test: FileHandle.appendFile

yarnpkg · Apr 23, 2022 · a8feb13 · a8feb13
1 parent c1ef64d
commit a8feb13
Showing 1 changed file with 20 additions and 0 deletions.
diff --git a/packages/yarnpkg-fslib/tests/patchedFs.test.ts b/packages/yarnpkg-fslib/tests/patchedFs.test.ts
@@ -340,4 +340,24 @@ describe(`patchedFs`, () => {
       await expect(patchedFs.promises.readFile(filepath, `utf8`)).resolves.toEqual(`foobar`);
     });
   });
+
+  it(`should support FileHandle.appendFile`, async () => {
+    const patchedFs = extendFs(fs, new PosixFS(new NodeFS()));
+
+    await xfs.mktempPromise(async dir => {
+      const filepath = npath.join(npath.fromPortablePath(dir), `foo.txt`);
+      await patchedFs.promises.writeFile(filepath, `foo`);
+
+      const fd = await patchedFs.promises.open(filepath, `r+`);
+
+      // Move to the end of the file
+      await fd.readFile();
+
+      await expect(fd.appendFile(`bar`)).resolves.toBeUndefined();
+
+      await fd.close();
+
+      await expect(patchedFs.promises.readFile(filepath, `utf8`)).resolves.toEqual(`foobar`);
+    });
+  });
 });