feat(std/node): add link/linkSync polyfill (#5930)

1 files changed, 67 insertions, 0 deletions

diff --git a/std/node/_fs/_fs_link_test.ts b/std/node/_fs/_fs_link_test.ts
new file mode 100644
index 000000000..e59984c8c
--- /dev/null
+++ b/std/node/_fs/_fs_link_test.ts
@@ -0,0 +1,67 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+const { test } = Deno;
+import { fail, assertEquals } from "../../testing/asserts.ts";
+import { link, linkSync } from "./_fs_link.ts";
+import { assert } from "https://deno.land/std@v0.50.0/testing/asserts.ts";
+const isWindows = Deno.build.os === "windows";
+
+test({
+  ignore: isWindows,
+  name: "ASYNC: hard linking files works as expected",
+  async fn() {
+    const tempFile: string = await Deno.makeTempFile();
+    const linkedFile: string = tempFile + ".link";
+    await new Promise((res, rej) => {
+      link(tempFile, linkedFile, (err) => {
+        if (err) rej(err);
+        else res();
+      });
+    })
+      .then(() => {
+        assertEquals(Deno.statSync(tempFile), Deno.statSync(linkedFile));
+      })
+      .catch(() => {
+        fail("Expected to succeed");
+      })
+      .finally(() => {
+        Deno.removeSync(tempFile);
+        Deno.removeSync(linkedFile);
+      });
+  },
+});
+
+test({
+  ignore: isWindows,
+  name: "ASYNC: hard linking files passes error to callback",
+  async fn() {
+    let failed = false;
+    await new Promise((res, rej) => {
+      link("no-such-file", "no-such-file", (err) => {
+        if (err) rej(err);
+        else res();
+      });
+    })
+      .then(() => {
+        fail("Expected to succeed");
+      })
+      .catch((err) => {
+        assert(err);
+        failed = true;
+      });
+    assert(failed);
+  },
+});
+
+test({
+  ignore: isWindows,
+  name: "SYNC: hard linking files works as expected",
+  fn() {
+    const tempFile: string = Deno.makeTempFileSync();
+    const linkedFile: string = tempFile + ".link";
+    linkSync(tempFile, linkedFile);
+
+    assertEquals(Deno.statSync(tempFile), Deno.statSync(linkedFile));
+    Deno.removeSync(tempFile);
+    Deno.removeSync(linkedFile);
+  },
+});