file tests

src/__tests__/file.test.js

@@ -0,0 +1,49 @@
+import file from '../io/file';
+
+jest.mock('../ops/index.js', () => (
+  {
+    ...(jest.requireActual('../ops/index.js')),
+    close_file: jest.fn(),
+  }
+));
+
+import {close_file} from '../ops/index';
+
+test(`can close a closed file`, async () => {
+  const f = new file();
+  expect(await f.close()).toEqual(0);
+});
+
+test(`'get_size' fails on closed file`, async () => {
+  const f = new file();
+  await expect(f.get_size()).rejects.toThrow(Error);
+});
+
+test(`'read' fails on closed file`, async () => {
+  const f = new file();
+  await expect(f.read(0, 10)).rejects.toThrow(Error);
+});
+
+test(`'truncate' fails on closed file`, async () => {
+  const f = new file();
+  await expect(f.truncate(0)).rejects.toThrow(Error);
+});
+
+test(`'write' fails on closed file`, async () => {
+  const f = new file();
+  await expect(f.write(0, Buffer.alloc(2))).rejects.toThrow(Error);
+});
+
+test(`handle is set to null on close`, async () => {
+  const f = new file(null, 1, '/path');
+  close_file.mockReturnValue(0);
+  expect(await f.close()).toEqual(0);
+  expect(f.handle).toBeNull();
+});
+
+test(`handle is not changed on close if return is not 0`, async () => {
+  const f = new file(null, 1, '/path');
+  close_file.mockReturnValue(1);
+  expect(await f.close()).toEqual(1);
+  expect(f.handle).toBe(1);
+});