Check that functions exist in isoltest.

test/libsolidity/util/TestFunctionCall.cpp

@@ -114,6 +114,9 @@ string TestFunctionCall::format(
 		}
 		else
 		{
+			if (m_calledNonExistingFunction)
+				_errorReporter.warning("The function \"" + m_call.signature + "\" is not known to the compiler.");
+
 			bytes output = m_rawBytes;
 			bool const isFailure = m_failure;
 			result = isFailure ?
@@ -300,6 +303,7 @@ void TestFunctionCall::reset()
 {
 	m_rawBytes = bytes{};
 	m_failure = true;
+	m_calledNonExistingFunction = false;
 }
 
 bool TestFunctionCall::matchesExpectation() const

test/libsolidity/util/TestFunctionCall.h

@@ -77,6 +77,7 @@ public:
 	void reset();
 
 	FunctionCall const& call() const { return m_call; }
+	void calledNonExistingFunction() { m_calledNonExistingFunction = true; }
 	void setFailure(const bool _failure) { m_failure = _failure; }
 	void setRawBytes(const bytes _rawBytes) { m_rawBytes = _rawBytes; }
 	void setContractABI(Json::Value _contractABI) { m_contractABI = std::move(_contractABI); }
@@ -129,6 +130,8 @@ private:
 	/// JSON object which holds the contract ABI and that is used to set the output formatting
 	/// in the interactive update routine.
 	Json::Value m_contractABI;
+	/// Flags that the test failed because the called function is not known to exist on the contract.
+	bool m_calledNonExistingFunction = false;
 };
 
 }