solidity-coverage

Solidity code coverage plugin for buidler.

What

For more details about how it works and potential limitations, see the accompanying article.
solidity-coverage is also JoinColony/solcover

$ npm install --save-dev solidity-coverage

And add the following to your buidler.config.js:

usePlugin("solidity-coverage");

module.exports = {
  networks: {
    coverage: {
      url: 'http://localhost:8555'
    }
  },
}

This plugin implements a coverage task

npx buidler coverage --network coverage [options]

Option	Example	Description
testfiles	`--testfiles="test/registry/*.ts"`	Test file(s) to run. (Globs must be enclosed by quotes.)
solcoverjs	`--solcoverjs ./../.solcover.js`	Relative path from working directory to config. Useful for monorepo packages that share settings. (Path must be "./" prefixed)
network	`--network development`	Use network settings defined in the Buidler config

Options can be specified in a .solcover.js config file located in the root directory of your project.

Project Examples:

Config Example:

module.exports = {
  skipFiles: ['Routers/EtherRouter.sol']
};

Option	Type	Default	Description
silent	Boolean	false	Suppress logging output
client	Object	`require("ganache-core")`	Useful if you need a specific ganache version.
providerOptions	Object	`{ }`	ganache-core options
skipFiles	Array	`['Migrations.sol']`	Array of contracts or folders (with paths expressed relative to the `contracts` directory) that should be skipped when doing instrumentation.
istanbulFolder	String	`./coverage`	Folder location for Istanbul coverage reports.
istanbulReporter	Array	`['html', 'lcov', 'text', 'json']`	Istanbul coverage reporters
mocha	Object	`{ }`	Mocha options to merge into existing mocha config. `grep` and `invert` are useful for skipping certain tests under coverage using tags in the test descriptions.
onServerReady^*	Function		Hook run after server is launched, before the tests execute. Useful if you need to use the Oraclize bridge or have setup scripts which rely on the server's availability. More...
onCompileComplete^*	Function		Hook run after compilation completes, before tests are run. Useful if you have secondary compilation steps or need to modify built artifacts. More...
onTestsComplete^*	Function		Hook run after the tests complete, before Istanbul reports are generated. More...
onIstanbulComplete^*	Function		Hook run after the Istanbul reports are generated, before the ganache server is shut down. Useful if you need to clean resources up. More...

Coverage runs tests a little more slowly.
Coverage launches its own in-process ganache server.
You can set ganache options using the providerOptions key in your .solcover.js config.
Coverage distorts gas consumption. Tests that check exact gas consumption should be skipped.
⚠️ Contracts are compiled without optimization. Please report unexpected compilation faults to issue 417

More documentation, including FAQ and information about solidity-coverage's API is available here.