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140 lines
7.0 KiB
140 lines
7.0 KiB
# solidity-coverage
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[](https://circleci.com/gh/sc-forks/solidity-coverage)
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[](https://codecov.io/gh/sc-forks/solidity-coverage)
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[](https://waffle.io/sc-forks/solidity-coverage?utm_source=badge)
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### Code coverage for Solidity testing
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For more details about what this is, how it works and potential limitations, see
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[the accompanying article](https://blog.colony.io/code-coverage-for-solidity-eecfa88668c2).
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**solidity-coverage** is a stand-alone fork of [Solcover](https://github.com/JoinColony/solcover)
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### Install
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```
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$ npm install --save-dev solidity-coverage
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```
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### Run
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```
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$ ./node_modules/.bin/solidity-coverage
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```
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Tests run signficantly slower while coverage is being generated. A 1 to 2 minute delay
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between the end of Truffle compilation and the beginning of test execution is possible if your
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test suite is large. Large solidity files can also take a while to instrument.
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### Configuration
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By default, solidity-coverage generates a stub `truffle.js` that accomodates its special gas needs and
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connects to a modified version of testrpc on port 8555. If your tests will run on the development network
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using a standard `truffle.js` and a testrpc instance with no special options, you shouldn't have to
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do any configuration. If your tests depend on logic added to `truffle.js` - for example:
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[zeppelin-solidity](https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/truffle.js)
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uses the file to expose a babel polyfill that its suite requires - you can override the
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default behavior by declaring a coverage network in `truffle.js`. solidity-coverage will use your 'truffle.js'
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instead of a dynamically generated one.
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**Example coverage network config**
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```javascript
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module.exports = {
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networks: {
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development: {
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host: "localhost",
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port: 8545,
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network_id: "*" // Match any network id
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},
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coverage: {
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host: "localhost",
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network_id: "*",
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port: 8555, // <-- Use port 8555
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gas: 0xfffffffffff, // <-- Use this high gas value
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gasPrice: 0x01 // <-- Use this low gas price
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}
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}
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};
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```
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You can also create a `.solcover.js` config file in the root directory of your project and specify
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some additional options:
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+ **port**: {Number} The port you want solidity-coverage to run testrpc on / have truffle connect to.
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+ **testrpcOptions**: {String} A string of options to be appended to a command line invocation
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of testrpc.
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+ Example: `--account="0x89a...b1f',10000" --port 8777`".
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+ Note: you should specify the port in your `testrpcOptions` string AND as a `port` option.
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+ **testCommand**: {String} By default solidity-coverage runs `truffle test` or `truffle test --network coverage`.
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This option lets you run tests some other way: ex: `mocha --timeout 5000`. You
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will probably also need to make sure the web3 provider for your tests explicitly connects to the port solidity-coverage's
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testrpc is set to run on, e.g:
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+ `var web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8555"))`
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+ **norpc**: {Boolean} When true, solidity-coverage will not launch its own testrpc instance. This
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can be useful if you are running tests using a different vm like the
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[`sc-forks` version of `pyethereum`](https://github.com/sc-forks/pyethereum). (Default: false).
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+ **dir**: {String} : By default, solidity-coverage looks for a `contracts` folder in your root
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directory. `dir` allows you to define a relative path from the root directory to the contracts
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folder. A `dir` of `./secretDirectory` would tell solidity-coverage to look for `./secretDirectory/contracts`
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**Example .solcover.js config file**
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```javascript
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module.exports = {
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port: 6545,
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testrpcOptions: '-p 6545 -u 0x54fd80d6ae7584d8e9a19fe1df43f04e5282cc43',
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testCommand: 'mocha --timeout 5000',
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norpc: true,
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dir: './secretDirectory'
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};
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```
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### Known Issues
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**Hardcoded gas costs**: If you have hardcoded gas costs into your tests some of them may fail when using solidity-coverage.
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This is because the instrumentation process increases the gas costs for using the contracts, due to
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the extra events. If this is the case, then the coverage may be incomplete. To avoid this, using
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`estimateGas` to estimate your gas costs should be more resilient in most cases.
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**Events testing**: Because solidity-coverage injects events into your contracts to log which lines your tests reach,
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any tests that ask how many events are fired or where the event sits in the logs array
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will probably error while coverage is being generated.
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**Using `require` in `migrations.js` files**: Truffle overloads Node's `require` function but
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implements a simplified search algorithm for node_modules packages
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([see issue #383 at Truffle](https://github.com/trufflesuite/truffle/issues/383)).
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Because solidity-coverage copies an instrumented version of your project into a temporary folder, `require`
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statements handled by Truffle internally won't resolve correctly.
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**Coveralls / CodeCov**: These CI services take the Istanbul reports generated by solidity-coverage and display
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line coverage. Istanbul's own html report publishes significantly more detail and can show whether
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your tests actually reach all the conditional branches in your code. It can be found inside the
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`coverage` folder at `index.html` after you run the tool.
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### Examples
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**WARNING**: This utility is in development and its accuracy is unknown. If you
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find discrepancies between the coverage report and your suite's behavior, please open an
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[issue](https://github.com/sc-forks/solidity-coverage/issues).
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+ **metacoin**: The default truffle project
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+ [HTML reports](https://sc-forks.github.io/metacoin/)
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+ [Metacoin with solidity-coverage installed](https://github.com/sc-forks/metacoin) (simple, without configuration)
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+ **zeppelin-solidity** at commit 453a19825013a586751b87c67bebd551a252fb50
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+ [HTML reports]( https://sc-forks.github.io/zeppelin-solidity/)
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+ [Zeppelin with solidity-coverage installed](https://github.com/sc-forks/zeppelin-solidity) (declares own coverage network in truffle.js)
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+ **numeraire** at commit 5ac3fa432c6b4192468c95a66e52ca086c804c95
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+ [HTML reports](https://sc-forks.github.io/contract/)
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+ [Numeraire with solidity-coverage installed](https://github.com/sc-forks/contract) (uses .solcover.js)
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### Contribution Guidelines
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Contributions are welcome! If you're opening a PR that adds features please consider writing some
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[unit tests](https://github.com/sc-forks/solidity-coverage/tree/master/test) for them. You could
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also lint your submission with `npm run lint`. Bugs can be reported in the
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[issues](https://github.com/sc-forks/solidity-coverage/issues).
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### Contributors
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+ [@area](https://github.com/area)
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+ [@cgewecke](https://github.com/cgewecke)
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+ [@adriamb](https://github.com/adriamb)
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