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test/parallel/test-stream-duplex-writable-finished.js

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+'use strict';
+
+const common = require('../common');
+const { Duplex } = require('stream');
+const assert = require('assert');
+
+// basic
+{
+  // Find it on Duplex.prototype
+  assert(Object.hasOwn(Duplex.prototype, 'writableFinished'));
+}
+
+// event
+{
+  const duplex = new Duplex();
+
+  duplex._write = (chunk, encoding, cb) => {
+    // The state finished should start in false.
+    assert.strictEqual(duplex.writableFinished, false);
+    cb();
+  };
+
+  duplex.on('finish', common.mustCall(() => {
+    assert.strictEqual(duplex.writableFinished, true);
+  }));
+
+  duplex.end('testing finished state', common.mustCall(() => {
+    assert.strictEqual(duplex.writableFinished, true);
+  }));
+}