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For development of Test262-harness, test authoring & execution:
git clone https://github.com/tc39/test262.git --depth 1
cd test262
For test authoring & execution:
npm install -g test262-harness
Run test262-harness --help for details on the various configuration options.
Running tests in hypothetical JavaScript engine "X":
cd test262;
test262-harness --hostType=X --hostPath=`which X` test/**/*.js
| Option Name | Description | Required | Default |
|---|---|---|---|
-h, --help
|
Show help & examples | n/a | n/a |
-v, --version
|
Print the current version of test262-harness | n/a | n/a |
--hostType |
Type of host to run tests in. See eshost's supported hosts for available options. | No | node |
--hostPath |
Path to the host executable. | Yes, if hostType is specified |
process.execPath |
--hostArgs |
Any additional arguments to pass to the host when invoking it (eg. --harmony, --es6all, etc). |
No | n/a |
-t, --threads
|
Run this many tests in parallel. Note that the browser runners don't work great with t > 1. | No | 1 |
-r, --reporter
|
Format of data written to standard output. Currently either json or simple. |
No | simple |
--features |
Comma-separated list of features to filter for. Example: --features="BigInt,Atomics". |
No | n/a |
--reporter-keys |
Comma-separated list of keys to include in output of json reporter. |
No | n/a |
--test262Dir |
Root test262 directory and is used to locate the includes directory. | No | Relative to test files |
--includesDir |
Includes directory. | No | Inferred from test262Dir or else detected by walking upward from the first test found. |
--tempDir |
Directory that eshost will create its temp files in (does not affect location of files created by --saveCompiledTests and --saveOnlyFailed
|
No | OS Temp Dir |
--prelude |
Path to a file to include before every test (useful for testing polyfills for example); supports multiple --prelude parameters |
No | n/a |
--timeout |
Set a custom test timeout in milliseconds | No | 10000 |
--transformer |
Path to module which exports a code transformer function | No | n/a |
--preprocessor |
Path to module which exports a map function that operates on each Test262Test object before it executed. | No | n/a |
--acceptVersion |
Execute tests from a version of Test262 that differs from the versions supported by this utility. This may cause the utility to report invalid test results. | No | Inferred from test262Dir/package.json
|
--saveCompiledTests |
Write the compiled version of path/to/test.js as path/to/test.js.<hostType>.<default|strict>.<pass|fail> so that it can be easily re-run under that host. Run test262-harness --help for examples. |
No | n/a |
--saveOnlyFailed |
Only save the compiled version of the test if it failed, to help easily repro failed tests (implies --saveCompiledTests). |
No | n/a |
--errorForFailures |
Return a non-zero exit code if one or more tests fail. | No | n/a |
The --preprocessor feature allows a module that exports a map function that operates on each Test262Test object (ie. the object emitted by Test262-Stream) before their execution.
test.result = Result Object
In some cases, a preprocessor may want to signal to Test262-Harness that a certain result has already been reached, and that it must not further evaluate the test. To create this signal, the preprocessor creates a result property on the Test262Test object, which will indicate to Test262-Harness that it must not evaluate the test, but instead return the value of the result property as though the test had been executed. For example, a preprocessor may attempt to transpile the value of test.contents—which may fail! In the case of failure, the preprocessor can create a result property whose value is a Result Object. This will skip the code evaluation and report the given result object.
module.exports = function(test) {
try {
test.contents = babel.transform(test.contents, options).code;
} catch (error) {
test.result = {
stderr: `${error.name}: ${error.message}\n`,
stdout: '',
error
};
}
return test;
};
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