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test/parallel/test-fs-write-stream-eagain.mjs

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+import * as common from '../common/index.mjs';
+import tmpdir from '../common/tmpdir.js';
+import assert from 'node:assert';
+import fs from 'node:fs';
+import { describe, it, mock } from 'node:test';
+import { finished } from 'node:stream/promises';
+
+tmpdir.refresh();
+const file = tmpdir.resolve('writeStreamEAGAIN.txt');
+const errorWithEAGAIN = (fd, buffer, offset, length, position, callback) => {
+  callback(Object.assign(new Error(), { code: 'EAGAIN' }), 0, buffer);
+};
+
+describe('WriteStream EAGAIN', { concurrency: !process.env.TEST_PARALLEL }, () => {
+  it('_write', async () => {
+    const mockWrite = mock.fn(fs.write);
+    mockWrite.mock.mockImplementationOnce(errorWithEAGAIN);
+    const stream = fs.createWriteStream(file, {
+      fs: {
+        open: common.mustCall(fs.open),
+        write: mockWrite,
+        close: common.mustCall(fs.close),
+      }
+    });
+    stream.end('foo');
+    stream.on('close', common.mustCall());
+    stream.on('error', common.mustNotCall());
+    await finished(stream);
+    assert.strictEqual(mockWrite.mock.callCount(), 2);
+    assert.strictEqual(fs.readFileSync(file, 'utf8'), 'foo');
+  });
+
+  it('_write', async () => {
+    const stream = fs.createWriteStream(file);
+    mock.getter(stream, 'destroyed', () => true);
+    stream.end('foo');
+    await finished(stream).catch(common.mustCall());
+  });
+});