test_runner: allways enqueue suite subtests

Author: MoLow

lib/internal/test_runner/test.js

@@ -919,6 +919,13 @@ class Suite extends Test {
     return { __proto__: null, ctx, args: [ctx] };
   }
 
+  hasConcurrency() {
+    if (this.runOnlySubtests && !this.buildPhaseFinished) {
+      return false;
+    }
+    return super.hasConcurrency();
+  }
+
   async run() {
     const hookArgs = this.getRunArgs();
 
@@ -939,6 +946,7 @@ class Suite extends Test {
 
       await this.runHook('before', hookArgs);
 
+      this.processPendingSubtests();
       stopPromise = stopTest(this.timeout, this.signal);
       const subtests = this.skipped || this.error ? [] : this.subtests;
       const promise = SafePromiseAll(subtests, (subtests) => subtests.start());