test_runner: report tap subtest in order

PR-URL: nodejs/node#45220
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
(cherry picked from commit 3e57891ee2fde0971e18fc383c25acf8f90def05)

lib/internal/test_runner/test.js

@@ -1,4 +1,4 @@
-// https://github.com/nodejs/node/blob/a69a30016cf3395b0bd775c1340ab6ecbac58296/lib/internal/test_runner/test.js
+// https://github.com/nodejs/node/blob/3e57891ee2fde0971e18fc383c25acf8f90def05/lib/internal/test_runner/test.js
 
 'use strict'
 
@@ -146,6 +146,7 @@ class TestContext {
 class Test extends AsyncResource {
   #abortController
   #outerSignal
+  #reportedSubtest
 
   constructor (options) {
     super('Test')
@@ -312,7 +313,7 @@ class Test extends AsyncResource {
       }
 
       if (i === 1 && this.parent !== null) {
-        this.reporter.subtest(this.indent, this.name)
+        this.reportSubtest()
       }
 
       // Report the subtest's results and remove it from the ready map.
@@ -635,12 +636,6 @@ class Test extends AsyncResource {
     this.processReadySubtestRange(true)
 
     // Output this test's results and update the parent's waiting counter.
-    if (this.subtests.length > 0) {
-      this.reporter.plan(this.subtests[0].indent, this.subtests.length)
-    } else {
-      this.reporter.subtest(this.indent, this.name)
-    }
-
     this.report()
     this.parent.waitingOn++
     this.finished = true
@@ -652,6 +647,11 @@ class Test extends AsyncResource {
   }
 
   report () {
+    if (this.subtests.length > 0) {
+      this.reporter.plan(this.subtests[0].indent, this.subtests.length)
+    } else {
+      this.reportSubtest()
+    }
     let directive
 
     if (this.skipped) {
@@ -670,6 +670,15 @@ class Test extends AsyncResource {
       this.reporter.diagnostic(this.indent, this.diagnostics[i])
     }
   }
+
+  reportSubtest () {
+    if (this.#reportedSubtest || this.parent === null) {
+      return
+    }
+    this.#reportedSubtest = true
+    this.parent.reportSubtest()
+    this.reporter.subtest(this.indent, this.name)
+  }
 }
 
 class TestHook extends Test {

test/message/test_runner_describe_nested.js

@@ -0,0 +1,11 @@
+// https://github.com/nodejs/node/blob/3e57891ee2fde0971e18fc383c25acf8f90def05/test/message/test_runner_describe_nested.js
+// Flags: --no-warnings
+'use strict'
+require('../common')
+const { describe, it } = require('#node:test')
+
+describe('nested - no tests', () => {
+  describe('nested', () => {
+    it('nested', () => {})
+  })
+})

test/message/test_runner_describe_nested.out

@@ -0,0 +1,26 @@
+TAP version 13
+# Subtest: nested - no tests
+    # Subtest: nested
+        # Subtest: nested
+        ok 1 - nested
+          ---
+          duration_ms: *
+          ...
+        1..1
+    ok 1 - nested
+      ---
+      duration_ms: *
+      ...
+    1..1
+ok 1 - nested - no tests
+  ---
+  duration_ms: *
+  ...
+1..1
+# tests 1
+# pass 1
+# fail 0
+# cancelled 0
+# skipped 0
+# todo 0
+# duration_ms *