inspector: fix inspector.close() documented behavior

doc/api/inspector.md

@@ -415,8 +415,8 @@ changes:
     description: The API is exposed in the worker threads.
 -->
 
-Attempts to close all remaining connections, blocking the event loop until all
-are closed. Once all connections are closed, deactivates the inspector.
+Deactivates the inspector. If there are active connections, they are forcibly
+terminated. Blocks until the inspector server has fully stopped.
 
 ### `inspector.console`
 

test/parallel/test-inspector-close-terminate-connections.js

@@ -0,0 +1,35 @@
+'use strict';
+const common = require('../common');
+common.skipIfInspectorDisabled();
+
+const assert = require('assert');
+const { NodeInstance } = require('../common/inspector-helper.js');
+
+// Verify that inspector.close() forcibly terminates active WebSocket
+// connections without waiting for the client to disconnect.
+
+async function test() {
+  const script = `
+    const inspector = require('inspector');
+    inspector.close();
+    process.exit(42);
+  `;
+
+  const instance = new NodeInstance(['--inspect-brk=0'], script);
+  const session = await instance.connectInspectorSession();
+
+  // Enable Runtime domain and wait for an event to confirm the session is live.
+  await session.send({ method: 'Runtime.enable' });
+  await session.waitForNotification('Runtime.executionContextCreated');
+
+  // Resume execution so the script calls inspector.close().
+  await session.send({ method: 'Runtime.runIfWaitingForDebugger' });
+
+  // The server should forcibly disconnect us.
+  await session.waitForServerDisconnect();
+
+  const { exitCode } = await instance.expectShutdown();
+  assert.strictEqual(exitCode, 42);
+}
+
+test().then(common.mustCall());