diff --git a/doc/api/test.md b/doc/api/test.md
index 196e854eb9c0a9..fcffd932df53c1 100644
--- a/doc/api/test.md
+++ b/doc/api/test.md
@@ -316,6 +316,35 @@ Otherwise, the test is considered to be a failure. Test files must be
 executable by Node.js, but are not required to use the `node:test` module
 internally.
 
+## `run([options])`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+* `options` {Object} Configuration options for running tests. The following
+  properties are supported:
+  * `concurrency` {number|boolean} If a number is provided,
+    then that many files would run in parallel.
+    If truthy, it would run (number of cpu cores - 1)
+    files in parallel.
+    If falsy, it would only run one file at a time.
+    If unspecified, subtests inherit this value from their parent.
+    **Default:** `true`.
+  * `files`: {Array} An array containing the list of files to run.
+    **Default** matching files from [test runner execution model][].
+  * `signal` {AbortSignal} Allows aborting an in-progress test execution.
+  * `timeout` {number} A number of milliseconds the test execution will
+    fail after.
+    If unspecified, subtests inherit this value from their parent.
+    **Default:** `Infinity`.
+* Returns: {TapStream}
+
+```js
+run({ files: [path.resolve('./tests/test.js')] })
+  .pipe(process.stdout);
+```
+
 ## `test([name][, options][, fn])`
 
 <!-- YAML
@@ -560,6 +589,47 @@ describe('tests', async () => {
 });
 ```
 
+## Class: `TapStream`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+* Extends {ReadableStream}
+
+A successful call to [`run()`][] method will return a new {TapStream}
+object, streaming a [TAP][] output
+`TapStream` will emit events, in the order of the tests definition
+
+### Event: `'test:diagnostic'`
+
+* `message` {string} The diagnostic message.
+
+Emitted when [`context.diagnostic`][] is called.
+
+### Event: `'test:fail'`
+
+* `data` {Object}
+  * `duration` {number} The test duration.
+  * `error` {Error} The failure casing test to fail.
+  * `name` {string} The test name.
+  * `testNumber` {number} The ordinal number of the test.
+  * `todo` {string|undefined} Present if [`context.todo`][] is called
+  * `skip` {string|undefined} Present if [`context.skip`][] is called
+
+Emitted when a test fails.
+
+### Event: `'test:pass'`
+
+* `data` {Object}
+  * `duration` {number} The test duration.
+  * `name` {string} The test name.
+  * `testNumber` {number} The ordinal number of the test.
+  * `todo` {string|undefined} Present if [`context.todo`][] is called
+  * `skip` {string|undefined} Present if [`context.skip`][] is called
+
+Emitted when a test passes.
+
 ## Class: `TestContext`
 
 <!-- YAML
@@ -825,6 +895,10 @@ added: v16.17.0
 [`--test`]: cli.md#--test
 [`SuiteContext`]: #class-suitecontext
 [`TestContext`]: #class-testcontext
+[`context.diagnostic`]: #contextdiagnosticmessage
+[`context.skip`]: #contextskipmessage
+[`context.todo`]: #contexttodomessage
+[`run()`]: #runoptions
 [`test()`]: #testname-options-fn
 [describe options]: #describename-options-fn
 [it options]: #testname-options-fn
diff --git a/lib/internal/main/test_runner.js b/lib/internal/main/test_runner.js
index c1066cfca35323..c965a6a95fbab5 100644
--- a/lib/internal/main/test_runner.js
+++ b/lib/internal/main/test_runner.js
@@ -1,146 +1,14 @@
 'use strict';
-const {
-  ArrayFrom,
-  ArrayPrototypeFilter,
-  ArrayPrototypeIncludes,
-  ArrayPrototypeJoin,
-  ArrayPrototypePush,
-  ArrayPrototypeSlice,
-  ArrayPrototypeSort,
-  SafePromiseAll,
-  SafeSet,
-} = primordials;
 const {
   prepareMainThreadExecution,
 } = require('internal/bootstrap/pre_execution');
-const { spawn } = require('child_process');
-const { readdirSync, statSync } = require('fs');
-const console = require('internal/console/global');
-const {
-  codes: {
-    ERR_TEST_FAILURE,
-  },
-} = require('internal/errors');
-const { test } = require('internal/test_runner/harness');
-const { kSubtestsFailed } = require('internal/test_runner/test');
-const {
-  isSupportedFileType,
-  doesPathMatchFilter,
-} = require('internal/test_runner/utils');
-const { basename, join, resolve } = require('path');
-const { once } = require('events');
-const kFilterArgs = ['--test'];
+const { run } = require('internal/test_runner/runner');
 
 prepareMainThreadExecution(false);
 markBootstrapComplete();
 
-// TODO(cjihrig): Replace this with recursive readdir once it lands.
-function processPath(path, testFiles, options) {
-  const stats = statSync(path);
-
-  if (stats.isFile()) {
-    if (options.userSupplied ||
-        (options.underTestDir && isSupportedFileType(path)) ||
-        doesPathMatchFilter(path)) {
-      testFiles.add(path);
-    }
-  } else if (stats.isDirectory()) {
-    const name = basename(path);
-
-    if (!options.userSupplied && name === 'node_modules') {
-      return;
-    }
-
-    // 'test' directories get special treatment. Recursively add all .js,
-    // .cjs, and .mjs files in the 'test' directory.
-    const isTestDir = name === 'test';
-    const { underTestDir } = options;
-    const entries = readdirSync(path);
-
-    if (isTestDir) {
-      options.underTestDir = true;
-    }
-
-    options.userSupplied = false;
-
-    for (let i = 0; i < entries.length; i++) {
-      processPath(join(path, entries[i]), testFiles, options);
-    }
-
-    options.underTestDir = underTestDir;
-  }
-}
-
-function createTestFileList() {
-  const cwd = process.cwd();
-  const hasUserSuppliedPaths = process.argv.length > 1;
-  const testPaths = hasUserSuppliedPaths ?
-    ArrayPrototypeSlice(process.argv, 1) : [cwd];
-  const testFiles = new SafeSet();
-
-  try {
-    for (let i = 0; i < testPaths.length; i++) {
-      const absolutePath = resolve(testPaths[i]);
-
-      processPath(absolutePath, testFiles, { userSupplied: true });
-    }
-  } catch (err) {
-    if (err?.code === 'ENOENT') {
-      console.error(`Could not find '${err.path}'`);
-      process.exit(1);
-    }
-
-    throw err;
-  }
-
-  return ArrayPrototypeSort(ArrayFrom(testFiles));
-}
-
-function filterExecArgv(arg) {
-  return !ArrayPrototypeIncludes(kFilterArgs, arg);
-}
-
-function runTestFile(path) {
-  return test(path, async (t) => {
-    const args = ArrayPrototypeFilter(process.execArgv, filterExecArgv);
-    ArrayPrototypePush(args, path);
-
-    const child = spawn(process.execPath, args, { signal: t.signal, encoding: 'utf8' });
-    // TODO(cjihrig): Implement a TAP parser to read the child's stdout
-    // instead of just displaying it all if the child fails.
-    let err;
-
-    child.on('error', (error) => {
-      err = error;
-    });
-
-    const { 0: { 0: code, 1: signal }, 1: stdout, 2: stderr } = await SafePromiseAll([
-      once(child, 'exit', { signal: t.signal }),
-      child.stdout.toArray({ signal: t.signal }),
-      child.stderr.toArray({ signal: t.signal }),
-    ]);
-
-    if (code !== 0 || signal !== null) {
-      if (!err) {
-        err = new ERR_TEST_FAILURE('test failed', kSubtestsFailed);
-        err.exitCode = code;
-        err.signal = signal;
-        err.stdout = ArrayPrototypeJoin(stdout, '');
-        err.stderr = ArrayPrototypeJoin(stderr, '');
-        // The stack will not be useful since the failures came from tests
-        // in a child process.
-        err.stack = undefined;
-      }
-
-      throw err;
-    }
-  });
-}
-
-(async function main() {
-  const testFiles = createTestFileList();
-
-  for (let i = 0; i < testFiles.length; i++) {
-    runTestFile(testFiles[i]);
-  }
-})();
+const tapStream = run();
+tapStream.pipe(process.stdout);
+tapStream.once('test:fail', () => {
+  process.exitCode = 1;
+});
diff --git a/lib/internal/test_runner/harness.js b/lib/internal/test_runner/harness.js
index 360fe141fe70a1..62d26a1a1bd8bf 100644
--- a/lib/internal/test_runner/harness.js
+++ b/lib/internal/test_runner/harness.js
@@ -1,8 +1,8 @@
 'use strict';
 const {
   ArrayPrototypeForEach,
-  FunctionPrototypeBind,
   SafeMap,
+  SafeWeakSet,
 } = primordials;
 const {
   createHook,
@@ -13,13 +13,18 @@ const {
     ERR_TEST_FAILURE,
   },
 } = require('internal/errors');
+const { kEmptyObject } = require('internal/util');
 const { getOptionValue } = require('internal/options');
 const { kCancelledByParent, Test, ItTest, Suite } = require('internal/test_runner/test');
+const { bigint: hrtime } = process.hrtime;
 
-const isTestRunner = getOptionValue('--test');
+const isTestRunnerCli = getOptionValue('--test');
 const testResources = new SafeMap();
-const root = new Test({ __proto__: null, name: '<root>' });
-let wasRootSetup = false;
+const wasRootSetup = new SafeWeakSet();
+
+function createTestTree(options = kEmptyObject) {
+  return setup(new Test({ __proto__: null, ...options, name: '<root>' }));
+}
 
 function createProcessEventHandler(eventName, rootTest) {
   return (err) => {
@@ -48,7 +53,7 @@ function createProcessEventHandler(eventName, rootTest) {
 }
 
 function setup(root) {
-  if (wasRootSetup) {
+  if (wasRootSetup.has(root)) {
     return root;
   }
   const hook = createHook({
@@ -81,52 +86,9 @@ function setup(root) {
       'Promise resolution is still pending but the event loop has already resolved',
       kCancelledByParent));
 
-    let passCount = 0;
-    let failCount = 0;
-    let skipCount = 0;
-    let todoCount = 0;
-    let cancelledCount = 0;
-
-    for (let i = 0; i < root.subtests.length; i++) {
-      const test = root.subtests[i];
-
-      // Check SKIP and TODO tests first, as those should not be counted as
-      // failures.
-      if (test.skipped) {
-        skipCount++;
-      } else if (test.isTodo) {
-        todoCount++;
-      } else if (test.cancelled) {
-        cancelledCount++;
-      } else if (!test.passed) {
-        failCount++;
-      } else {
-        passCount++;
-      }
-    }
-
-    root.reporter.plan(root.indent, root.subtests.length);
-
-    for (let i = 0; i < root.diagnostics.length; i++) {
-      root.reporter.diagnostic(root.indent, root.diagnostics[i]);
-    }
-
-    root.reporter.diagnostic(root.indent, `tests ${root.subtests.length}`);
-    root.reporter.diagnostic(root.indent, `pass ${passCount}`);
-    root.reporter.diagnostic(root.indent, `fail ${failCount}`);
-    root.reporter.diagnostic(root.indent, `cancelled ${cancelledCount}`);
-    root.reporter.diagnostic(root.indent, `skipped ${skipCount}`);
-    root.reporter.diagnostic(root.indent, `todo ${todoCount}`);
-    root.reporter.diagnostic(root.indent, `duration_ms ${process.uptime()}`);
-
-    root.reporter.push(null);
     hook.disable();
     process.removeListener('unhandledRejection', rejectionHandler);
     process.removeListener('uncaughtException', exceptionHandler);
-
-    if (failCount > 0 || cancelledCount > 0) {
-      process.exitCode = 1;
-    }
   };
 
   const terminationHandler = () => {
@@ -137,29 +99,41 @@ function setup(root) {
   process.on('uncaughtException', exceptionHandler);
   process.on('unhandledRejection', rejectionHandler);
   process.on('beforeExit', exitHandler);
-  // TODO(MoLow): Make it configurable to hook when isTestRunner === false.
-  if (isTestRunner) {
+  // TODO(MoLow): Make it configurable to hook when isTestRunnerCli === false.
+  if (isTestRunnerCli) {
     process.on('SIGINT', terminationHandler);
     process.on('SIGTERM', terminationHandler);
   }
 
-  root.reporter.pipe(process.stdout);
+  root.startTime = hrtime();
   root.reporter.version();
 
-  wasRootSetup = true;
+  wasRootSetup.add(root);
   return root;
 }
 
+let globalRoot;
+function getGlobalRoot() {
+  if (!globalRoot) {
+    globalRoot = createTestTree();
+    globalRoot.reporter.pipe(process.stdout);
+    globalRoot.reporter.once('test:fail', () => {
+      process.exitCode = 1;
+    });
+  }
+  return globalRoot;
+}
+
 function test(name, options, fn) {
-  const subtest = setup(root).createSubtest(Test, name, options, fn);
+  const subtest = getGlobalRoot().createSubtest(Test, name, options, fn);
   return subtest.start();
 }
 
 function runInParentContext(Factory) {
   function run(name, options, fn, overrides) {
-    const parent = testResources.get(executionAsyncId()) || setup(root);
+    const parent = testResources.get(executionAsyncId()) || getGlobalRoot();
     const subtest = parent.createSubtest(Factory, name, options, fn, overrides);
-    if (parent === root) {
+    if (parent === getGlobalRoot()) {
       subtest.start();
     }
   }
@@ -178,13 +152,14 @@ function runInParentContext(Factory) {
 
 function hook(hook) {
   return (fn, options) => {
-    const parent = testResources.get(executionAsyncId()) || setup(root);
+    const parent = testResources.get(executionAsyncId()) || getGlobalRoot();
     parent.createHook(hook, fn, options);
   };
 }
 
 module.exports = {
-  test: FunctionPrototypeBind(test, root),
+  createTestTree,
+  test,
   describe: runInParentContext(Suite),
   it: runInParentContext(ItTest),
   before: hook('before'),
diff --git a/lib/internal/test_runner/runner.js b/lib/internal/test_runner/runner.js
new file mode 100644
index 00000000000000..a4afbcb0a7710f
--- /dev/null
+++ b/lib/internal/test_runner/runner.js
@@ -0,0 +1,163 @@
+'use strict';
+const {
+  ArrayFrom,
+  ArrayPrototypeConcat,
+  ArrayPrototypeFilter,
+  ArrayPrototypeIncludes,
+  ArrayPrototypeJoin,
+  ArrayPrototypeSlice,
+  ArrayPrototypeSort,
+  ObjectAssign,
+  PromisePrototypeThen,
+  SafePromiseAll,
+  SafeSet,
+} = primordials;
+
+const { spawn } = require('child_process');
+const { readdirSync, statSync } = require('fs');
+const console = require('internal/console/global');
+const {
+  codes: {
+    ERR_TEST_FAILURE,
+  },
+} = require('internal/errors');
+const { validateArray } = require('internal/validators');
+const { kEmptyObject } = require('internal/util');
+const { createTestTree } = require('internal/test_runner/harness');
+const { kSubtestsFailed, Test } = require('internal/test_runner/test');
+const {
+  isSupportedFileType,
+  doesPathMatchFilter,
+} = require('internal/test_runner/utils');
+const { basename, join, resolve } = require('path');
+const { once } = require('events');
+
+const kFilterArgs = ['--test'];
+
+// TODO(cjihrig): Replace this with recursive readdir once it lands.
+function processPath(path, testFiles, options) {
+  const stats = statSync(path);
+
+  if (stats.isFile()) {
+    if (options.userSupplied ||
+        (options.underTestDir && isSupportedFileType(path)) ||
+        doesPathMatchFilter(path)) {
+      testFiles.add(path);
+    }
+  } else if (stats.isDirectory()) {
+    const name = basename(path);
+
+    if (!options.userSupplied && name === 'node_modules') {
+      return;
+    }
+
+    // 'test' directories get special treatment. Recursively add all .js,
+    // .cjs, and .mjs files in the 'test' directory.
+    const isTestDir = name === 'test';
+    const { underTestDir } = options;
+    const entries = readdirSync(path);
+
+    if (isTestDir) {
+      options.underTestDir = true;
+    }
+
+    options.userSupplied = false;
+
+    for (let i = 0; i < entries.length; i++) {
+      processPath(join(path, entries[i]), testFiles, options);
+    }
+
+    options.underTestDir = underTestDir;
+  }
+}
+
+function createTestFileList() {
+  const cwd = process.cwd();
+  const hasUserSuppliedPaths = process.argv.length > 1;
+  const testPaths = hasUserSuppliedPaths ?
+    ArrayPrototypeSlice(process.argv, 1) : [cwd];
+  const testFiles = new SafeSet();
+
+  try {
+    for (let i = 0; i < testPaths.length; i++) {
+      const absolutePath = resolve(testPaths[i]);
+
+      processPath(absolutePath, testFiles, { userSupplied: true });
+    }
+  } catch (err) {
+    if (err?.code === 'ENOENT') {
+      console.error(`Could not find '${err.path}'`);
+      process.exit(1);
+    }
+
+    throw err;
+  }
+
+  return ArrayPrototypeSort(ArrayFrom(testFiles));
+}
+
+function filterExecArgv(arg) {
+  return !ArrayPrototypeIncludes(kFilterArgs, arg);
+}
+
+function runTestFile(path, root) {
+  const subtest = root.createSubtest(Test, path, async (t) => {
+    const args = ArrayPrototypeConcat(
+      ArrayPrototypeFilter(process.execArgv, filterExecArgv),
+      path);
+
+    const child = spawn(process.execPath, args, { signal: t.signal, encoding: 'utf8' });
+    // TODO(cjihrig): Implement a TAP parser to read the child's stdout
+    // instead of just displaying it all if the child fails.
+    let err;
+
+    child.on('error', (error) => {
+      err = error;
+    });
+
+    const { 0: { 0: code, 1: signal }, 1: stdout, 2: stderr } = await SafePromiseAll([
+      once(child, 'exit', { signal: t.signal }),
+      child.stdout.toArray({ signal: t.signal }),
+      child.stderr.toArray({ signal: t.signal }),
+    ]);
+
+    if (code !== 0 || signal !== null) {
+      if (!err) {
+        err = ObjectAssign(new ERR_TEST_FAILURE('test failed', kSubtestsFailed), {
+          __proto__: null,
+          exitCode: code,
+          signal: signal,
+          stdout: ArrayPrototypeJoin(stdout, ''),
+          stderr: ArrayPrototypeJoin(stderr, ''),
+          // The stack will not be useful since the failures came from tests
+          // in a child process.
+          stack: undefined,
+        });
+      }
+
+      throw err;
+    }
+  });
+  return subtest.start();
+}
+
+function run(options) {
+  if (options === null || typeof options !== 'object') {
+    options = kEmptyObject;
+  }
+  const { concurrency, timeout, signal, files } = options;
+
+  if (files != null) {
+    validateArray(files, 'options.files');
+  }
+
+  const root = createTestTree({ concurrency, timeout, signal });
+  const testFiles = files ?? createTestFileList();
+
+  PromisePrototypeThen(SafePromiseAll(testFiles, (path) => runTestFile(path, root)),
+                       () => root.postRun());
+
+  return root.reporter;
+}
+
+module.exports = { run };
diff --git a/lib/internal/test_runner/tap_stream.js b/lib/internal/test_runner/tap_stream.js
index 1aba42d31a4819..ebd825a3dc9236 100644
--- a/lib/internal/test_runner/tap_stream.js
+++ b/lib/internal/test_runner/tap_stream.js
@@ -2,6 +2,7 @@
 const {
   ArrayPrototypeForEach,
   ArrayPrototypeJoin,
+  ArrayPrototypeMap,
   ArrayPrototypePush,
   ArrayPrototypeShift,
   ObjectEntries,
@@ -11,7 +12,7 @@ const {
 } = primordials;
 const { inspectWithNoCustomRetry } = require('internal/errors');
 const Readable = require('internal/streams/readable');
-const { isError } = require('internal/util');
+const { isError, kEmptyObject } = require('internal/util');
 const kFrameStartRegExp = /^ {4}at /;
 const kLineBreakRegExp = /\n|\r\n/;
 const inspectOptions = { colors: false, breakLength: Infinity };
@@ -49,12 +50,16 @@ class TapStream extends Readable {
     this.#tryPush(`Bail out!${message ? ` ${tapEscape(message)}` : ''}\n`);
   }
 
-  fail(indent, testNumber, description, directive) {
-    this.#test(indent, testNumber, 'not ok', description, directive);
+  fail(indent, testNumber, name, duration, error, directive) {
+    this.emit('test:fail', { __proto__: null, name, testNumber, duration, ...directive, error });
+    this.#test(indent, testNumber, 'not ok', name, directive);
+    this.#details(indent, duration, error);
   }
 
-  ok(indent, testNumber, description, directive) {
-    this.#test(indent, testNumber, 'ok', description, directive);
+  ok(indent, testNumber, name, duration, directive) {
+    this.emit('test:pass', { __proto__: null, name, testNumber, duration, ...directive });
+    this.#test(indent, testNumber, 'ok', name, directive);
+    this.#details(indent, duration, null);
   }
 
   plan(indent, count, explanation) {
@@ -64,18 +69,18 @@ class TapStream extends Readable {
   }
 
   getSkip(reason) {
-    return `SKIP${reason ? ` ${tapEscape(reason)}` : ''}`;
+    return { __proto__: null, skip: reason };
   }
 
   getTodo(reason) {
-    return `TODO${reason ? ` ${tapEscape(reason)}` : ''}`;
+    return { __proto__: null, todo: reason };
   }
 
   subtest(indent, name) {
     this.#tryPush(`${indent}# Subtest: ${tapEscape(name)}\n`);
   }
 
-  details(indent, duration, error) {
+  #details(indent, duration, error) {
     let details = `${indent}  ---\n`;
 
     details += jsToYaml(indent, 'duration_ms', duration);
@@ -85,6 +90,7 @@ class TapStream extends Readable {
   }
 
   diagnostic(indent, message) {
+    this.emit('test:diagnostic', message);
     this.#tryPush(`${indent}# ${tapEscape(message)}\n`);
   }
 
@@ -92,16 +98,16 @@ class TapStream extends Readable {
     this.#tryPush('TAP version 13\n');
   }
 
-  #test(indent, testNumber, status, description, directive) {
+  #test(indent, testNumber, status, name, directive = kEmptyObject) {
     let line = `${indent}${status} ${testNumber}`;
 
-    if (description) {
-      line += ` ${tapEscape(description)}`;
+    if (name) {
+      line += ` ${tapEscape(`- ${name}`)}`;
     }
 
-    if (directive) {
-      line += ` # ${directive}`;
-    }
+    line += ArrayPrototypeJoin(ArrayPrototypeMap(ObjectEntries(directive), ({ 0: key, 1: value }) => (
+      ` # ${key.toUpperCase()}${value ? ` ${tapEscape(value)}` : ''}`
+    )), '');
 
     line += '\n';
     this.#tryPush(line);
diff --git a/lib/internal/test_runner/test.js b/lib/internal/test_runner/test.js
index 83b353d5808366..27ce298d456def 100644
--- a/lib/internal/test_runner/test.js
+++ b/lib/internal/test_runner/test.js
@@ -180,7 +180,7 @@ class Test extends AsyncResource {
 
       case 'boolean':
         if (concurrency) {
-          this.concurrency = isTestRunner ? MathMax(cpus().length - 1, 1) : Infinity;
+          this.concurrency = parent === null ? MathMax(cpus().length - 1, 1) : Infinity;
         } else {
           this.concurrency = 1;
         }
@@ -516,7 +516,7 @@ class Test extends AsyncResource {
   }
 
   postRun(pendingSubtestsError) {
-    let failedSubtests = 0;
+    const counters = { __proto__: null, failed: 0, passed: 0, cancelled: 0, skipped: 0, todo: 0, totalFailed: 0 };
 
     // If the test was failed before it even started, then the end time will
     // be earlier than the start time. Correct that here.
@@ -536,14 +536,28 @@ class Test extends AsyncResource {
         subtest.postRun(pendingSubtestsError);
       }
 
+      // Check SKIP and TODO tests first, as those should not be counted as
+      // failures.
+      if (subtest.skipped) {
+        counters.skipped++;
+      } else if (subtest.isTodo) {
+        counters.todo++;
+      } else if (subtest.cancelled) {
+        counters.cancelled++;
+      } else if (!subtest.passed) {
+        counters.failed++;
+      } else {
+        counters.passed++;
+      }
+
       if (!subtest.passed) {
-        failedSubtests++;
+        counters.totalFailed++;
       }
     }
 
-    if (this.passed && failedSubtests > 0) {
-      const subtestString = `subtest${failedSubtests > 1 ? 's' : ''}`;
-      const msg = `${failedSubtests} ${subtestString} failed`;
+    if ((this.passed || this.parent === null) && counters.totalFailed > 0) {
+      const subtestString = `subtest${counters.totalFailed > 1 ? 's' : ''}`;
+      const msg = `${counters.totalFailed} ${subtestString} failed`;
 
       this.fail(new ERR_TEST_FAILURE(msg, kSubtestsFailed));
     }
@@ -555,6 +569,22 @@ class Test extends AsyncResource {
       this.parent.addReadySubtest(this);
       this.parent.processReadySubtestRange(false);
       this.parent.processPendingSubtests();
+    } else if (!this.reported) {
+      this.reported = true;
+      this.reporter.plan(this.indent, this.subtests.length);
+
+      for (let i = 0; i < this.diagnostics.length; i++) {
+        this.reporter.diagnostic(this.indent, this.diagnostics[i]);
+      }
+
+      this.reporter.diagnostic(this.indent, `tests ${this.subtests.length}`);
+      this.reporter.diagnostic(this.indent, `pass ${counters.passed}`);
+      this.reporter.diagnostic(this.indent, `fail ${counters.failed}`);
+      this.reporter.diagnostic(this.indent, `cancelled ${counters.cancelled}`);
+      this.reporter.diagnostic(this.indent, `skipped ${counters.skipped}`);
+      this.reporter.diagnostic(this.indent, `todo ${counters.todo}`);
+      this.reporter.diagnostic(this.indent, `duration_ms ${this.#duration()}`);
+      this.reporter.push(null);
     }
   }
 
@@ -588,10 +618,12 @@ class Test extends AsyncResource {
     this.finished = true;
   }
 
-  report() {
+  #duration() {
     // Duration is recorded in BigInt nanoseconds. Convert to seconds.
-    const duration = Number(this.endTime - this.startTime) / 1_000_000_000;
-    const message = `- ${this.name}`;
+    return Number(this.endTime - this.startTime) / 1_000_000_000;
+  }
+
+  report() {
     let directive;
 
     if (this.skipped) {
@@ -601,13 +633,11 @@ class Test extends AsyncResource {
     }
 
     if (this.passed) {
-      this.reporter.ok(this.indent, this.testNumber, message, directive);
+      this.reporter.ok(this.indent, this.testNumber, this.name, this.#duration(), directive);
     } else {
-      this.reporter.fail(this.indent, this.testNumber, message, directive);
+      this.reporter.fail(this.indent, this.testNumber, this.name, this.#duration(), this.error, directive);
     }
 
-    this.reporter.details(this.indent, duration, this.error);
-
     for (let i = 0; i < this.diagnostics.length; i++) {
       this.reporter.diagnostic(this.indent, this.diagnostics[i]);
     }
@@ -630,6 +660,8 @@ class TestHook extends Test {
   getRunArgs() {
     return this.#args;
   }
+  postRun() {
+  }
 }
 
 class ItTest extends Test {
diff --git a/lib/test.js b/lib/test.js
index a365eef6d45f91..c8a4bae9148ab4 100644
--- a/lib/test.js
+++ b/lib/test.js
@@ -1,14 +1,19 @@
 'use strict';
+const { ObjectAssign } = primordials;
 const { test, describe, it, before, after, beforeEach, afterEach } = require('internal/test_runner/harness');
+const { run } = require('internal/test_runner/runner');
 const { emitExperimentalWarning } = require('internal/util');
 
 emitExperimentalWarning('The test runner');
 
 module.exports = test;
-module.exports.test = test;
-module.exports.describe = describe;
-module.exports.it = it;
-module.exports.before = before;
-module.exports.after = after;
-module.exports.beforeEach = beforeEach;
-module.exports.afterEach = afterEach;
+ObjectAssign(module.exports, {
+  after,
+  afterEach,
+  before,
+  beforeEach,
+  describe,
+  it,
+  run,
+  test,
+});
diff --git a/test/message/test_runner_no_tests.out b/test/message/test_runner_no_tests.out
index 9f84e58dc125f8..9daeafb9864cf4 100644
--- a/test/message/test_runner_no_tests.out
+++ b/test/message/test_runner_no_tests.out
@@ -1 +1 @@
-bound test
+test
diff --git a/test/parallel/test-runner-run.mjs b/test/parallel/test-runner-run.mjs
new file mode 100644
index 00000000000000..4a0d4f025bf7bf
--- /dev/null
+++ b/test/parallel/test-runner-run.mjs
@@ -0,0 +1,69 @@
+import * as common from '../common/index.mjs';
+import * as fixtures from '../common/fixtures.mjs';
+import { join } from 'node:path';
+import { describe, it, run } from 'node:test';
+import assert from 'node:assert';
+
+const testFixtures = fixtures.path('test-runner');
+
+describe('require(\'node:test\').run', { concurrency: true }, () => {
+
+  it('should run with no tests', async () => {
+    const stream = run({ files: [] });
+    stream.setEncoding('utf8');
+    stream.on('test:fail', common.mustNotCall());
+    stream.on('test:pass', common.mustNotCall());
+    // eslint-disable-next-line no-unused-vars
+    for await (const _ of stream); // TODO(MoLow): assert.snapshot
+  });
+
+  it('should fail with non existing file', async () => {
+    const stream = run({ files: ['a-random-file-that-does-not-exist.js'] });
+    stream.on('test:fail', common.mustCall(1));
+    stream.on('test:pass', common.mustNotCall());
+    // eslint-disable-next-line no-unused-vars
+    for await (const _ of stream); // TODO(MoLow): assert.snapshot
+  });
+
+  it('should succeed with a file', async () => {
+    const stream = run({ files: [join(testFixtures, 'test/random.cjs')] });
+    stream.on('test:fail', common.mustNotCall());
+    stream.on('test:pass', common.mustCall(1));
+    // eslint-disable-next-line no-unused-vars
+    for await (const _ of stream); // TODO(MoLow): assert.snapshot
+  });
+
+  it('should run same file twice', async () => {
+    const stream = run({ files: [join(testFixtures, 'test/random.cjs'), join(testFixtures, 'test/random.cjs')] });
+    stream.on('test:fail', common.mustNotCall());
+    stream.on('test:pass', common.mustCall(2));
+    // eslint-disable-next-line no-unused-vars
+    for await (const _ of stream); // TODO(MoLow): assert.snapshot
+  });
+
+  it('should run a failed test', async () => {
+    const stream = run({ files: [testFixtures] });
+    stream.on('test:fail', common.mustCall(1));
+    stream.on('test:pass', common.mustNotCall());
+    // eslint-disable-next-line no-unused-vars
+    for await (const _ of stream); // TODO(MoLow): assert.snapshot
+  });
+
+  it('should support timeout', async () => {
+    const stream = run({ timeout: 50, files: [
+      fixtures.path('test-runner', 'never_ending_sync.js'),
+      fixtures.path('test-runner', 'never_ending_async.js'),
+    ] });
+    stream.on('test:fail', common.mustCall(2));
+    stream.on('test:pass', common.mustNotCall());
+    // eslint-disable-next-line no-unused-vars
+    for await (const _ of stream); // TODO(MoLow): assert.snapshot
+  });
+
+  it('should validate files', async () => {
+    [Symbol(), {}, () => {}, 0, 1, 0n, 1n, '', '1', Promise.resolve([]), true, false]
+      .forEach((files) => assert.throws(() => run({ files }), {
+        code: 'ERR_INVALID_ARG_TYPE'
+      }));
+  });
+});
diff --git a/tools/doc/type-parser.mjs b/tools/doc/type-parser.mjs
index c77cba7de19fc0..da24512b52d137 100644
--- a/tools/doc/type-parser.mjs
+++ b/tools/doc/type-parser.mjs
@@ -201,6 +201,8 @@ const customTypesMap = {
   'Timeout': 'timers.html#class-timeout',
   'Timer': 'timers.html#timers',
 
+  'TapStream': 'test.html#class-tapstream',
+
   'tls.SecureContext': 'tls.html#tlscreatesecurecontextoptions',
   'tls.Server': 'tls.html#class-tlsserver',
   'tls.TLSSocket': 'tls.html#class-tlstlssocket',