add tests

test/fixtures/test-runner/index.test.tap

@@ -0,0 +1,13 @@
+TAP version 13
+# Subtest: this should pass
+ok 1 - this should pass
+  ---
+  duration_ms: 
+  ...
+1..1
+# tests 1
+# pass 1
+# fail 0
+# skipped 0
+# todo 0
+# duration_ms: 

test/fixtures/test-runner/nested.test.cli.tap

@@ -0,0 +1,13 @@
+TAP version 13
+# Subtest: $FILE_PATH
+ok 1 - $FILE_PATH
+  ---
+  duration_ms: 
+  ...
+1..1
+# tests 1
+# pass 1
+# fail 0
+# skipped 0
+# todo 0
+# duration_ms: 

test/fixtures/test-runner/nested.test.js

@@ -0,0 +1,12 @@
+'use strict';
+const test = require('node:test');
+
+test('level 1', async (t) => {
+    await t.test('level 2.1', async (t) => {
+        await t.test('level 3', () => {});
+    });
+    await t.test('level 2.2', async (t) => {
+        await t.test('level 3', () => {});
+    });
+    await t.test('level 2.4', () => {});
+});

test/fixtures/test-runner/nested.test.tap

@@ -0,0 +1,41 @@
+TAP version 13
+# Subtest: level 1
+    # Subtest: level 2.1
+        # Subtest: level 3
+        ok 1 - level 3
+          ---
+          duration_ms: 
+          ...
+        1..1
+    ok 1 - level 2.1
+      ---
+      duration_ms: 
+      ...
+    # Subtest: level 2.2
+        # Subtest: level 3
+        ok 1 - level 3
+          ---
+          duration_ms: 
+          ...
+        1..1
+    ok 2 - level 2.2
+      ---
+      duration_ms: 
+      ...
+    # Subtest: level 2.4
+    ok 3 - level 2.4
+      ---
+      duration_ms: 
+      ...
+    1..3
+ok 1 - level 1
+  ---
+  duration_ms: 
+  ...
+1..1
+# tests 1
+# pass 1
+# fail 0
+# skipped 0
+# todo 0
+# duration_ms: 

test/fixtures/test-runner/search-files/test/random.cjs

@@ -0,0 +1,4 @@
+'use strict';
+const test = require('node:test');
+
+test('this should pass');

test/parallel/test-runner-cli.js

@@ -4,7 +4,7 @@ const assert = require('assert');
 const { spawnSync } = require('child_process');
 const { join } = require('path');
 const fixtures = require('../common/fixtures');
-const testFixtures = fixtures.path('test-runner');
+const testFixtures = fixtures.path('test-runner/search-files');
 
 {
   // File not found.

test/parallel/test-runner-tap-protocol.js

@@ -0,0 +1,35 @@
+'use strict';
+require('../common');
+const assert = require('assert');
+const { spawnSync } = require('child_process');
+const fixtures = require('../common/fixtures');
+
+function removeDuration(str) {
+  return str.replace(/duration_ms:? .+/g, 'duration_ms: ');
+}
+
+{
+  // sanity
+  const child = spawnSync(process.execPath, [fixtures.path('test-runner/index.test.js')]);
+  const stdout = removeDuration(child.stdout.toString());
+  const expected = fixtures.readSync('test-runner/index.test.tap').toString();
+
+  assert.strictEqual(stdout, expected);
+}
+{
+  // nested tests
+  const child = spawnSync(process.execPath, [fixtures.path('test-runner/nested.test.js')]);
+  const stdout = removeDuration(child.stdout.toString());
+  const expected = fixtures.readSync('test-runner/nested.test.tap').toString();
+
+  assert.strictEqual(stdout, expected);
+}
+{
+  // using test runner cli
+  const file = fixtures.path('test-runner/nested.test.js');
+  const child = spawnSync(process.execPath, ['--test', fixtures.path('test-runner/nested.test.js')]);
+  const stdout = removeDuration(child.stdout.toString());
+  const expected = fixtures.readSync('test-runner/nested.test.cli.tap').toString().replace(/\$FILE_PATH/g, file);
+
+  assert.strictEqual(stdout, expected);
+}