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LibJS test262

Run the Official ECMAScript Conformance Test Suite with Ladybird's LibJS

Installation

First, clone and build the Ladybird project. To run test262, only the test262-runner Ladybird target needs to be built. From the Ladybird checkout, run:

./Meta/ladybird.sh build test262-runner

Then, in the libjs-test262 project, set up a virtual environment (optional) and install the script's dependencies:

virtualenv .venv
source .venv/bin/activate

pip3 install -r requirements.txt

Dependencies are:

  • tqdm for displaying a progress bar

Finally, clone or sync test262 itself:

./sync-test262.sh

Usage

In the below command, LADYBIRD_SOURCE_DIR should point to the Ladybird checkout. The exact path to test262-runner may vary depending on any extra options that were provided to ladybird.sh above.

./main.py --libjs-test262-runner "${LADYBIRD_SOURCE_DIR}/Build/ladybird/bin/test262-runner" --test262-root ./test262

Options

usage: main.py [-h] -j PATH [-t PATH] [-p PATTERN] [-c CONCURRENCY] [--timeout TIMEOUT] [--memory-limit MEMORY_LIMIT] [--json] [--per-file PATH] [-s | -v] [-f] [--parse-only] [--ignore IGNORE] [--forward-stderr] [--summary] [--debug]

Run the test262 ECMAScript test suite with Ladybird's LibJS

options:
  -h, --help            show this help message and exit
  -j PATH, --libjs-test262-runner PATH
                        path to the 'test262-runner' binary
  -t PATH, --test262-root PATH
                        path to the 'test262' directory
  -p PATTERN, --pattern PATTERN
                        glob pattern used for test file searching (defaults to test/**/*.js)
  -c CONCURRENCY, --concurrency CONCURRENCY
                        number of concurrent workers (defaults to number of CPU cores)
  --timeout TIMEOUT     timeout for each test run in seconds (defaults to 10)
  --memory-limit MEMORY_LIMIT
                        memory limit for each test run in megabytes (defaults to 512)
  --json                print the test results as JSON
  --per-file PATH       output per-file results to file
  -s, --silent          don't print any progress information
  -v, --verbose         print output of test runs
  -f, --fail-only       only show failed tests
  --parse-only          only parse the test files and fail/pass based on that
  --ignore IGNORE       ignore any tests matching the glob
  --forward-stderr      forward all stderr output to the stderr of the script
  --summary             only show the top level results
  --debug               enable debug logging of the runner

Results

Test results are updated for every commit to the Ladybird repository. They may be viewed here:

https://ladybirdbrowser.github.io/libjs-website/test262/