AVA automatically detects whether your CI environment supports parallel builds using ci-parallel-vars. When parallel builds support is detected, AVA sorts the all detected test files by name, and splits them into chunks. Each CI machine is assigned a chunk (subset) of the tests, and then each chunk is run in parallel.
To better distribute the tests across the machines, you can configure a custom comparator function:
ava.config.js
:
import fs from 'node:fs';
// Assuming 'test-data.json' structure is:
// {
// 'tests/test1.js': { order: 1 },
// 'tests/test2.js': { order: 0 }
// }
const testData = JSON.parse(fs.readFileSync('test-data.json', 'utf8'));
export default {
sortTestFiles: (file1, file2) => testData[file1].order - testData[file2].order,
};
Although GitHub Actions doesn't support parallel builds out-of-the-box with AVA, you can configure it manually by using a matrix:
.github/workflows/test.yml
:
on: push
jobs:
test:
strategy:
# Don't cancel test runs if one fails
fail-fast: false
# Run 4 jobs in parallel, each executing a subset of all tests
matrix:
node_index: [0, 1, 2, 3]
total_nodes: [4]
runs-on: ubuntu-latest
steps:
# Check out code and perform setup steps
# ...
- name: Test
run: npx ava
env:
CI_NODE_INDEX: ${{ matrix.node_index }}
CI_NODE_TOTAL: ${{ matrix.total_nodes }}