Don't force-exit after tests have completed

Fixes #1718.

With worker threads, this seems to stop AVA from detecting that the thread has exited, causing a hang.

Also remove flush logic implemented in #1722. Let's hope that current Node.js versions are better at flushing IPC before exiting.

lib/fork.js

@@ -122,11 +122,6 @@ export default function loadFork(file, options, execArgv = process.execArgv) {
 					break;
 				}
 
-				case 'ping': {
-					send({type: 'pong'});
-					break;
-				}
-
 				default: {
 					emitStateChange(message.ava);
 				}

lib/reporters/default.js

@@ -363,6 +363,7 @@ export default class Reporter {
 	writePendingTests(evt) {
 		for (const [file, testsInFile] of evt.pendingTests) {
 			if (testsInFile.size === 0) {
+				this.lineWriter.writeLine(`Failed to exit when running ${this.relativeFile(file)}\n`);
 				continue;
 			}
 

lib/run-status.js

@@ -193,6 +193,10 @@ export default class RunStatus extends Emittery {
 
 			case 'worker-finished': {
 				stats.finishedWorkers++;
+				if (this.pendingTests.get(event.testFile)?.size === 0) {
+					this.pendingTests.delete(event.testFile);
+				}
+
 				break;
 			}
 

lib/worker/base.js

@@ -23,35 +23,26 @@ import {isRunningInThread, isRunningInChildProcess} from './utils.cjs';
 const currentlyUnhandled = setUpCurrentlyUnhandled();
 let runner;
 
+let forcingExit = false;
+
+const forceExit = () => {
+	forcingExit = true;
+	process.exit(1);
+};
+
 // Override process.exit with an undetectable replacement
 // to report when it is called from a test (which it should never be).
-const {apply} = Reflect;
-const realExit = process.exit;
-
-async function exit(code, forceSync = false) {
-	const flushing = channel.flush();
-	if (!forceSync) {
-		await flushing;
+const handleProcessExit = (target, thisArg, args) => {
+	if (!forcingExit) {
+		const error = new Error('Unexpected process.exit()');
+		Error.captureStackTrace(error, handleProcessExit);
+		channel.send({type: 'process-exit', stack: error.stack});
 	}
 
-	apply(realExit, process, [code]);
-}
-
-const handleProcessExit = (fn, receiver, args) => {
-	const error = new Error('Unexpected process.exit()');
-	Error.captureStackTrace(error, handleProcessExit);
-	channel.send({type: 'process-exit', stack: error.stack});
-
-	// Make sure to extract the code only from `args` rather than e.g. `Array.prototype`.
-	// This level of paranoia is usually unwarranted, but we're dealing with test code
-	// that has already colored outside the lines.
-	const code = args.length > 0 ? args[0] : undefined;
-
-	// Force a synchronous exit as guaranteed by the real process.exit().
-	exit(code, true);
+	target.apply(thisArg, args);
 };
 
-process.exit = new Proxy(realExit, {
+process.exit = new Proxy(process.exit, {
 	apply: handleProcessExit,
 });
 
@@ -101,7 +92,7 @@ const run = async options => {
 
 	runner.on('error', error => {
 		channel.send({type: 'internal-error', err: serializeError(error)});
-		exit(1);
+		forceExit();
 	});
 
 	runner.on('finish', async () => {
@@ -112,30 +103,35 @@ const run = async options => {
 			}
 		} catch (error) {
 			channel.send({type: 'internal-error', err: serializeError(error)});
-			exit(1);
+			forceExit();
 			return;
 		}
 
 		try {
 			await Promise.all(sharedWorkerTeardowns.map(fn => fn()));
 		} catch (error) {
 			channel.send({type: 'uncaught-exception', err: serializeError(error)});
-			exit(1);
+			forceExit();
 			return;
 		}
 
 		nowAndTimers.setImmediate(() => {
-			for (const rejection of currentlyUnhandled()) {
+			const unhandled = currentlyUnhandled();
+			if (unhandled.length === 0) {
+				return;
+			}
+
+			for (const rejection of unhandled) {
 				channel.send({type: 'unhandled-rejection', err: serializeError(rejection.reason, {testFile: options.file})});
 			}
 
-			exit(0);
+			forceExit();
 		});
 	});
 
 	process.on('uncaughtException', error => {
 		channel.send({type: 'uncaught-exception', err: serializeError(error, {testFile: options.file})});
-		exit(1);
+		forceExit();
 	});
 
 	// Store value to prevent required modules from modifying it.
@@ -248,11 +244,11 @@ const run = async options => {
 			channel.unref();
 		} else {
 			channel.send({type: 'missing-ava-import'});
-			exit(1);
+			forceExit();
 		}
 	} catch (error) {
 		channel.send({type: 'uncaught-exception', err: serializeError(error, {testFile: options.file})});
-		exit(1);
+		forceExit();
 	}
 };
 

lib/worker/channel.cjs

@@ -110,22 +110,6 @@ exports.peerFailed = selectAvaMessage(handle.channel, 'peer-failed');
 exports.send = handle.send.bind(handle);
 exports.unref = handle.unref.bind(handle);
 
-let pendingPings = Promise.resolve();
-async function flush() {
-	handle.ref();
-	const promise = pendingPings.then(async () => {
-		handle.send({type: 'ping'});
-		await selectAvaMessage(handle.channel, 'pong');
-		if (promise === pendingPings) {
-			handle.unref();
-		}
-	});
-	pendingPings = promise;
-	await promise;
-}
-
-exports.flush = flush;
-
 let channelCounter = 0;
 let messageCounter = 0;
 

test-tap/reporters/default.regular.v18.log

@@ -114,6 +114,8 @@
 
   null
 
+---tty-stream-chunk-separator
+  ✘ unhandled-rejection.cjs exited with a non-zero exit code: 1
 ---tty-stream-chunk-separator
   ─
 

test-tap/reporters/default.regular.v20.log

@@ -114,6 +114,8 @@
 
   null
 
+---tty-stream-chunk-separator
+  ✘ unhandled-rejection.cjs exited with a non-zero exit code: 1
 ---tty-stream-chunk-separator
   ─
 

test-tap/reporters/default.regular.v21.log

@@ -114,6 +114,8 @@
 
   null
 
+---tty-stream-chunk-separator
+  ✘ unhandled-rejection.cjs exited with a non-zero exit code: 1
 ---tty-stream-chunk-separator
   ─
 

test-tap/reporters/tap.regular.v18.log

@@ -246,11 +246,13 @@ not ok 27 - unhandled-rejection
     formatted: 'null'
   ...
 ---tty-stream-chunk-separator
+not ok 28 - unhandled-rejection.cjs exited with a non-zero exit code: 1
+---tty-stream-chunk-separator
 
 1..21
 # tests 20
 # pass 6
 # skip 1
-# fail 20
+# fail 21
 
 ---tty-stream-chunk-separator

test-tap/reporters/tap.regular.v20.log

@@ -246,11 +246,13 @@ not ok 27 - unhandled-rejection
     formatted: 'null'
   ...
 ---tty-stream-chunk-separator
+not ok 28 - unhandled-rejection.cjs exited with a non-zero exit code: 1
+---tty-stream-chunk-separator
 
 1..21
 # tests 20
 # pass 6
 # skip 1
-# fail 20
+# fail 21
 
 ---tty-stream-chunk-separator

test-tap/reporters/tap.regular.v21.log

@@ -246,11 +246,13 @@ not ok 27 - unhandled-rejection
     formatted: 'null'
   ...
 ---tty-stream-chunk-separator
+not ok 28 - unhandled-rejection.cjs exited with a non-zero exit code: 1
+---tty-stream-chunk-separator
 
 1..21
 # tests 20
 # pass 6
 # skip 1
-# fail 20
+# fail 21
 
 ---tty-stream-chunk-separator