Files specified in this way should contain one or more suites, tests or hooks. If this is not the case, consider --require instead. Explicitly ignore exclude one or more test files, directories or globs e. You cannot use --require to set hooks. If you want to set hooks to run, e. There is no separate --import flag. Sort test files by absolute path using Array.
The --watch-files and --watch-ignore options can be used to control which files are watched for changes. List of paths or globs to watch when --watch is set. If a file matching the given glob changes or is added or removed mocha will rerun all tests. The option accepts a comma-delimited list: --watch-files a,b is equivalent to --watch-files a --watch-files b. List of paths or globs to exclude from watching. The option accepts a comma-delimited list: --watch-ignore a,b is equivalent to --watch-ignore a --watch-ignore b.
Cause Mocha to only run tests matching the given regexp , which is internally compiled to a RegExp. The same goes for any other part of a suite or test-case title, --grep users would be valid as well, or even --grep GET. And another option with double quotes: --grep "groupA groupB". Some shells as e. Read more about running tests in parallel. Hint: Use --jobs 0 or --jobs 1 to temporarily disable --parallel. The mocha executable supports all applicable flags which the node executable supports.
New in v9. If the --enable-source-maps flag is passed to mocha, source maps will be collected and used to provide accurate stack traces for transpiled code:. Prepend --v8- to any flag listed in the output of node --v8-options excluding --v8-options itself to use it. Depending on the number and nature of your tests, you may find a significant performance benefit when running tests in parallel using the --parallel flag.
Parallel tests should work out-of-the box for many use cases. However, you must be aware of some important implications of the behavior. These reporters expect Mocha to know how many tests it plans to run before execution.
This information is unavailable in parallel mode, as test files are loaded only when they are about to be run. In parallel mode, reporter output is buffered ; reporting will occur after each file is completed.
You cannot use it. This is for the same reason as the incompatible reporters noted above: in parallel mode, Mocha does not load all files and suites into memory before running tests. TIP: If parallel mode is defined in your config file, you can temporarily disable it on the command-line by using either the --no-parallel flag or reducing the job count, e.
In parallel mode, Mocha does not guarantee the order in which test files will run, nor which worker process runs them. Because of this, the following options, which depend on order, cannot be used in parallel mode:. Running tests in parallel mode will naturally use more system resources. The OS may take extra time to schedule and complete some operations, depending on system load.
For this reason, the timeouts of individual tests may need to be increased either globally or otherwise.
When used with --bail or this. Mocha must shut down its worker processes before exiting. Likewise, subprocesses may throw uncaught exceptions. A root hook is a hook in a test file which is not defined within a suite. An example using the bdd interface:. When Mocha runs in parallel mode, test files do not share the same process, nor do they share the same instance of Mocha. Consequently, a hypothetical root hook defined in test file A will not be present in test file B. If you need to run some code once and only once , use a global fixture instead.
Third-party reporters may encounter issues when attempting to access non-existent properties within Test , Suite , and Hook objects. If a third-party reporter does not work in parallel mode but otherwise works in serial mode , please file an issue. Some types of tests are not so well-suited to run in parallel. Free-tier cloud CI services may not provide a suitable multi-core container or VM for their build agents. Regarding expected performance gains in CI: your mileage may vary.
It may help to use a conditional in a. CI , and adjust the job count as appropriate. In some cases, you may want a hook before or after every test in every file. These are called root hooks. Previous to v8. This still works in v8. For that reason, running root hooks using this method is strongly discouraged , and may be deprecated in the future.
In browsers you can set root hooks directly via a rootHooks object: mocha. A Root Hook Plugin file is a script which exports via module. Root hooks work with any interface, but the property names do not change. In other words, if you are using the tdd interface, suiteSetup maps to beforeAll , and setup maps to beforeEach. Tip: If you need to ensure code runs once and only once in any mode, use global fixtures. If you need to perform some logic—such as choosing a root hook conditionally, based on the environment— mochaHooks can be a function which returns the expected object.
If you need to perform an async operation, mochaHooks can be Promise -returning:. Multiple root hook plugins can be registered by using --require multiple times. For example, to register the root hooks in hooks-a. These will be registered and run in order. To contact Flat it type foundry or Ryoichi Tsunekawa with any questions, comments, etc. Mocha Mattari Free Download.
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