ens-usernames/utils/testUtils.js

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2018-04-23 04:58:58 +00:00
// This has been tested with the real Ethereum network and Testrpc.
// Copied and edited from: https://gist.github.com/xavierlepretre/d5583222fde52ddfbc58b7cfa0d2d0a9
exports.assertReverts = (contractMethodCall, maxGasAvailable) => {
return new Promise((resolve, reject) => {
try {
resolve(contractMethodCall())
} catch (error) {
reject(error)
}
})
.then(tx => {
assert.equal(tx.receipt.gasUsed, maxGasAvailable, "tx successful, the max gas available was not consumed")
})
.catch(error => {
if ((error + "").indexOf("invalid opcode") < 0 && (error + "").indexOf("out of gas") < 0) {
// Checks if the error is from TestRpc. If it is then ignore it.
// Otherwise relay/throw the error produced by the above assertion.
// Note that no error is thrown when using a real Ethereum network AND the assertion above is true.
throw error
}
})
}
exports.listenForEvent = event => new Promise((resolve, reject) => {
event({}, (error, response) => {
if (!error) {
resolve(response.args)
} else {
reject(error)
}
event.stopWatching()
})
});
exports.eventValues = (receipt, eventName) => {
if(receipt.events[eventName])
return receipt.events[eventName].returnValues;
}
exports.addressToBytes32 = (address) => {
const stringed = "0000000000000000000000000000000000000000000000000000000000000000" + address.slice(2);
return "0x" + stringed.substring(stringed.length - 64, stringed.length);
}
// OpenZeppelin's expectThrow helper -
// Source: https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/test/helpers/expectThrow.js
exports.expectThrow = async promise => {
try {
await promise;
} catch (error) {
// TODO: Check jump destination to destinguish between a throw
// and an actual invalid jump.
const invalidOpcode = error.message.search('invalid opcode') >= 0;
// TODO: When we contract A calls contract B, and B throws, instead
// of an 'invalid jump', we get an 'out of gas' error. How do
// we distinguish this from an actual out of gas event? (The
// testrpc log actually show an 'invalid jump' event.)
const outOfGas = error.message.search('out of gas') >= 0;
const revert = error.message.search('revert') >= 0;
assert(
invalidOpcode || outOfGas || revert,
'Expected throw, got \'' + error + '\' instead',
);
return;
}
assert.fail('Expected throw not received');
};
exports.assertJump = (error) => {
assert(error.message.search('revert') > -1, 'Revert should happen');
}
var callbackToResolve = function (resolve, reject) {
return function (error, value) {
if (error) {
reject(error);
} else {
resolve(value);
}
};
};
exports.promisify = (func) =>
(...args) => {
return new Promise((resolve, reject) => {
const callback = (err, data) => err ? reject(err) : resolve(data);
func.apply(this, [...args, callback]);
});
}