
 
-CommonSyntaxTest::CommonSyntaxTest(string const& _filename, langutil::EVMVersion _evmVersion): m_evmVersion(_evmVersion)
+CommonSyntaxTest::CommonSyntaxTest(string const& _filename, langutil::EVMVersion _evmVersion):
+	EVMVersionRestrictedTestCase(_filename),
+	m_evmVersion(_evmVersion)
 {
-	ifstream file(_filename);
-	if (!file)
-		BOOST_THROW_EXCEPTION(runtime_error("Cannot open test contract: \"" + _filename + "\"."));
-	file.exceptions(ios::badbit);
-
-	m_sources = parseSourcesAndSettings(file);
-
-	m_expectations = parseExpectations(file);
+	m_sources = m_reader.sources();
+	m_expectations = parseExpectations(m_reader.stream());
 }
 
 TestCase::TestResult CommonSyntaxTest::run(ostream& _stream, string const& _linePrefix, bool _formatted)
diff --git a/test/TestCase.cpp b/test/TestCase.cpp
index 6b0a16e27..8b2afc780 100644
--- a/test/TestCase.cpp
+++ b/test/TestCase.cpp
@@ -18,16 +18,9 @@
 #include <test/Common.h>
 #include <test/TestCase.h>
 
-#include <libsolutil/StringUtils.h>
-
-#include <boost/algorithm/cxx11/none_of.hpp>
-#include <boost/algorithm/string.hpp>
 #include <boost/algorithm/string/predicate.hpp>
-#include <boost/algorithm/string/trim.hpp>
-#include <boost/range/adaptor/map.hpp>
 
 #include <stdexcept>
-
 #include <iostream>
 
 using namespace std;
@@ -37,11 +30,12 @@ using namespace solidity::frontend::test;
 
 void TestCase::printUpdatedSettings(ostream& _stream, const string& _linePrefix, const bool)
 {
-	if (m_validatedSettings.empty())
+	auto& settings = m_reader.settings();
+	if (settings.empty())
 		return;
 
 	_stream << _linePrefix << "// ====" << endl;
-	for (auto const& setting: m_validatedSettings)
+	for (auto const& setting: settings)
 		_stream << _linePrefix << "// " << setting.first << ": " << setting.second << endl;
 }
 
@@ -53,108 +47,12 @@ bool TestCase::isTestFilename(boost::filesystem::path const& _filename)
 			!boost::starts_with(_filename.string(), ".");
 }
 
-void TestCase::validateSettings()
-{
-	if (!m_settings.empty())
-		throw runtime_error(
-			"Unknown setting(s): " +
-			util::joinHumanReadable(m_settings | boost::adaptors::map_keys)
-		);
-}
-
 bool TestCase::shouldRun()
 {
+	m_reader.ensureAllSettingsRead();
 	return m_shouldRun;
 }
 
-pair<map<string, string>, size_t> TestCase::parseSourcesAndSettingsWithLineNumbers(istream& _stream)
-{
-	map<string, string> sources;
-	string currentSourceName;
-	string currentSource;
-	string line;
-	size_t lineNumber = 1;
-	static string const sourceDelimiterStart("==== Source:");
-	static string const sourceDelimiterEnd("====");
-	static string const comment("// ");
-	static string const settingsDelimiter("// ====");
-	static string const delimiter("// ----");
-	bool sourcePart = true;
-	while (getline(_stream, line))
-	{
-		lineNumber++;
-
-		if (boost::algorithm::starts_with(line, delimiter))
-			break;
-		else if (boost::algorithm::starts_with(line, settingsDelimiter))
-			sourcePart = false;
-		else if (sourcePart)
-		{
-			if (boost::algorithm::starts_with(line, sourceDelimiterStart) && boost::algorithm::ends_with(line, sourceDelimiterEnd))
-			{
-				if (!(currentSourceName.empty() && currentSource.empty()))
-					sources[currentSourceName] = std::move(currentSource);
-				currentSource = {};
-				currentSourceName = boost::trim_copy(line.substr(
-					sourceDelimiterStart.size(),
-					line.size() - sourceDelimiterEnd.size() - sourceDelimiterStart.size()
-				));
-				if (sources.count(currentSourceName))
-					throw runtime_error("Multiple definitions of test source \"" + currentSourceName + "\".");
-			}
-			else
-				currentSource += line + "\n";
-		}
-		else if (boost::algorithm::starts_with(line, comment))
-		{
-			size_t colon = line.find(':');
-			if (colon == string::npos)
-				throw runtime_error(string("Expected \":\" inside setting."));
-			string key = line.substr(comment.size(), colon - comment.size());
-			string value = line.substr(colon + 1);
-			boost::algorithm::trim(key);
-			boost::algorithm::trim(value);
-			m_settings[key] = value;
-		}
-		else
-			throw runtime_error(string("Expected \"//\" or \"// ---\" to terminate settings and source."));
-	}
-	sources[currentSourceName] = currentSource;
-	return {sources, lineNumber};
-}
-
-map<string, string> TestCase::parseSourcesAndSettings(istream& _stream)
-{
-	return get<0>(parseSourcesAndSettingsWithLineNumbers(_stream));
-}
-
-pair<string, size_t> TestCase::parseSourceAndSettingsWithLineNumbers(istream& _stream)
-{
-	auto [sourceMap, lineOffset] = parseSourcesAndSettingsWithLineNumbers(_stream);
-	if (sourceMap.size() != 1)
-		BOOST_THROW_EXCEPTION(runtime_error("Expected single source definition, but got multiple sources."));
-	return {std::move(sourceMap.begin()->second), lineOffset};
-}
-
-string TestCase::parseSourceAndSettings(istream& _stream)
-{
-	return parseSourceAndSettingsWithLineNumbers(_stream).first;
-}
-
-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)
@@ -162,19 +60,13 @@ void TestCase::expect(string::iterator& _it, string::iterator _end, string::valu
 	++_it;
 }
 
-void EVMVersionRestrictedTestCase::validateSettings()
+EVMVersionRestrictedTestCase::EVMVersionRestrictedTestCase(string const& _filename):
+	TestCase(_filename)
 {
-	if (!m_settings.count("EVMVersion"))
+	if (!m_reader.hasSetting("EVMVersion"))
 		return;
 
-	string versionString = m_settings["EVMVersion"];
-	m_validatedSettings["EVMVersion"] = versionString;
-	m_settings.erase("EVMVersion");
-
-	TestCase::validateSettings();
-
-	if (versionString.empty())
-		return;
+	string versionString = m_reader.stringSetting("EVMVersion", "");
 
 	string comparator;
 	size_t versionBegin = 0;
diff --git a/test/TestCase.h b/test/TestCase.h
index d6afff8b8..b4e7e3972 100644
--- a/test/TestCase.h
+++ b/test/TestCase.h
@@ -17,16 +17,13 @@
 
 #pragma once
 
+#include <test/TestCaseReader.h>
+
 #include <liblangutil/EVMVersion.h>
 
 #include <boost/filesystem.hpp>
 
-#include <functional>
-#include <iosfwd>
-#include <memory>
 #include <string>
-#include <vector>
-#include <map>
 
 namespace solidity::frontend::test
 {
@@ -68,23 +65,19 @@ public:
 
 	static bool isTestFilename(boost::filesystem::path const& _filename);
 
-	/// Validates the settings, i.e. moves them from m_settings to m_validatedSettings.
-	/// Throws a runtime exception if any setting is left at this class (i.e. unknown setting).
-	virtual void validateSettings();
-
 	/// Returns true, if the test case is supported in the current environment and false
 	/// otherwise which causes this test to be skipped.
 	/// This might check e.g. for restrictions on the EVM version.
+	/// The function throws an exception if there are unread settings.
 	bool shouldRun();
 
 protected:
-	std::pair<std::map<std::string, std::string>, std::size_t> parseSourcesAndSettingsWithLineNumbers(std::istream& _file);
-	std::map<std::string, std::string> parseSourcesAndSettings(std::istream& _file);
-	std::pair<std::string, std::size_t> parseSourceAndSettingsWithLineNumbers(std::istream& _file);
-	std::string parseSourceAndSettings(std::istream& _file);
-	static void expect(std::string::iterator& _it, std::string::iterator _end, std::string::value_type _c);
+	// Used by ASTJSONTest, the only TestCase class with a custom parser of the test files.
+	TestCase() = default;
 
-	static std::string parseSimpleExpectations(std::istream& _file);
+	TestCase(std::string const& _filename): m_reader(_filename) {}
+
+	static void expect(std::string::iterator& _it, std::string::iterator _end, std::string::value_type _c);
 
 	template<typename IteratorType>
 	static void skipWhitespace(IteratorType& _it, IteratorType _end)
@@ -100,18 +93,14 @@ protected:
 			++_it;
 	}
 
-	/// Parsed settings.
-	std::map<std::string, std::string> m_settings;
-	/// Updated settings after validation.
-	std::map<std::string, std::string> m_validatedSettings;
-
+	TestCaseReader m_reader;
 	bool m_shouldRun = true;
 };
 
 class EVMVersionRestrictedTestCase: public TestCase
 {
-public:
-	void validateSettings() override;
+protected:
+	EVMVersionRestrictedTestCase(std::string const& _filename);
 };
 
 }
diff --git a/test/TestCaseReader.cpp b/test/TestCaseReader.cpp
new file mode 100644
index 000000000..2b7e201af
--- /dev/null
+++ b/test/TestCaseReader.cpp
@@ -0,0 +1,174 @@
+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <test/TestCaseReader.h>
+
+#include <libsolutil/StringUtils.h>
+
+#include <boost/algorithm/string.hpp>
+#include <boost/range/adaptor/map.hpp>
+#include <boost/throw_exception.hpp>
+
+using namespace std;
+using namespace solidity::frontend::test;
+
+TestCaseReader::TestCaseReader(string const& _filename):
+	m_file(_filename)
+{
+	if (!m_file)
+		BOOST_THROW_EXCEPTION(runtime_error("Cannot open file: \"" + _filename + "\"."));
+	m_file.exceptions(ios::badbit);
+
+	tie(m_sources, m_lineNumber) = parseSourcesAndSettingsWithLineNumber(m_file);
+	m_unreadSettings = m_settings;
+}
+
+string const& TestCaseReader::source()
+{
+	if (m_sources.size() != 1)
+		BOOST_THROW_EXCEPTION(runtime_error("Expected single source definition, but got multiple sources."));
+	return m_sources.begin()->second;
+}
+
+string TestCaseReader::simpleExpectations()
+{
+	return parseSimpleExpectations(m_file);
+}
+
+bool TestCaseReader::hasSetting(std::string const& _name) const
+{
+	return m_settings.count(_name) != 0;
+}
+
+bool TestCaseReader::boolSetting(std::string const& _name, bool _defaultValue)
+{
+	if (!hasSetting(_name))
+		return _defaultValue;
+
+	m_unreadSettings.erase(_name);
+	string value = m_settings.at(_name);
+	if (value == "false")
+		return false;
+	if (value == "true")
+		return true;
+
+	BOOST_THROW_EXCEPTION(runtime_error("Invalid Boolean value: " + value + "."));
+}
+
+size_t TestCaseReader::sizetSetting(std::string const& _name, size_t _defaultValue)
+{
+	if (!hasSetting(_name))
+		return _defaultValue;
+
+	m_unreadSettings.erase(_name);
+
+	static_assert(sizeof(unsigned long) <= sizeof(size_t));
+	return stoul(m_settings.at(_name));
+}
+
+string TestCaseReader::stringSetting(string const& _name, string const& _defaultValue)
+{
+	if (!hasSetting(_name))
+		return _defaultValue;
+
+	m_unreadSettings.erase(_name);
+	return m_settings.at(_name);
+}
+
+void TestCaseReader::setSetting(std::string const& _name, std::string const& _value)
+{
+	m_settings[_name] = _value;
+}
+
+void TestCaseReader::ensureAllSettingsRead() const
+{
+	if (!m_unreadSettings.empty())
+		throw runtime_error(
+			"Unknown setting(s): " +
+			util::joinHumanReadable(m_unreadSettings | boost::adaptors::map_keys)
+		);
+}
+
+pair<map<string, string>, size_t> TestCaseReader::parseSourcesAndSettingsWithLineNumber(istream& _stream)
+{
+	map<string, string> sources;
+	string currentSourceName;
+	string currentSource;
+	string line;
+	size_t lineNumber = 1;
+	static string const sourceDelimiterStart("==== Source:");
+	static string const sourceDelimiterEnd("====");
+	static string const comment("// ");
+	static string const settingsDelimiter("// ====");
+	static string const delimiter("// ----");
+	bool sourcePart = true;
+	while (getline(_stream, line))
+	{
+		lineNumber++;
+
+		if (boost::algorithm::starts_with(line, delimiter))
+			break;
+		else if (boost::algorithm::starts_with(line, settingsDelimiter))
+			sourcePart = false;
+		else if (sourcePart)
+		{
+			if (boost::algorithm::starts_with(line, sourceDelimiterStart) && boost::algorithm::ends_with(line, sourceDelimiterEnd))
+			{
+				if (!(currentSourceName.empty() && currentSource.empty()))
+					sources[currentSourceName] = std::move(currentSource);
+				currentSource = {};
+				currentSourceName = boost::trim_copy(line.substr(
+					sourceDelimiterStart.size(),
+					line.size() - sourceDelimiterEnd.size() - sourceDelimiterStart.size()
+				));
+				if (sources.count(currentSourceName))
+					throw runtime_error("Multiple definitions of test source \"" + currentSourceName + "\".");
+			}
+			else
+				currentSource += line + "\n";
+		}
+		else if (boost::algorithm::starts_with(line, comment))
+		{
+			size_t colon = line.find(':');
+			if (colon == string::npos)
+				throw runtime_error(string("Expected \":\" inside setting."));
+			string key = line.substr(comment.size(), colon - comment.size());
+			string value = line.substr(colon + 1);
+			boost::algorithm::trim(key);
+			boost::algorithm::trim(value);
+			m_settings[key] = value;
+		}
+		else
+			throw runtime_error(string("Expected \"//\" or \"// ---\" to terminate settings and source."));
+	}
+	sources[currentSourceName] = currentSource;
+	return { sources, lineNumber };
+}
+
+string TestCaseReader::parseSimpleExpectations(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;
+}
diff --git a/test/TestCaseReader.h b/test/TestCaseReader.h
new file mode 100644
index 000000000..055b355b7
--- /dev/null
+++ b/test/TestCaseReader.h
@@ -0,0 +1,61 @@
+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <fstream>
+#include <map>
+#include <string>
+
+#pragma once
+
+namespace solidity::frontend::test
+{
+/**
+ * A reader for test case data file, which parses source, settings and (optionally) simple expectations.
+ */
+class TestCaseReader
+{
+public:
+	TestCaseReader() = default;
+	explicit TestCaseReader(std::string const& _filename);
+
+	std::map<std::string, std::string> const& sources() { return m_sources; }
+	std::string const& source();
+	std::size_t lineNumber() { return m_lineNumber; }
+	std::map<std::string, std::string> const& settings() { return m_settings; }
+	std::ifstream& stream() { return m_file; }
+
+	std::string simpleExpectations();
+
+	bool hasSetting(std::string const& _name) const;
+	bool boolSetting(std::string const& _name, bool _defaultValue);
+	size_t sizetSetting(std::string const& _name, size_t _defaultValue);
+	std::string stringSetting(std::string const& _name, std::string const& _defaultValue);
+	void setSetting(std::string const& _name, std::string const& _value);
+
+	void ensureAllSettingsRead() const;
+
+private:
+	std::pair<std::map<std::string, std::string>, std::size_t> parseSourcesAndSettingsWithLineNumber(std::istream& _file);
+	static std::string parseSimpleExpectations(std::istream& _file);
+
+	std::ifstream m_file;
+	std::map<std::string, std::string> m_sources;
+	std::size_t m_lineNumber = 0;
+	std::map<std::string, std::string> m_settings;
+	std::map<std::string, std::string> m_unreadSettings; ///< tracks which settings are left unread
+};
+}
diff --git a/test/boostTest.cpp b/test/boostTest.cpp
index 3137a5085..5a76a3f18 100644
--- a/test/boostTest.cpp
+++ b/test/boostTest.cpp
@@ -94,7 +94,6 @@ int registerTests(
 					{
 						stringstream errorStream;
 						auto testCase = _testCaseCreator(config);
-						testCase->validateSettings();
 						if (testCase->shouldRun())
 							switch (testCase->run(errorStream))
 							{
diff --git a/test/libsolidity/ABIJsonTest.cpp b/test/libsolidity/ABIJsonTest.cpp
index 1da0193ab..e7a0cce6d 100644
--- a/test/libsolidity/ABIJsonTest.cpp
+++ b/test/libsolidity/ABIJsonTest.cpp
@@ -36,15 +36,11 @@ using namespace solidity::util;
 using namespace solidity::frontend;
 using namespace solidity::frontend::test;
 
-ABIJsonTest::ABIJsonTest(string const& _filename)
+ABIJsonTest::ABIJsonTest(string const& _filename):
+	TestCase(_filename)
 {
-	ifstream file(_filename);
-	if (!file)
-		BOOST_THROW_EXCEPTION(runtime_error("Cannot open test contract: \"" + _filename + "\"."));
-	file.exceptions(ios::badbit);
-
-	m_source = parseSourceAndSettings(file);
-	m_expectation = parseSimpleExpectations(file);
+	m_source = m_reader.source();
+	m_expectation = m_reader.simpleExpectations();
 }
 
 TestCase::TestResult ABIJsonTest::run(ostream& _stream, string const& _linePrefix, bool _formatted)
diff --git a/test/libsolidity/GasTest.cpp b/test/libsolidity/GasTest.cpp
index b1b0d56f2..694839b99 100644
--- a/test/libsolidity/GasTest.cpp
+++ b/test/libsolidity/GasTest.cpp
@@ -36,35 +36,14 @@ using namespace std;
 namespace fs = boost::filesystem;
 using namespace boost::unit_test;
 
-GasTest::GasTest(string const& _filename)
+GasTest::GasTest(string const& _filename):
+	TestCase(_filename)
 {
-	ifstream file(_filename);
-	if (!file)
-		BOOST_THROW_EXCEPTION(runtime_error("Cannot open test contract: \"" + _filename + "\"."));
-	file.exceptions(ios::badbit);
-
-	m_source = parseSourceAndSettings(file);
-
-	if (m_settings.count("optimize"))
-	{
-		m_optimise = true;
-		m_validatedSettings["optimize"] = "true";
-		m_settings.erase("optimize");
-	}
-	if (m_settings.count("optimize-yul"))
-	{
-		m_optimiseYul = true;
-		m_validatedSettings["optimize-yul"] = "true";
-		m_settings.erase("optimize-yul");
-	}
-	if (m_settings.count("optimize-runs"))
-	{
-		m_optimiseRuns = stoul(m_settings["optimize-runs"]);
-		m_validatedSettings["optimize-runs"] = m_settings["optimize-runs"];
-		m_settings.erase("optimize-runs");
-	}
-
-	parseExpectations(file);
+	m_source = m_reader.source();
+	m_optimise = m_reader.boolSetting("optimize", false);
+	m_optimiseYul = m_reader.boolSetting("optimize-yul", false);
+	m_optimiseRuns = m_reader.sizetSetting("optimize-runs", 200);
+	parseExpectations(m_reader.stream());
 }
 
 void GasTest::parseExpectations(std::istream& _stream)
diff --git a/test/libsolidity/SMTCheckerTest.cpp b/test/libsolidity/SMTCheckerTest.cpp
index 912349182..f0bfed8d4 100644
--- a/test/libsolidity/SMTCheckerTest.cpp
+++ b/test/libsolidity/SMTCheckerTest.cpp
@@ -28,22 +28,17 @@ using namespace solidity::frontend::test;
 
 SMTCheckerTest::SMTCheckerTest(string const& _filename, langutil::EVMVersion _evmVersion): SyntaxTest(_filename, _evmVersion)
 {
-	if (m_settings.count("SMTSolvers"))
-	{
-		auto const& choice = m_settings.at("SMTSolvers");
-		if (choice == "any")
-			m_enabledSolvers = smt::SMTSolverChoice::All();
-		else if (choice == "z3")
-			m_enabledSolvers = smt::SMTSolverChoice::Z3();
-		else if (choice == "cvc4")
-			m_enabledSolvers = smt::SMTSolverChoice::CVC4();
-		else if (choice == "none")
-			m_enabledSolvers = smt::SMTSolverChoice::None();
-		else
-			BOOST_THROW_EXCEPTION(runtime_error("Invalid SMT solver choice."));
-	}
-	else
+	auto const& choice = m_reader.stringSetting("SMTSolvers", "any");
+	if (choice == "any")
 		m_enabledSolvers = smt::SMTSolverChoice::All();
+	else if (choice == "z3")
+		m_enabledSolvers = smt::SMTSolverChoice::Z3();
+	else if (choice == "cvc4")
+		m_enabledSolvers = smt::SMTSolverChoice::CVC4();
+	else if (choice == "none")
+		m_enabledSolvers = smt::SMTSolverChoice::None();
+	else
+		BOOST_THROW_EXCEPTION(runtime_error("Invalid SMT solver choice."));
 
 	auto available = ModelChecker::availableSolvers();
 	if (!available.z3)
diff --git a/test/libsolidity/SemanticTest.cpp b/test/libsolidity/SemanticTest.cpp
index 97c83a3e5..8b5112e12 100644
--- a/test/libsolidity/SemanticTest.cpp
+++ b/test/libsolidity/SemanticTest.cpp
@@ -37,59 +37,39 @@ namespace fs = boost::filesystem;
 
 
 SemanticTest::SemanticTest(string const& _filename, langutil::EVMVersion _evmVersion):
-	SolidityExecutionFramework(_evmVersion)
+	SolidityExecutionFramework(_evmVersion),
+	EVMVersionRestrictedTestCase(_filename)
 {
-	ifstream file(_filename);
-	soltestAssert(file, "Cannot open test contract: \"" + _filename + "\".");
-	file.exceptions(ios::badbit);
+	m_source = m_reader.source();
+	m_lineOffset = m_reader.lineNumber();
 
-	std::tie(m_source, m_lineOffset) = parseSourceAndSettingsWithLineNumbers(file);
-
-	if (m_settings.count("compileViaYul"))
+	if (m_reader.hasSetting("compileViaYul"))
 	{
-		if (m_settings["compileViaYul"] == "also")
+		string choice = m_reader.stringSetting("compileViaYul", "");
+		if (choice == "also")
 		{
-			m_validatedSettings["compileViaYul"] = m_settings["compileViaYul"];
 			m_runWithYul = true;
 			m_runWithoutYul = true;
 		}
 		else
 		{
-			m_validatedSettings["compileViaYul"] = "only";
+			m_reader.setSetting("compileViaYul", "only");
 			m_runWithYul = true;
 			m_runWithoutYul = false;
 		}
-		m_settings.erase("compileViaYul");
-	}
-	if (m_settings.count("ABIEncoderV1Only"))
-	{
-		if (m_settings["ABIEncoderV1Only"] == "true")
-		{
-			m_validatedSettings["ABIEncoderV1Only"] = "true";
-			m_runWithABIEncoderV1Only = true;
-		}
-		m_settings.erase("ABIEncoderV1Only");
 	}
 
+	m_runWithABIEncoderV1Only = m_reader.boolSetting("ABIEncoderV1Only", false);
 	if (m_runWithABIEncoderV1Only && solidity::test::CommonOptions::get().useABIEncoderV2)
 		m_shouldRun = false;
 
-	if (m_settings.count("revertStrings"))
-	{
-		auto revertStrings = revertStringsFromString(m_settings["revertStrings"]);
-		if (revertStrings)
-			m_revertStrings = *revertStrings;
-		m_validatedSettings["revertStrings"] = revertStringsToString(m_revertStrings);
-		m_settings.erase("revertStrings");
-	}
+	auto revertStrings = revertStringsFromString(m_reader.stringSetting("revertStrings", "default"));
+	soltestAssert(revertStrings, "Invalid revertStrings setting.");
+	m_revertStrings = revertStrings.value();
 
-	if (m_settings.count("allowNonExistingFunctions"))
-	{
-		m_validatedSettings["allowNonExistingFunctions"] = true;
-		m_settings.erase("allowNonExistingFunctions");
-	}
+	m_allowNonExistingFunctions = m_reader.boolSetting("allowNonExistingFunctions", false);
 
-	parseExpectations(file);
+	parseExpectations(m_reader.stream());
 	soltestAssert(!m_tests.empty(), "No tests specified in " + _filename);
 }
 
@@ -152,7 +132,7 @@ TestCase::TestResult SemanticTest::run(ostream& _stream, string const& _linePref
 				else
 				{
 					soltestAssert(
-						m_validatedSettings.count("allowNonExistingFunctions") || m_compiler.methodIdentifiers(m_compiler.lastContractName()).isMember(test.call().signature),
+						m_allowNonExistingFunctions || m_compiler.methodIdentifiers(m_compiler.lastContractName()).isMember(test.call().signature),
 						"The function " + test.call().signature + " is not known to the compiler"
 					);
 
diff --git a/test/libsolidity/SemanticTest.h b/test/libsolidity/SemanticTest.h
index 0ea486cad..94c29e193 100644
--- a/test/libsolidity/SemanticTest.h
+++ b/test/libsolidity/SemanticTest.h
@@ -65,6 +65,7 @@ private:
 	bool m_runWithYul = false;
 	bool m_runWithoutYul = true;
 	bool m_runWithABIEncoderV1Only = false;
+	bool m_allowNonExistingFunctions = false;
 };
 
 }
diff --git a/test/libsolidity/SyntaxTest.cpp b/test/libsolidity/SyntaxTest.cpp
index 1938cfe86..031a6085f 100644
--- a/test/libsolidity/SyntaxTest.cpp
+++ b/test/libsolidity/SyntaxTest.cpp
@@ -37,20 +37,7 @@ namespace fs = boost::filesystem;
 
 SyntaxTest::SyntaxTest(string const& _filename, langutil::EVMVersion _evmVersion, bool _parserErrorRecovery): CommonSyntaxTest(_filename, _evmVersion)
 {
-	if (m_settings.count("optimize-yul"))
-	{
-		if (m_settings["optimize-yul"] == "true")
-		{
-			m_validatedSettings["optimize-yul"] = "true";
-			m_settings.erase("optimize-yul");
-		}
-		else if (m_settings["optimize-yul"] == "false")
-		{
-			m_validatedSettings["optimize-yul"] = "false";
-			m_settings.erase("optimize-yul");
-			m_optimiseYul = false;
-		}
-	}
+	m_optimiseYul = m_reader.boolSetting("optimize-yul", true);
 	m_parserErrorRecovery = _parserErrorRecovery;
 }
 
diff --git a/test/libyul/EwasmTranslationTest.cpp b/test/libyul/EwasmTranslationTest.cpp
index fdee56bda..a545b6124 100644
--- a/test/libyul/EwasmTranslationTest.cpp
+++ b/test/libyul/EwasmTranslationTest.cpp
@@ -48,17 +48,11 @@ using namespace solidity::frontend::test;
 using namespace std;
 
 
-EwasmTranslationTest::EwasmTranslationTest(string const& _filename)
+EwasmTranslationTest::EwasmTranslationTest(string const& _filename):
+	EVMVersionRestrictedTestCase(_filename)
 {
-	boost::filesystem::path path(_filename);
-
-	ifstream file(_filename);
-	if (!file)
-		BOOST_THROW_EXCEPTION(runtime_error("Cannot open test case: \"" + _filename + "\"."));
-	file.exceptions(ios::badbit);
-
-	m_source = parseSourceAndSettings(file);
-	m_expectation = parseSimpleExpectations(file);
+	m_source = m_reader.source();
+	m_expectation = m_reader.simpleExpectations();
 }
 
 TestCase::TestResult EwasmTranslationTest::run(ostream& _stream, string const& _linePrefix, bool const _formatted)
diff --git a/test/libyul/FunctionSideEffects.cpp b/test/libyul/FunctionSideEffects.cpp
index 2d74d5501..db3a39df0 100644
--- a/test/libyul/FunctionSideEffects.cpp
+++ b/test/libyul/FunctionSideEffects.cpp
@@ -60,15 +60,11 @@ string toString(SideEffects const& _sideEffects)
 }
 }
 
-FunctionSideEffects::FunctionSideEffects(string const& _filename)
+FunctionSideEffects::FunctionSideEffects(string const& _filename):
+	TestCase(_filename)
 {
-	ifstream file(_filename);
-	if (!file)
-		BOOST_THROW_EXCEPTION(runtime_error("Cannot open test input: \"" + _filename + "\"."));
-	file.exceptions(ios::badbit);
-
-	m_source = parseSourceAndSettings(file);
-	m_expectation = parseSimpleExpectations(file);
+	m_source = m_reader.source();
+	m_expectation = m_reader.simpleExpectations();
 }
 
 TestCase::TestResult FunctionSideEffects::run(ostream& _stream, string const& _linePrefix, bool _formatted)
diff --git a/test/libyul/ObjectCompilerTest.cpp b/test/libyul/ObjectCompilerTest.cpp
index f1b284042..9dd589748 100644
--- a/test/libyul/ObjectCompilerTest.cpp
+++ b/test/libyul/ObjectCompilerTest.cpp
@@ -38,23 +38,12 @@ using namespace solidity::frontend;
 using namespace solidity::frontend::test;
 using namespace std;
 
-ObjectCompilerTest::ObjectCompilerTest(string const& _filename)
+ObjectCompilerTest::ObjectCompilerTest(string const& _filename):
+	TestCase(_filename)
 {
-	boost::filesystem::path path(_filename);
-
-	ifstream file(_filename);
-	if (!file)
-		BOOST_THROW_EXCEPTION(runtime_error("Cannot open test case: \"" + _filename + "\"."));
-	file.exceptions(ios::badbit);
-
-	m_source = parseSourceAndSettings(file);
-	if (m_settings.count("optimize"))
-	{
-		m_optimize = true;
-		m_validatedSettings["optimize"] = "true";
-		m_settings.erase("optimize");
-	}
-	m_expectation = parseSimpleExpectations(file);
+	m_source = m_reader.source();
+	m_optimize = m_reader.boolSetting("optimize", false);
+	m_expectation = m_reader.simpleExpectations();
 }
 
 TestCase::TestResult ObjectCompilerTest::run(ostream& _stream, string const& _linePrefix, bool const _formatted)
diff --git a/test/libyul/SyntaxTest.cpp b/test/libyul/SyntaxTest.cpp
index 75e38c844..8e5862b43 100644
--- a/test/libyul/SyntaxTest.cpp
+++ b/test/libyul/SyntaxTest.cpp
@@ -70,9 +70,7 @@ vector<string> validDialectNames()
 
 void SyntaxTest::parseAndAnalyze()
 {
-	string dialectName = m_validatedSettings.count("dialect") ? m_validatedSettings["dialect"] : "evmTyped";
-
-	yul::Dialect const& dialect = validDialects.at(dialectName)(m_evmVersion);
+	yul::Dialect const& dialect = validDialects.at(m_dialectName)(m_evmVersion);
 
 	if (m_sources.size() != 1)
 		BOOST_THROW_EXCEPTION(runtime_error{"Expected only one source for yul test."});
@@ -114,21 +112,15 @@ void SyntaxTest::parseAndAnalyze()
 
 }
 
-void SyntaxTest::validateSettings()
+SyntaxTest::SyntaxTest(string const& _filename, langutil::EVMVersion _evmVersion):
+	CommonSyntaxTest(_filename, _evmVersion)
 {
-	CommonSyntaxTest::validateSettings();
+	m_dialectName = m_reader.stringSetting("dialect", "evmTyped");
 
-	if (!m_settings.count("dialect"))
-		return;
-
-	string const dialect = m_settings["dialect"];
-	m_validatedSettings["dialect"] = dialect;
-	m_settings.erase("dialect");
-
-	if (!validDialects.count(dialect))
+	if (!validDialects.count(m_dialectName))
 		BOOST_THROW_EXCEPTION(runtime_error{
 			"Invalid Dialect \"" +
-			dialect +
+			m_dialectName +
 			"\". Valid dialects are " +
 			joinHumanReadable(validDialectNames(), ", ", " and ") +
 			"."
diff --git a/test/libyul/SyntaxTest.h b/test/libyul/SyntaxTest.h
index 087a6326c..8b4c24bd8 100644
--- a/test/libyul/SyntaxTest.h
+++ b/test/libyul/SyntaxTest.h
@@ -36,15 +36,13 @@ public:
 	{
 		return std::make_unique<SyntaxTest>(_config.filename, _config.evmVersion);
 	}
-	SyntaxTest(std::string const& _filename, langutil::EVMVersion _evmVersion):
-		CommonSyntaxTest(_filename, _evmVersion) {}
+	SyntaxTest(std::string const& _filename, langutil::EVMVersion _evmVersion);
 	virtual ~SyntaxTest() {}
-
-	/// Validates the settings, i.e. moves them from m_settings to m_validatedSettings.
-	/// Throws a runtime exception if any setting is left at this class (i.e. unknown setting).
-	void validateSettings() override;
 protected:
 	void parseAndAnalyze() override;
+
+private:
+	std::string m_dialectName;
 };
 
 }
diff --git a/test/libyul/YulInterpreterTest.cpp b/test/libyul/YulInterpreterTest.cpp
index f37d18383..937ffb57e 100644
--- a/test/libyul/YulInterpreterTest.cpp
+++ b/test/libyul/YulInterpreterTest.cpp
@@ -45,17 +45,11 @@ using namespace solidity::frontend;
 using namespace solidity::frontend::test;
 using namespace std;
 
-YulInterpreterTest::YulInterpreterTest(string const& _filename)
+YulInterpreterTest::YulInterpreterTest(string const& _filename):
+	EVMVersionRestrictedTestCase(_filename)
 {
-	boost::filesystem::path path(_filename);
-
-	ifstream file(_filename);
-	if (!file)
-		BOOST_THROW_EXCEPTION(runtime_error("Cannot open test case: \"" + _filename + "\"."));
-	file.exceptions(ios::badbit);
-
-	m_source = parseSourceAndSettings(file);
-	m_expectation = parseSimpleExpectations(file);
+	m_source = m_reader.source();
+	m_expectation = m_reader.simpleExpectations();
 }
 
 TestCase::TestResult YulInterpreterTest::run(ostream& _stream, string const& _linePrefix, bool const _formatted)
diff --git a/test/libyul/YulOptimizerTest.cpp b/test/libyul/YulOptimizerTest.cpp
index e488460fc..c8cb601f1 100644
--- a/test/libyul/YulOptimizerTest.cpp
+++ b/test/libyul/YulOptimizerTest.cpp
@@ -89,7 +89,8 @@ using namespace solidity::frontend;
 using namespace solidity::frontend::test;
 using namespace std;
 
-YulOptimizerTest::YulOptimizerTest(string const& _filename)
+YulOptimizerTest::YulOptimizerTest(string const& _filename):
+	EVMVersionRestrictedTestCase(_filename)
 {
 	boost::filesystem::path path(_filename);
 
@@ -97,38 +98,23 @@ YulOptimizerTest::YulOptimizerTest(string const& _filename)
 		BOOST_THROW_EXCEPTION(runtime_error("Filename path has to contain a directory: \"" + _filename + "\"."));
 	m_optimizerStep = std::prev(std::prev(path.end()))->string();
 
-	ifstream file(_filename);
-	soltestAssert(file, "Cannot open test contract: \"" + _filename + "\".");
-	file.exceptions(ios::badbit);
+	m_source = m_reader.source();
 
-	m_source = parseSourceAndSettings(file);
-	if (m_settings.count("dialect"))
-	{
-		auto dialectName = m_settings["dialect"];
-		if (dialectName == "yul")
-			m_dialect = &Dialect::yulDeprecated();
-		else if (dialectName == "ewasm")
-			m_dialect = &WasmDialect::instance();
-		else if (dialectName == "evm")
-			m_dialect = &EVMDialect::strictAssemblyForEVMObjects(solidity::test::CommonOptions::get().evmVersion());
-		else if (dialectName == "evmTyped")
-			m_dialect = &EVMDialectTyped::instance(solidity::test::CommonOptions::get().evmVersion());
-		else
-			BOOST_THROW_EXCEPTION(runtime_error("Invalid dialect " + dialectName));
-
-		m_validatedSettings["dialect"] = dialectName;
-		m_settings.erase("dialect");
-	}
-	else
+	auto dialectName = m_reader.stringSetting("dialect", "evm");
+	if (dialectName == "yul")
+		m_dialect = &Dialect::yulDeprecated();
+	else if (dialectName == "ewasm")
+		m_dialect = &WasmDialect::instance();
+	else if (dialectName == "evm")
 		m_dialect = &EVMDialect::strictAssemblyForEVMObjects(solidity::test::CommonOptions::get().evmVersion());
+	else if (dialectName == "evmTyped")
+		m_dialect = &EVMDialectTyped::instance(solidity::test::CommonOptions::get().evmVersion());
+	else
+		BOOST_THROW_EXCEPTION(runtime_error("Invalid dialect " + dialectName));
 
-	if (m_settings.count("step"))
-	{
-		m_validatedSettings["step"] = m_settings["step"];
-		m_settings.erase("step");
-	}
+	m_step = m_reader.stringSetting("step", "");
 
-	m_expectation = parseSimpleExpectations(file);
+	m_expectation = m_reader.simpleExpectations();
 }
 
 TestCase::TestResult YulOptimizerTest::run(ostream& _stream, string const& _linePrefix, bool const _formatted)
@@ -377,13 +363,13 @@ TestCase::TestResult YulOptimizerTest::run(ostream& _stream, string const& _line
 
 	m_obtainedResult = AsmPrinter{*m_dialect}(*m_ast) + "\n";
 
-	if (m_optimizerStep != m_validatedSettings["step"])
+	if (m_optimizerStep != m_step)
 	{
 		string nextIndentLevel = _linePrefix + "  ";
 		AnsiColorized(_stream, _formatted, {formatting::BOLD, formatting::CYAN}) <<
 			_linePrefix <<
 			"Invalid optimizer step. Given: \"" <<
-			m_validatedSettings["step"] <<
+			m_step <<
 			"\", should be: \"" <<
 			m_optimizerStep <<
 			"\"." <<
@@ -410,7 +396,8 @@ void YulOptimizerTest::printSource(ostream& _stream, string const& _linePrefix,
 
 void YulOptimizerTest::printUpdatedSettings(ostream& _stream, const string& _linePrefix, const bool _formatted)
 {
-	m_validatedSettings["step"] = m_optimizerStep;
+	m_step = m_optimizerStep;
+	m_reader.setSetting("step", m_step);
 	EVMVersionRestrictedTestCase::printUpdatedSettings(_stream, _linePrefix, _formatted);
 }
 
diff --git a/test/libyul/YulOptimizerTest.h b/test/libyul/YulOptimizerTest.h
index 41e38fca0..64e3cc83d 100644
--- a/test/libyul/YulOptimizerTest.h
+++ b/test/libyul/YulOptimizerTest.h
@@ -73,6 +73,7 @@ private:
 	std::string m_expectation;
 
 	Dialect const* m_dialect = nullptr;
+	std::string m_step;
 	std::set<YulString> m_reservedIdentifiers;
 	std::unique_ptr<NameDispenser> m_nameDispenser;
 	std::unique_ptr<OptimiserStepContext> m_context;
diff --git a/test/tools/CMakeLists.txt b/test/tools/CMakeLists.txt
index 5ea8486ec..c8add4ce7 100644
--- a/test/tools/CMakeLists.txt
+++ b/test/tools/CMakeLists.txt
@@ -17,6 +17,7 @@ add_executable(isoltest
 	../CommonSyntaxTest.cpp
 	../EVMHost.cpp
 	../TestCase.cpp
+	../TestCaseReader.cpp
 	../libsolidity/util/BytesUtils.cpp
 	../libsolidity/util/ContractABIUtils.cpp
 	../libsolidity/util/TestFileParser.cpp
diff --git a/test/tools/isoltest.cpp b/test/tools/isoltest.cpp
index e439aba64..da85c9ed0 100644
--- a/test/tools/isoltest.cpp
+++ b/test/tools/isoltest.cpp
@@ -161,7 +161,6 @@ TestTool::Result TestTool::process()
 			(AnsiColorized(cout, formatted, {BOLD}) << m_name << ": ").flush();
 
 			m_test = m_testCaseCreator(TestCase::Config{m_path.string(), m_options.evmVersion()});
-			m_test->validateSettings();
 			if (m_test->shouldRun())
 				switch (TestCase::TestResult result = m_test->run(outputMessages, "  ", formatted))
 				{