path: root/test/libsolidity/StandardCompiler.cpp

/*
    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/>.
*/
/**
 * @date 2017
 * Unit tests for interface/StandardCompiler.h.
 */

#include <string>
#include <boost/test/unit_test.hpp>
#include <libsolidity/interface/StandardCompiler.h>
#include <libdevcore/JSON.h>

#include "../Metadata.h"

using namespace std;
using namespace dev::eth;

namespace dev
{
namespace solidity
{
namespace test
{

namespace
{

/// Helper to match a specific error type and message
bool containsError(Json::Value const& _compilerResult, string const& _type, string const& _message)
{
    if (!_compilerResult.isMember("errors"))
        return false;

    for (auto const& error: _compilerResult["errors"])
    {
        BOOST_REQUIRE(error.isObject());
        BOOST_REQUIRE(error["type"].isString());
        BOOST_REQUIRE(error["message"].isString());
        if ((error["type"].asString() == _type) && (error["message"].asString() == _message))
            return true;
    }

    return false;
}

bool containsAtMostWarnings(Json::Value const& _compilerResult)
{
    if (!_compilerResult.isMember("errors"))
        return true;

    for (auto const& error: _compilerResult["errors"])
    {
        BOOST_REQUIRE(error.isObject());
        BOOST_REQUIRE(error["severity"].isString());
        if (error["severity"].asString() != "warning")
            return false;
    }

    return true;
}

Json::Value getContractResult(Json::Value const& _compilerResult, string const& _file, string const& _name)
{
    if (
        !_compilerResult["contracts"].isObject() ||
        !_compilerResult["contracts"][_file].isObject() ||
        !_compilerResult["contracts"][_file][_name].isObject()
    )
        return Json::Value();
    return _compilerResult["contracts"][_file][_name];
}

Json::Value compile(string const& _input)
{
    StandardCompiler compiler;
    string output = compiler.compile(_input);
    Json::Value ret;
    BOOST_REQUIRE(jsonParseStrict(output, ret));
    return ret;
}

} // end anonymous namespace

BOOST_AUTO_TEST_SUITE(StandardCompiler)

BOOST_AUTO_TEST_CASE(assume_object_input)
{
    Json::Value result;

    /// Use the native JSON interface of StandardCompiler to trigger these
    solidity::StandardCompiler compiler;
    result = compiler.compile(Json::Value());
    BOOST_CHECK(containsError(result, "JSONError", "Input is not a JSON object."));
    result = compiler.compile(Json::Value("INVALID"));
    BOOST_CHECK(containsError(result, "JSONError", "Input is not a JSON object."));

    /// Use the string interface of StandardCompiler to trigger these
    result = compile("");
    BOOST_CHECK(containsError(result, "JSONError", "* Line 1, Column 1\n  Syntax error: value, object or array expected.\n* Line 1, Column 1\n  A valid JSON document must be either an array or an object value.\n"));
    result = compile("invalid");
    BOOST_CHECK(containsError(result, "JSONError", "* Line 1, Column 1\n  Syntax error: value, object or array expected.\n* Line 1, Column 2\n  Extra non-whitespace after JSON value.\n"));
    result = compile("\"invalid\"");
    BOOST_CHECK(containsError(result, "JSONError", "* Line 1, Column 1\n  A valid JSON document must be either an array or an object value.\n"));
    BOOST_CHECK(!containsError(result, "JSONError", "* Line 1, Column 1\n  Syntax error: value, object or array expected.\n"));
    result = compile("{}");
    BOOST_CHECK(!containsError(result, "JSONError", "* Line 1, Column 1\n  Syntax error: value, object or array expected.\n"));
    BOOST_CHECK(!containsAtMostWarnings(result));
}

BOOST_AUTO_TEST_CASE(invalid_language)
{
    char const* input = R"(
    {
        "language": "INVALID"
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsError(result, "JSONError", "Only \"Solidity\" is supported as a language."));
}

BOOST_AUTO_TEST_CASE(valid_language)
{
    char const* input = R"(
    {
        "language": "Solidity"
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(!containsError(result, "JSONError", "Only \"Solidity\" is supported as a language."));
}

BOOST_AUTO_TEST_CASE(no_sources)
{
    char const* input = R"(
    {
        "language": "Solidity"
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsError(result, "JSONError", "No input sources specified."));
}

BOOST_AUTO_TEST_CASE(no_sources_empty_object)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "sources": {}
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsError(result, "JSONError", "No input sources specified."));
}

BOOST_AUTO_TEST_CASE(no_sources_empty_array)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "sources": []
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsError(result, "JSONError", "\"sources\" is not a JSON object."));
}

BOOST_AUTO_TEST_CASE(sources_is_array)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "sources": ["aa", "bb"]
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsError(result, "JSONError", "\"sources\" is not a JSON object."));
}

BOOST_AUTO_TEST_CASE(unexpected_trailing_test)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "sources": {
            "A": {
                "content": "contract A { function f() {} }"
            }
        }
    }
    }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsError(result, "JSONError", "* Line 10, Column 2\n  Extra non-whitespace after JSON value.\n"));
}


BOOST_AUTO_TEST_CASE(smoke_test)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "sources": {
            "empty": {
                "content": ""
            }
        }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsAtMostWarnings(result));
}

BOOST_AUTO_TEST_CASE(basic_compilation)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "sources": {
            "fileA": {
                "content": "contract A { }"
            }
        },
        "settings": {
            "outputSelection": {
                "fileA": {
                    "A": [ "abi", "devdoc", "userdoc", "evm.bytecode", "evm.assembly", "evm.gasEstimates", "metadata" ],
                    "": [ "legacyAST" ]
                }
            }
        }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsAtMostWarnings(result));
    Json::Value contract = getContractResult(result, "fileA", "A");
    BOOST_CHECK(contract.isObject());
    BOOST_CHECK(contract["abi"].isArray());
    BOOST_CHECK_EQUAL(dev::jsonCompactPrint(contract["abi"]), "[]");
    BOOST_CHECK(contract["devdoc"].isObject());
    BOOST_CHECK_EQUAL(dev::jsonCompactPrint(contract["devdoc"]), "{\"methods\":{}}");
    BOOST_CHECK(contract["userdoc"].isObject());
    BOOST_CHECK_EQUAL(dev::jsonCompactPrint(contract["userdoc"]), "{\"methods\":{}}");
    BOOST_CHECK(contract["evm"].isObject());
    /// @TODO check evm.methodIdentifiers, legacyAssembly, bytecode, deployedBytecode
    BOOST_CHECK(contract["evm"]["bytecode"].isObject());
    BOOST_CHECK(contract["evm"]["bytecode"]["object"].isString());
    BOOST_CHECK_EQUAL(
        dev::test::bytecodeSansMetadata(contract["evm"]["bytecode"]["object"].asString()),
        "6080604052348015600f57600080fd5b50603580601d6000396000f3006080604052600080fd00"
    );
    BOOST_CHECK(contract["evm"]["assembly"].isString());
    BOOST_CHECK(contract["evm"]["assembly"].asString().find(
        "    /* \"fileA\":0:14  contract A { } */\n  mstore(0x40, 0x80)\n  "
        "callvalue\n    /* \"--CODEGEN--\":8:17   */\n  dup1\n    "
        "/* \"--CODEGEN--\":5:7   */\n  iszero\n  tag_1\n  jumpi\n    "
        "/* \"--CODEGEN--\":30:31   */\n  0x0\n    /* \"--CODEGEN--\":27:28   */\n  "
        "dup1\n    /* \"--CODEGEN--\":20:32   */\n  revert\n    /* \"--CODEGEN--\":5:7   */\n"
        "tag_1:\n    /* \"fileA\":0:14  contract A { } */\n  pop\n  dataSize(sub_0)\n  dup1\n  "
        "dataOffset(sub_0)\n  0x0\n  codecopy\n  0x0\n  return\nstop\n\nsub_0: assembly {\n        "
        "/* \"fileA\":0:14  contract A { } */\n      mstore(0x40, 0x80)\n      0x0\n      "
        "dup1\n      revert\n\n    auxdata: 0xa165627a7a72305820"
    ) == 0);
    BOOST_CHECK(contract["evm"]["gasEstimates"].isObject());
    BOOST_CHECK_EQUAL(
        dev::jsonCompactPrint(contract["evm"]["gasEstimates"]),
        "{\"creation\":{\"codeDepositCost\":\"10600\",\"executionCost\":\"66\",\"totalCost\":\"10666\"}}"
    );
    BOOST_CHECK(contract["metadata"].isString());
    BOOST_CHECK(dev::test::isValidMetadata(contract["metadata"].asString()));
    BOOST_CHECK(result["sources"].isObject());
    BOOST_CHECK(result["sources"]["fileA"].isObject());
    BOOST_CHECK(result["sources"]["fileA"]["legacyAST"].isObject());
    BOOST_CHECK_EQUAL(
        dev::jsonCompactPrint(result["sources"]["fileA"]["legacyAST"]),
        "{\"attributes\":{\"absolutePath\":\"fileA\",\"exportedSymbols\":{\"A\":[1]}},\"children\":"
        "[{\"attributes\":{\"baseContracts\":[null],\"contractDependencies\":[null],\"contractKind\":\"contract\","
        "\"documentation\":null,\"fullyImplemented\":true,\"linearizedBaseContracts\":[1],\"name\":\"A\",\"nodes\":[null],\"scope\":2},"
        "\"id\":1,\"name\":\"ContractDefinition\",\"src\":\"0:14:0\"}],\"id\":2,\"name\":\"SourceUnit\",\"src\":\"0:14:0\"}"
    );
}

BOOST_AUTO_TEST_CASE(compilation_error)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "settings": {
            "outputSelection": {
                "fileA": {
                    "A": [
                        "abi"
                    ]
                }
            }
        },
        "sources": {
            "fileA": {
                "content": "contract A { function }"
            }
        }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(result.isMember("errors"));
    BOOST_CHECK(result["errors"].size() >= 1);
    for (auto const& error: result["errors"])
    {
        BOOST_REQUIRE(error.isObject());
        BOOST_REQUIRE(error["message"].isString());
        if (error["message"].asString().find("pre-release compiler") == string::npos)
        {
            BOOST_CHECK_EQUAL(
                dev::jsonCompactPrint(error),
                "{\"component\":\"general\",\"formattedMessage\":\"fileA:1:23: ParserError: Expected identifier but got '}'\\n"
                "contract A { function }\\n                      ^\\n\",\"message\":\"Expected identifier but got '}'\","
                "\"severity\":\"error\",\"sourceLocation\":{\"end\":23,\"file\":\"fileA\",\"start\":22},\"type\":\"ParserError\"}"
            );
        }
    }
}

BOOST_AUTO_TEST_CASE(output_selection_explicit)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "settings": {
            "outputSelection": {
                "fileA": {
                    "A": [
                        "abi"
                    ]
                }
            }
        },
        "sources": {
            "fileA": {
                "content": "contract A { }"
            }
        }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsAtMostWarnings(result));
    Json::Value contract = getContractResult(result, "fileA", "A");
    BOOST_CHECK(contract.isObject());
    BOOST_CHECK(contract["abi"].isArray());
    BOOST_CHECK_EQUAL(dev::jsonCompactPrint(contract["abi"]), "[]");
}

BOOST_AUTO_TEST_CASE(output_selection_all_contracts)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "settings": {
            "outputSelection": {
                "fileA": {
                    "*": [
                        "abi"
                    ]
                }
            }
        },
        "sources": {
            "fileA": {
                "content": "contract A { }"
            }
        }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsAtMostWarnings(result));
    Json::Value contract = getContractResult(result, "fileA", "A");
    BOOST_CHECK(contract.isObject());
    BOOST_CHECK(contract["abi"].isArray());
    BOOST_CHECK_EQUAL(dev::jsonCompactPrint(contract["abi"]), "[]");
}

BOOST_AUTO_TEST_CASE(output_selection_all_files_single_contract)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "settings": {
            "outputSelection": {
                "*": {
                    "A": [
                        "abi"
                    ]
                }
            }
        },
        "sources": {
            "fileA": {
                "content": "contract A { }"
            }
        }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsAtMostWarnings(result));
    Json::Value contract = getContractResult(result, "fileA", "A");
    BOOST_CHECK(contract.isObject());
    BOOST_CHECK(contract["abi"].isArray());
    BOOST_CHECK_EQUAL(dev::jsonCompactPrint(contract["abi"]), "[]");
}

BOOST_AUTO_TEST_CASE(output_selection_all_files_all_contracts)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "settings": {
            "outputSelection": {
                "*": {
                    "*": [
                        "abi"
                    ]
                }
            }
        },
        "sources": {
            "fileA": {
                "content": "contract A { }"
            }
        }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsAtMostWarnings(result));
    Json::Value contract = getContractResult(result, "fileA", "A");
    BOOST_CHECK(contract.isObject());
    BOOST_CHECK(contract["abi"].isArray());
    BOOST_CHECK_EQUAL(dev::jsonCompactPrint(contract["abi"]), "[]");
}

BOOST_AUTO_TEST_CASE(output_selection_dependent_contract)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "settings": {
            "outputSelection": {
                "*": {
                    "A": [
                        "abi"
                    ]
                }
            }
        },
        "sources": {
            "fileA": {
                "content": "contract B { } contract A { function f() { new B(); } }"
            }
        }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsAtMostWarnings(result));
    Json::Value contract = getContractResult(result, "fileA", "A");
    BOOST_CHECK(contract.isObject());
    BOOST_CHECK(contract["abi"].isArray());
    BOOST_CHECK_EQUAL(dev::jsonCompactPrint(contract["abi"]), "[{\"constant\":false,\"inputs\":[],\"name\":\"f\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"}]");
}

BOOST_AUTO_TEST_CASE(output_selection_dependent_contract_with_import)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "settings": {
            "outputSelection": {
                "*": {
                    "A": [
                        "abi"
                    ]
                }
            }
        },
        "sources": {
            "fileA": {
                "content": "import \"fileB\"; contract A { function f() { new B(); } }"
            },
            "fileB": {
                "content": "contract B { }"
            }
        }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsAtMostWarnings(result));
    Json::Value contract = getContractResult(result, "fileA", "A");
    BOOST_CHECK(contract.isObject());
    BOOST_CHECK(contract["abi"].isArray());
    BOOST_CHECK_EQUAL(dev::jsonCompactPrint(contract["abi"]), "[{\"constant\":false,\"inputs\":[],\"name\":\"f\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"}]");
}

BOOST_AUTO_TEST_CASE(filename_with_colon)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "settings": {
            "outputSelection": {
                "http://github.com/ethereum/solidity/std/StandardToken.sol": {
                    "A": [
                        "abi"
                    ]
                }
            }
        },
        "sources": {
            "http://github.com/ethereum/solidity/std/StandardToken.sol": {
                "content": "contract A { }"
            }
        }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsAtMostWarnings(result));
    Json::Value contract = getContractResult(result, "http://github.com/ethereum/solidity/std/StandardToken.sol", "A");
    BOOST_CHECK(contract.isObject());
    BOOST_CHECK(contract["abi"].isArray());
    BOOST_CHECK_EQUAL(dev::jsonCompactPrint(contract["abi"]), "[]");
}

BOOST_AUTO_TEST_CASE(library_filename_with_colon)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "settings": {
            "outputSelection": {
                "fileA": {
                    "A": [
                        "evm.bytecode"
                    ]
                }
            }
        },
        "sources": {
            "fileA": {
                "content": "import \"git:library.sol\"; contract A { function f() returns (uint) { return L.g(); } }"
            },
            "git:library.sol": {
                "content": "library L { function g() returns (uint) { return 1; } }"
            }
        }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsAtMostWarnings(result));
    Json::Value contract = getContractResult(result, "fileA", "A");
    BOOST_CHECK(contract.isObject());
    BOOST_CHECK(contract["evm"]["bytecode"].isObject());
    BOOST_CHECK(contract["evm"]["bytecode"]["linkReferences"].isObject());
    BOOST_CHECK(contract["evm"]["bytecode"]["linkReferences"]["git:library.sol"].isObject());
    BOOST_CHECK(contract["evm"]["bytecode"]["linkReferences"]["git:library.sol"]["L"].isArray());
    BOOST_CHECK(contract["evm"]["bytecode"]["linkReferences"]["git:library.sol"]["L"][0].isObject());
}

BOOST_AUTO_TEST_CASE(libraries_invalid_top_level)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "settings": {
            "libraries": "42"
        },
        "sources": {
            "empty": {
                "content": ""
            }
        }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsError(result, "JSONError", "\"libraries\" is not a JSON object."));
}

BOOST_AUTO_TEST_CASE(libraries_invalid_entry)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "settings": {
            "libraries": {
                "L": "42"
            }
        },
        "sources": {
            "empty": {
                "content": ""
            }
        }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsError(result, "JSONError", "library entry is not a JSON object."));
}

BOOST_AUTO_TEST_CASE(libraries_invalid_hex)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "settings": {
            "libraries": {
                "library.sol": {
                    "L": "0x4200000000000000000000000000000000000xx1"
                }
            }
        },
        "sources": {
            "empty": {
                "content": ""
            }
        }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsError(result, "JSONError", "Invalid library address (\"0x4200000000000000000000000000000000000xx1\") supplied."));
}

BOOST_AUTO_TEST_CASE(libraries_invalid_length)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "settings": {
            "libraries": {
                "library.sol": {
                    "L1": "0x42",
                    "L2": "0x4200000000000000000000000000000000000001ff"
                }
            }
        },
        "sources": {
            "empty": {
                "content": ""
            }
        }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsError(result, "JSONError", "Library address is of invalid length."));
}

BOOST_AUTO_TEST_CASE(libraries_missing_hex_prefix)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "settings": {
            "libraries": {
                "library.sol": {
                    "L": "4200000000000000000000000000000000000001"
                }
            }
        },
        "sources": {
            "empty": {
                "content": ""
            }
        }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsError(result, "JSONError", "Library address is not prefixed with \"0x\"."));
}

BOOST_AUTO_TEST_CASE(library_linking)
{
    char const* input = R"(
    {
        "language": "Solidity",
        "settings": {
            "libraries": {
                "library.sol": {
                    "L": "0x4200000000000000000000000000000000000001"
                }
            },
            "outputSelection": {
                "fileA": {
                    "A": [
                        "evm.bytecode"
                    ]
                }
            }
        },
        "sources": {
            "fileA": {
                "content": "import \"library.sol\"; import \"library2.sol\"; contract A { function f() returns (uint) { L2.g(); return L.g(); } }"
            },
            "library.sol": {
                "content": "library L { function g() returns (uint) { return 1; } }"
            },
            "library2.sol": {
                "content": "library L2 { function g() { } }"
            }
        }
    }
    )";
    Json::Value result = compile(input);
    BOOST_CHECK(containsAtMostWarnings(result));
    Json::Value contract = getContractResult(result, "fileA", "A");
    BOOST_CHECK(contract.isObject());
    BOOST_CHECK(contract["evm"]["bytecode"].isObject());
    BOOST_CHECK(contract["evm"]["bytecode"]["linkReferences"].isObject());
    BOOST_CHECK(!contract["evm"]["bytecode"]["linkReferences"]["library.sol"].isObject());
    BOOST_CHECK(contract["evm"]["bytecode"]["linkReferences"]["library2.sol"].isObject());
    BOOST_CHECK(contract["evm"]["bytecode"]["linkReferences"]["library2.sol"]["L2"].isArray());
    BOOST_CHECK(contract["evm"]["bytecode"]["linkReferences"]["library2.sol"]["L2"][0].isObject());
}

BOOST_AUTO_TEST_CASE(evm_version)
{
    auto inputForVersion = [](string const& _version)
    {
        return R"(
            {
                "language": "Solidity",
                "sources": { "fileA": { "content": "contract A { }" } },
                "settings": {
                    )" + _version + R"(
                    "outputSelection": {
                        "fileA": {
                            "A": [ "metadata" ]
                        }
                    }
                }
            }
        )";
    };
    Json::Value result;
    result = compile(inputForVersion("\"evmVersion\": \"homestead\","));
    BOOST_CHECK(result["contracts"]["fileA"]["A"]["metadata"].asString().find("\"evmVersion\":\"homestead\"") != string::npos);
    result = compile(inputForVersion("\"evmVersion\": \"tangerineWhistle\","));
    BOOST_CHECK(result["contracts"]["fileA"]["A"]["metadata"].asString().find("\"evmVersion\":\"tangerineWhistle\"") != string::npos);
    result = compile(inputForVersion("\"evmVersion\": \"spuriousDragon\","));
    BOOST_CHECK(result["contracts"]["fileA"]["A"]["metadata"].asString().find("\"evmVersion\":\"spuriousDragon\"") != string::npos);
    result = compile(inputForVersion("\"evmVersion\": \"byzantium\","));
    BOOST_CHECK(result["contracts"]["fileA"]["A"]["metadata"].asString().find("\"evmVersion\":\"byzantium\"") != string::npos);
    result = compile(inputForVersion("\"evmVersion\": \"constantinople\","));
    BOOST_CHECK(result["contracts"]["fileA"]["A"]["metadata"].asString().find("\"evmVersion\":\"constantinople\"") != string::npos);
    // test default
    result = compile(inputForVersion(""));
    BOOST_CHECK(result["contracts"]["fileA"]["A"]["metadata"].asString().find("\"evmVersion\":\"byzantium\"") != string::npos);
    // test invalid
    result = compile(inputForVersion("\"evmVersion\": \"invalid\","));
    BOOST_CHECK(result["errors"][0]["message"].asString() == "Invalid EVM version requested.");
}


BOOST_AUTO_TEST_SUITE_END()

}
}
} // end namespaces