1 files changed, 35 insertions, 0 deletions

diff --git a/packages/create-turbo/__tests__/isWritable.test.ts b/packages/create-turbo/__tests__/isWritable.test.ts
new file mode 100644
index 0000000..b06670b
--- /dev/null
+++ b/packages/create-turbo/__tests__/isWritable.test.ts
@@ -0,0 +1,35 @@
+import path from "path";
+import { isWriteable } from "../src/utils/isWriteable";
+import { setupTestFixtures } from "@turbo/test-utils";
+import fs from "fs-extra";
+
+describe("isWriteable", () => {
+  const { useFixture } = setupTestFixtures({
+    directory: path.join(__dirname, "../"),
+  });
+
+  it("correctly identifies a writeable directory", async () => {
+    const { root } = useFixture({ fixture: `is-writeable` });
+    const result = await isWriteable(root);
+    expect(result).toEqual(true);
+  });
+
+  it("correctly identifies a non-writeable directory", async () => {
+    const { root } = useFixture({ fixture: `is-writeable` });
+    const result = await isWriteable(path.join(root, "does-not-exist"));
+    expect(result).toEqual(false);
+  });
+
+  it("returns false on unexpected failure", async () => {
+    const { root } = useFixture({ fixture: `is-writeable` });
+    const mockFsAccess = jest
+      .spyOn(fs, "access")
+      .mockRejectedValue(new Error("unknown error"));
+
+    const result = await isWriteable(root);
+    expect(result).toEqual(false);
+    expect(mockFsAccess).toHaveBeenCalledWith(root, fs.constants.W_OK);
+
+    mockFsAccess.mockRestore();
+  });
+});