1 files changed, 35 insertions, 0 deletions
diff --git a/tests/unit_node/fs_test.ts b/tests/unit_node/fs_test.ts
index caa266ef2..e62a246fa 100644
--- a/tests/unit_node/fs_test.ts
+++ b/tests/unit_node/fs_test.ts
@@ -5,6 +5,7 @@ import { join } from "node:path";
 import { tmpdir } from "node:os";
 import {
   constants,
+  createWriteStream,
   existsSync,
   mkdtempSync,
   promises,
@@ -14,6 +15,7 @@ import {
   writeFileSync,
 } from "node:fs";
 import { constants as fsPromiseConstants, cp } from "node:fs/promises";
+import process from "node:process";
 import { pathToAbsoluteFileUrl } from "../unit/test_util.ts";
 
 Deno.test(
@@ -121,3 +123,36 @@ Deno.test(
     assert(dataRead === "Hello");
   },
 );
+
+// TODO(kt3k): Delete this test case, and instead enable the compat case
+// `test/parallel/test-fs-writestream-open-write.js`, when we update
+// `tests/node_compat/runner/suite`.
+Deno.test("[node/fs createWriteStream", async () => {
+  const { promise, resolve, reject } = Promise.withResolvers<void>();
+  const tempDir = await Deno.makeTempDir();
+  const file = join(tempDir, "file.txt");
+  try {
+    const w = createWriteStream(file);
+
+    w.on("open", () => {
+      w.write("hello, ");
+
+      process.nextTick(() => {
+        w.write("world");
+        w.end();
+      });
+    });
+
+    w.on("close", async () => {
+      try {
+        assertEquals(await Deno.readTextFile(file), "hello, world");
+        resolve();
+      } catch (e) {
+        reject(e);
+      }
+    });
+    await promise;
+  } finally {
+    await Deno.remove(tempDir, { recursive: true });
+  }
+});