[isoltest] Prints bytes result if expectations mismatch.

test/libsolidity/util/BytesUtils.cpp

@@ -205,3 +205,24 @@ string BytesUtils::formatString(bytes const& _bytes, size_t _cutOff) const
 
 	return os.str();
 }
+
+string BytesUtils::formatRawBytes(bytes const& _bytes)
+{
+	if (_bytes.empty())
+		return "[]";
+
+	stringstream os;
+	auto it = _bytes.begin();
+	for (size_t i = 0; i < _bytes.size(); i += 32)
+	{
+		bytes byteRange{it, it + 32};
+
+		os << "  " << byteRange;
+
+		it += 32;
+		if (it != _bytes.end())
+			os << endl;
+	}
+
+	return os.str();
+}

test/libsolidity/util/BytesUtils.h

@@ -91,6 +91,11 @@ public:
 	/// a hexString value.
 	static std::string formatHexString(bytes const& _bytes);
 
+	/// Returns a string representation of given _bytes. Adds a newline
+	/// every 32 bytes to increase readability.
+	/// Used to print returned bytes from function calls to the commandline.
+	static std::string formatRawBytes(bytes const& _bytes);
+
 	/// Converts \param _bytes to a soltest-compliant and human-readable
 	/// string representation of a byte array which is assumed to hold
 	/// a string value.

test/libsolidity/util/TestFunctionCall.cpp

@@ -218,6 +218,7 @@ string TestFunctionCall::formatBytesParameters(
 					" does not match the one inferred from ABI."
 				);
 			}
+	_errorReporter.warning("The call to \"" + _signature + "\" returned \n" + BytesUtils::formatRawBytes(_bytes));
 
 		/// Prints obtained result if it does not match the expectation
 		/// and prints the expected result otherwise.
@@ -289,14 +290,12 @@ string TestFunctionCall::formatRawParameters(
 	stringstream os;
 	for (auto const& param: _params)
 	{
-		if (param.format.newline)
-			os << endl << _linePrefix << "// ";
-		os << param.rawString;
-		if (&param != &_params.back())
+		if (!param.rawString.empty())
 		{
 			if (param.format.newline)
-				os << ",";
-			else
+				os << endl << _linePrefix << "// ";
+			os << param.rawString;
+			if (&param != &_params.back())
 				os << ", ";
 		}
 	}