nodejs
diff --git a/Collapse file
‎lib/internal/test_runner/test.js‎
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+6Lines changed: 6 additions & 0 deletions b/Collapse file
‎lib/internal/test_runner/test.js‎
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+6Lines changed: 6 additions & 0 deletions
diff --git a/Collapse file
‎test/message/test_runner_output.out‎
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+3Lines changed: 3 additions & 0 deletions b/Collapse file
‎test/message/test_runner_output.out‎
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+3Lines changed: 3 additions & 0 deletions
diff --git a/Collapse file
‎test/message/test_runner_output_cli.out‎
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‎test/message/test_runner_output_cli.out‎
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‎test/message/test_runner_output_spec_reporter.out‎
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‎test/message/test_runner_output_spec_reporter.out‎
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+3Lines changed: 3 additions & 0 deletions
@@ -278,6 +278,12 @@ class Test extends AsyncResource {
     };
     this.waitingOn = 0;
     this.finished = false;
+
+    if (!testOnlyFlag && (only || this.runOnlySubtests)) {
+      const warning =
+        "'only' and 'runOnly' require the --test-only command-line option.";
+      this.diagnostic(warning);
+    }
   }
 
   hasConcurrency() {
 
@@ -475,11 +475,13 @@ ok 52 - callback async throw after done
       ---
       duration_ms: *
       ...
+    # 'only' and 'runOnly' require the --test-only command-line option.
     # Subtest: running subtest 3
     ok 3 - running subtest 3
       ---
       duration_ms: *
       ...
+    # 'only' and 'runOnly' require the --test-only command-line option.
     # Subtest: running subtest 4
     ok 4 - running subtest 4
       ---
@@ -490,6 +492,7 @@ ok 53 - only is set but not in only mode
   ---
   duration_ms: *
   ...
+# 'only' and 'runOnly' require the --test-only command-line option.
 # Subtest: custom inspect symbol fail
 not ok 54 - custom inspect symbol fail
   ---
 
@@ -475,11 +475,13 @@ ok 52 - callback async throw after done
       ---
       duration_ms: *
       ...
+    # 'only' and 'runOnly' require the --test-only command-line option.
     # Subtest: running subtest 3
     ok 3 - running subtest 3
       ---
       duration_ms: *
       ...
+    # 'only' and 'runOnly' require the --test-only command-line option.
     # Subtest: running subtest 4
     ok 4 - running subtest 4
       ---
@@ -490,6 +492,7 @@ ok 53 - only is set but not in only mode
   ---
   duration_ms: *
   ...
+# 'only' and 'runOnly' require the --test-only command-line option.
 # Subtest: custom inspect symbol fail
 not ok 54 - custom inspect symbol fail
   ---
 
@@ -199,9 +199,12 @@
  only is set but not in only mode
    running subtest 1 (*ms)
    running subtest 2 (*ms)
+   'only' and 'runOnly' require the --test-only command-line option.
    running subtest 3 (*ms)
+   'only' and 'runOnly' require the --test-only command-line option.
    running subtest 4 (*ms)
  only is set but not in only mode (*ms)
+ 'only' and 'runOnly' require the --test-only command-line option.
 
  custom inspect symbol fail (*ms)
   customized