Test AVA using AVA

.c8rc.json

@@ -1,7 +1,7 @@
 {
 	"all": true,
 	"exclude": [
-		"{coverage,media,test-d,test-tap}/**",
+		"{coverage,media,test,test-d,test-tap}/**",
 		"*.config.js",
 		"index.d.ts"
 	],

.github/CONTRIBUTING.md

@@ -59,7 +59,7 @@ Try and avoid making breaking changes. Those take more time to ship. Instead mak
 
 Non-experimental features should be accompanied with tests and documentation.
 
-Don't include unrelated changes in your pull request. Make sure tests pass on your machine by running `npm test`. You can run specific test files as well using `npx tap test-tap/{file}.js`.
+Don't include unrelated changes in your pull request. Make sure tests pass on your machine by running `npm test`. You can run specific test files as well using `npx tap test-tap/{file}.js` or `npx test-ava test/{file}.js`.
 
 When you make a pull request please use a clear and descriptive title. Be specific about what's changed and why.
 

.gitignore

@@ -1,2 +1,5 @@
-node_modules
-coverage
+/coverage
+/media/**/node_modules/
+/node_modules/
+/test-tap/**/node_modules/
+/test/**/fixtures/**/node_modules/*/

ava.config.js

@@ -0,0 +1,4 @@
+export default {
+	files: ['test/**', '!test/**/{fixtures,helpers}/**'],
+	ignoredByWatcher: ['{coverage,docs,media,test-d,test-tap}/**']
+};

lib/cli.js

@@ -410,6 +410,19 @@ exports.run = async () => { // eslint-disable-line complexity
 	api.on('run', plan => {
 		reporter.startRun(plan);
 
+		if (process.env.AVA_EMIT_RUN_STATUS_OVER_IPC === 'I\'ll find a payphone baby / Take some time to talk to you') {
+			if (process.versions.node >= '12.16.0') {
+				plan.status.on('stateChange', evt => {
+					process.send(evt);
+				});
+			} else {
+				const v8 = require('v8');
+				plan.status.on('stateChange', evt => {
+					process.send([...v8.serialize(evt)]);
+				});
+			}
+		}
+
 		plan.status.on('stateChange', evt => {
 			if (evt.type === 'interrupt') {
 				reporter.endRun();

maintaining.md

@@ -8,6 +8,7 @@
 
 * `npm test`: Lint the code and run the entire test suite with coverage.
 * `npx tap test-tap/fork.js --bail`: Run a specific test file and bail on the first failure (useful when hunting bugs).
+* `npx test-ava test/{file}.js`: Run self-hosted tests.
 
 ## CI
 

package.json

@@ -10,7 +10,7 @@
 		"node": ">=10.18.0 <11 || >=12.14.0 <13 || >=13.5.0 <14 || >=14.0.0"
 	},
 	"scripts": {
-		"test": "xo && tsd && c8 tap"
+		"test": "xo && tsd && c8 --report=none tap && c8 --report=none --no-clean test-ava && c8 report"
 	},
 	"files": [
 		"lib",
@@ -113,6 +113,7 @@
 	},
 	"devDependencies": {
 		"@ava/babel": "^1.0.1",
+		"@ava/test": "github:avajs/test",
 		"@babel/plugin-proposal-do-expressions": "^7.8.3",
 		"@sinonjs/fake-timers": "^6.0.1",
 		"ansi-escapes": "^4.3.1",

test/README.md

@@ -0,0 +1,7 @@
+# Self-hosted tests
+
+This directory contains tests that are run using a stable version of AVA. You can run them using `npx test-ava`.
+
+Tests should be placed in their own directory, grouped by area of responsibility. Use the `exec.fixture()` helper to launch the AVA version that is in the repository to run tests. Place these in a nested `fixtures` directory. Add a relative dependency in `package.json`. You can then import from `ava`.
+
+Prefer snapshotting the test results.

test/assertions/fixtures/happy-path.js

@@ -0,0 +1,29 @@
+const test = require('ava');
+
+const passes = async (t, assertion, ...args) => {
+	await t[assertion](...args);
+};
+
+passes.title = (_, assertion, ...args) => `t.${assertion}(${args.map(v => JSON.stringify(v)).join(', ')}) passes`;
+
+test(passes, 'pass');
+test(passes, 'is', 1, 1);
+test(passes, 'not', 1, 2);
+test(passes, 'deepEqual', {foo: 'bar'}, {foo: 'bar'});
+test(passes, 'notDeepEqual', {foo: 'bar'}, {foo: 'baz'});
+test(passes, 'throws', () => {
+	throw new Error('error');
+});
+test(passes, 'throwsAsync', async () => {
+	throw new Error('error');
+});
+test(passes, 'notThrows', () => {});
+test(passes, 'notThrowsAsync', async () => {});
+test(passes, 'snapshot', {foo: 'bar'});
+test(passes, 'truthy', 1);
+test(passes, 'falsy', '');
+test(passes, 'true', true);
+test(passes, 'false', false);
+test(passes, 'regex', 'foo', /foo/);
+test(passes, 'notRegex', 'bar', /foo/);
+test(passes, 'assert', 1);

test/assertions/fixtures/happy-path.js.md

@@ -0,0 +1,13 @@
+# Snapshot report for `happy-path.js`
+
+The actual snapshot is saved in `happy-path.js.snap`.
+
+Generated by [AVA](https://avajs.dev).
+
+## t.snapshot({"foo":"bar"}) passes
+
+> Snapshot 1
+
+    {
+      foo: 'bar',
+    }

test/assertions/fixtures/package.json

@@ -0,0 +1,10 @@
+{
+  "ava": {
+    "files": [
+      "*.js"
+    ]
+  },
+  "dependencies": {
+    "ava": "file:../../.."
+  }
+}

test/assertions/snapshots/test.js.md

@@ -0,0 +1,29 @@
+# Snapshot report for `test/assertions/test.js`
+
+The actual snapshot is saved in `test.js.snap`.
+
+Generated by [AVA](https://avajs.dev).
+
+## happy path
+
+> Snapshot 1
+
+    [
+      't.assert(1) passes',
+      't.deepEqual({"foo":"bar"}, {"foo":"bar"}) passes',
+      't.false(false) passes',
+      't.falsy("") passes',
+      't.is(1, 1) passes',
+      't.not(1, 2) passes',
+      't.notDeepEqual({"foo":"bar"}, {"foo":"baz"}) passes',
+      't.notRegex("bar", {}) passes',
+      't.notThrows() passes',
+      't.notThrowsAsync() passes',
+      't.pass() passes',
+      't.regex("foo", {}) passes',
+      't.snapshot({"foo":"bar"}) passes',
+      't.throws() passes',
+      't.throwsAsync() passes',
+      't.true(true) passes',
+      't.truthy(1) passes',
+    ]

test/assertions/test.js

@@ -0,0 +1,7 @@
+const test = require('@ava/test');
+const exec = require('../helpers/exec');
+
+test('happy path', async t => {
+	const result = await exec.fixture('happy-path.js');
+	t.snapshot(result.stats.passed.map(({title}) => title));
+});

test/helpers/exec.js

@@ -0,0 +1,65 @@
+const path = require('path');
+const v8 = require('v8');
+
+const test = require('@ava/test');
+const execa = require('execa');
+
+const cliPath = path.resolve(__dirname, '../../cli.js');
+const serialization = process.versions.node >= '12.16.0' ? 'advanced' : 'json';
+
+exports.fixture = async (...args) => {
+	const cwd = path.join(path.dirname(test.meta.file), 'fixtures');
+	const running = execa.node(cliPath, args, {
+		env: {
+			AVA_EMIT_RUN_STATUS_OVER_IPC: 'I\'ll find a payphone baby / Take some time to talk to you'
+		},
+		cwd,
+		serialization
+	});
+
+	const stats = {
+		passed: []
+	};
+
+	running.on('message', message => {
+		if (serialization === 'json') {
+			message = v8.deserialize(Uint8Array.from(message));
+		}
+
+		switch (message.type) {
+			case 'test-passed': {
+				const {title, testFile} = message;
+				stats.passed.push({title, file: path.posix.relative(cwd, testFile)});
+				break;
+			}
+
+			default:
+				break;
+		}
+	});
+
+	try {
+		return {
+			stats,
+			...await running
+		};
+	} catch (error) {
+		throw Object.assign(error, {stats});
+	} finally {
+		stats.passed.sort((a, b) => {
+			if (a.file < b.file) {
+				return -1;
+			}
+
+			if (a.file > b.file) {
+				return 1;
+			}
+
+			if (a.title < b.title) {
+				return -1;
+			}
+
+			return 1;
+		});
+	}
+};