test_runner: fix infinite loop when files are undefined in test runner

PR-URL: #51047Fixes: #48823 Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: Moshe Atlow <[email protected]> Reviewed-By: James M Snell <[email protected]>

Author: pulkit-30

lib/internal/test_runner/runner.js

@@ -531,6 +531,9 @@ function run(options){
 }
 
 constroot=createTestTree({__proto__: null, concurrency, timeout, signal });
+if(process.env.NODE_TEST_CONTEXT!==undefined){
+returnroot.reporter;
+}
 lettestFiles=files??createTestFileList();
 
 if(shard){

test/parallel/test-runner-run.mjs

@@ -458,4 +458,37 @@ describe('require(\'node:test\').run',{concurrency: true }, () =>{
 assert.deepStrictEqual(executedTestFiles.sort(),[...shardsTestsFiles].sort());
 });
 });
+
+it('should run with no files',async()=>{
+conststream=run({
+files: undefined
+}).compose(tap);
+stream.on('test:fail',common.mustNotCall());
+stream.on('test:pass',common.mustNotCall());
+
+// eslint-disable-next-line no-unused-vars
+forawait(const_ofstream);
+});
+
+it('should run with no files and use spec reporter',async()=>{
+conststream=run({
+files: undefined
+}).compose(spec);
+stream.on('test:fail',common.mustNotCall());
+stream.on('test:pass',common.mustNotCall());
+
+// eslint-disable-next-line no-unused-vars
+forawait(const_ofstream);
+});
+
+it('should run with no files and use dot reporter',async()=>{
+conststream=run({
+files: undefined
+}).compose(dot);
+stream.on('test:fail',common.mustNotCall());
+stream.on('test:pass',common.mustNotCall());
+
+// eslint-disable-next-line no-unused-vars
+forawait(const_ofstream);
+});
 });