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deps/v8/test/inspector/debugger/restart-frame/fails-for-resumables.js

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+// Copyright 2022 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+const {session, contextGroup, Protocol} =
+  InspectorTest.start('Checks that restart frame fails for generator or async functions.');
+
+session.setupScriptMap();
+
+async function testCase(description, snippet, restartFrameIndex) {
+  InspectorTest.log('');
+  InspectorTest.log(description);
+
+  const { callFrames, evaluatePromise } = await InspectorTest.evaluateAndWaitForPause(snippet);
+  // These are negative tests where the following call is expected to fail.
+  await InspectorTest.restartFrameAndWaitForPause(callFrames, restartFrameIndex, /*quitOnFailure*/ false);
+
+  // All snippets are written so a single resume is enough.
+  Protocol.Debugger.resume();
+  await evaluatePromise;
+}
+
+(async () => {
+  await Protocol.Debugger.enable();
+
+  await testCase('Check that an async function cannot be restarted.', `
+    (async function asyncFn() {
+      debugger;
+    })();
+  `, 0);
+
+  await testCase('Check that a generator function cannot be restarted.', `
+    function* generatorFn() {
+      yield 10;
+      debugger;
+      yield 20;
+    }
+    const gen1 = generatorFn();
+    gen1.next();
+    gen1.next();
+  `, 0);
+
+  await testCase('Check that a function cannot be restarted when a generator function is on the stack above', `
+    function breaker() { debugger; }
+    function* genFn() {
+      yield 10;
+      breaker();
+      yield 20;
+    }
+    const gen2 = genFn();
+    function bar() {  // We want to restart bar.
+      gen2.next();
+      gen2.next();
+    }
+    bar();
+  `, 2);
+
+  InspectorTest.completeTest();
+})();