1 files changed, 38 insertions, 0 deletions
diff --git a/std/node/_fs/_fs_appendFile_test.ts b/std/node/_fs/_fs_appendFile_test.ts
index d41065205..f16b61599 100644
--- a/std/node/_fs/_fs_appendFile_test.ts
+++ b/std/node/_fs/_fs_appendFile_test.ts
@@ -206,3 +206,41 @@ Deno.test({
     Deno.removeSync(tempFile);
   },
 });
+
+Deno.test({
+  name: "Sync: Data is written in Uint8Array to passed in file path",
+  fn() {
+    const openResourcesBeforeAppend: Deno.ResourceMap = Deno.resources();
+    const test_data = new TextEncoder().encode("hello world");
+    appendFileSync("_fs_appendFile_test_file_sync.txt", test_data);
+    assertEquals(Deno.resources(), openResourcesBeforeAppend);
+    const data = Deno.readFileSync("_fs_appendFile_test_file_sync.txt");
+    assertEquals(data, test_data);
+    Deno.removeSync("_fs_appendFile_test_file_sync.txt");
+  },
+});
+
+Deno.test({
+  name: "Async: Data is written in Uint8Array to passed in file path",
+  async fn() {
+    const openResourcesBeforeAppend: Deno.ResourceMap = Deno.resources();
+    const test_data = new TextEncoder().encode("hello world");
+    await new Promise((resolve, reject) => {
+      appendFile("_fs_appendFile_test_file.txt", test_data, (err) => {
+        if (err) reject(err);
+        else resolve();
+      });
+    })
+      .then(async () => {
+        assertEquals(Deno.resources(), openResourcesBeforeAppend);
+        const data = await Deno.readFile("_fs_appendFile_test_file.txt");
+        assertEquals(data, test_data);
+      })
+      .catch((err) => {
+        fail("No error was expected: " + err);
+      })
+      .finally(async () => {
+        await Deno.remove("_fs_appendFile_test_file.txt");
+      });
+  },
+});