fix(spawn) add Uint8Array support for stdout (#2866)

* add array_buffer support for stdout

* fix comment

* fix param name on baby_list

* keep test names consistent

* add more test cases

1 files changed, 64 insertions, 0 deletions

diff --git a/test/js/bun/spawn/spawn.test.ts b/test/js/bun/spawn/spawn.test.ts
index c43c06d02..753bcda6a 100644
--- a/test/js/bun/spawn/spawn.test.ts
+++ b/test/js/bun/spawn/spawn.test.ts
@@ -162,6 +162,70 @@ for (let [gcTick, label] of [
         }
       });
 
+      it("Uint8Array works as stdout", () => {
+        gcTick();
+        const stdout_buffer = new Uint8Array(11);
+        const { stdout } = spawnSync(["echo", "hello world"], {
+          stdout: stdout_buffer,
+          stderr: null,
+          stdin: null,
+        });
+        gcTick();
+        const text = new TextDecoder().decode(stdout);
+        const text2 = new TextDecoder().decode(stdout_buffer);
+        expect(text).toBe("hello world");
+        expect(text2).toBe("hello world");
+        gcTick();
+      });
+
+      it("Uint8Array works as stdout when is smaller than output", () => {
+        gcTick();
+        const stdout_buffer = new Uint8Array(5);
+        const { stdout } = spawnSync(["echo", "hello world"], {
+          stdout: stdout_buffer,
+          stderr: null,
+          stdin: null,
+        });
+        gcTick();
+        const text = new TextDecoder().decode(stdout);
+        const text2 = new TextDecoder().decode(stdout_buffer);
+        expect(text).toBe("hello");
+        expect(text2).toBe("hello");
+        gcTick();
+      });
+
+      it("Uint8Array works as stdout when is the exactly size than output", () => {
+        gcTick();
+        const stdout_buffer = new Uint8Array(12);
+        const { stdout } = spawnSync(["echo", "hello world"], {
+          stdout: stdout_buffer,
+          stderr: null,
+          stdin: null,
+        });
+        gcTick();
+        const text = new TextDecoder().decode(stdout);
+        const text2 = new TextDecoder().decode(stdout_buffer);
+        expect(text).toBe("hello world\n");
+        expect(text2).toBe("hello world\n");
+        gcTick();
+      });
+
+      it("Uint8Array works as stdout when is larger than output", () => {
+        gcTick();
+        const stdout_buffer = new Uint8Array(15);
+        const { stdout } = spawnSync(["echo", "hello world"], {
+          stdout: stdout_buffer,
+          stderr: null,
+          stdin: null,
+        });
+        gcTick();
+        const text = new TextDecoder().decode(stdout);
+        const text2 = new TextDecoder().decode(stdout_buffer);
+        expect(text).toBe("hello world\n");
+        expect(text2).toBe("hello world\n\u0000\u0000\u0000");
+        gcTick();
+      });
+
       it("Blob works as stdin", async () => {
         rmSync("/tmp/out.123.txt", { force: true });
         gcTick();