test_runner: infinite loop when files are undefined in run()

Author: pulkit-30

lib/internal/test_runner/runner.js

@@ -487,29 +487,31 @@ function run(options = kEmptyObject) {
   }
 
   const root = createTestTree({ __proto__: null, concurrency, timeout, signal });
-  let testFiles = files ?? createTestFileList();
+  if (process.env.NODE_TEST_CONTEXT === undefined) {
+    let testFiles = files ?? createTestFileList();
 
-  if (shard) {
-    testFiles = ArrayPrototypeFilter(testFiles, (_, index) => index % shard.total === shard.index - 1);
-  }
+    if (shard) {
+      testFiles = ArrayPrototypeFilter(testFiles, (_, index) => index % shard.total === shard.index - 1);
+    }
 
-  let postRun = () => root.postRun();
-  let filesWatcher;
-  const opts = { __proto__: null, root, signal, inspectPort, testNamePatterns, only };
-  if (watch) {
-    filesWatcher = watchFiles(testFiles, opts);
-    postRun = undefined;
-  }
-  const runFiles = () => {
-    root.harness.bootstrapComplete = true;
-    return SafePromiseAllSettledReturnVoid(testFiles, (path) => {
-      const subtest = runTestFile(path, filesWatcher, opts);
-      filesWatcher?.runningSubtests.set(path, subtest);
-      return subtest;
-    });
-  };
+    let postRun = () => root.postRun();
+    let filesWatcher;
+    const opts = { __proto__: null, root, signal, inspectPort, testNamePatterns, only };
+    if (watch) {
+      filesWatcher = watchFiles(testFiles, opts);
+      postRun = undefined;
+    }
+    const runFiles = () => {
+      root.harness.bootstrapComplete = true;
+      return SafePromiseAllSettledReturnVoid(testFiles, (path) => {
+        const subtest = runTestFile(path, filesWatcher, opts);
+        filesWatcher?.runningSubtests.set(path, subtest);
+        return subtest;
+      });
+    };
 
-  PromisePrototypeThen(PromisePrototypeThen(PromiseResolve(setup?.(root)), runFiles), postRun);
+    PromisePrototypeThen(PromisePrototypeThen(PromiseResolve(setup?.(root)), runFiles), postRun);
+  }
 
   return root.reporter;
 }

test/parallel/test-runner-run.mjs

@@ -466,4 +466,37 @@ describe('require(\'node:test\').run', { concurrency: true }, () => {
         }));
     });
   });
+
+  it('should run with no files', async () => {
+    const stream = run({
+      files: undefined
+    }).compose(tap);
+    stream.on('test:fail', common.mustNotCall());
+    stream.on('test:pass', common.mustNotCall());
+
+    // eslint-disable-next-line no-unused-vars
+    for await (const _ of stream);
+  });
+
+  it('should run with no files and use spec reporter', async () => {
+    const stream = run({
+      files: undefined
+    }).compose(spec);
+    stream.on('test:fail', common.mustNotCall());
+    stream.on('test:pass', common.mustNotCall());
+
+    // eslint-disable-next-line no-unused-vars
+    for await (const _ of stream);
+  });
+
+  it('should run with no files and use dot reporter', async () => {
+    const stream = run({
+      files: undefined
+    }).compose(dot);
+    stream.on('test:fail', common.mustNotCall());
+    stream.on('test:pass', common.mustNotCall());
+
+    // eslint-disable-next-line no-unused-vars
+    for await (const _ of stream);
+  });
 });