1 files changed, 69 insertions, 0 deletions
diff --git a/test/bun.js/mmap.test.js b/test/bun.js/mmap.test.js
new file mode 100644
index 000000000..2b15a4000
--- /dev/null
+++ b/test/bun.js/mmap.test.js
@@ -0,0 +1,69 @@
+import { describe, it, expect } from "bun:test";
+import { gcTick } from "./gc";
+
+describe("Bun.mmap", async () => {
+  await gcTick();
+  const path = `/tmp/bun-mmap-test_${Math.random()}.txt`;
+  await gcTick();
+  await Bun.write(path, "hello");
+  await gcTick();
+
+  it("mmap finalizer", async () => {
+    let map = Bun.mmap(path);
+    await gcTick();
+    const map2 = Bun.mmap(path);
+
+    map = null;
+    await gcTick();
+  });
+
+  it("mmap passed to other syscalls", async () => {
+    const map = Bun.mmap(path);
+    await gcTick();
+    await Bun.write(path + "1", map);
+    await gcTick();
+    const text = await (await Bun.file(path + "1")).text();
+    await gcTick();
+
+    expect(text).toBe(new TextDecoder().decode(map));
+  });
+
+  it("mmap sync", async () => {
+    const map = Bun.mmap(path);
+    await gcTick();
+    const map2 = Bun.mmap(path);
+    await gcTick();
+
+    const old = map[0];
+    await gcTick();
+    map[0] = 0;
+    await gcTick();
+    expect(map2[0]).toBe(0);
+
+    map2[0] = old;
+    await gcTick();
+    expect(map[0]).toBe(old);
+    await gcTick();
+    await Bun.write(path, "olleh");
+    await gcTick();
+    expect(new TextDecoder().decode(map)).toBe("olleh");
+    await gcTick();
+  });
+
+  it("mmap private", async () => {
+    await gcTick();
+    const map = Bun.mmap(path, { shared: true });
+    await gcTick();
+    const map2 = Bun.mmap(path, { shared: false });
+    await gcTick();
+    const old = map[0];
+
+    await gcTick();
+    map2[0] = 0;
+    await gcTick();
+    expect(map2[0]).toBe(0);
+    await gcTick();
+    expect(map[0]).toBe(old);
+    await gcTick();
+  });
+});