1 files changed, 147 insertions, 0 deletions
diff --git a/cli/js/tests/link_test.ts b/cli/js/tests/link_test.ts
new file mode 100644
index 000000000..e9f72ebef
--- /dev/null
+++ b/cli/js/tests/link_test.ts
@@ -0,0 +1,147 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { unitTest, assert, assertEquals } from "./test_util.ts";
+
+unitTest(
+  { perms: { read: true, write: true } },
+  function linkSyncSuccess(): void {
+    const testDir = Deno.makeTempDirSync();
+    const oldData = "Hardlink";
+    const oldName = testDir + "/oldname";
+    const newName = testDir + "/newname";
+    Deno.writeFileSync(oldName, new TextEncoder().encode(oldData));
+    // Create the hard link.
+    Deno.linkSync(oldName, newName);
+    // We should expect reading the same content.
+    const newData = new TextDecoder().decode(Deno.readFileSync(newName));
+    assertEquals(oldData, newData);
+    // Writing to newname also affects oldname.
+    const newData2 = "Modified";
+    Deno.writeFileSync(newName, new TextEncoder().encode(newData2));
+    assertEquals(
+      newData2,
+      new TextDecoder().decode(Deno.readFileSync(oldName))
+    );
+    // Writing to oldname also affects newname.
+    const newData3 = "ModifiedAgain";
+    Deno.writeFileSync(oldName, new TextEncoder().encode(newData3));
+    assertEquals(
+      newData3,
+      new TextDecoder().decode(Deno.readFileSync(newName))
+    );
+    // Remove oldname. File still accessible through newname.
+    Deno.removeSync(oldName);
+    const newNameStat = Deno.statSync(newName);
+    assert(newNameStat.isFile());
+    assert(!newNameStat.isSymlink()); // Not a symlink.
+    assertEquals(
+      newData3,
+      new TextDecoder().decode(Deno.readFileSync(newName))
+    );
+  }
+);
+
+unitTest(
+  { perms: { read: true, write: true } },
+  function linkSyncExists(): void {
+    const testDir = Deno.makeTempDirSync();
+    const oldName = testDir + "/oldname";
+    const newName = testDir + "/newname";
+    Deno.writeFileSync(oldName, new TextEncoder().encode("oldName"));
+    // newname is already created.
+    Deno.writeFileSync(newName, new TextEncoder().encode("newName"));
+
+    let err;
+    try {
+      Deno.linkSync(oldName, newName);
+    } catch (e) {
+      err = e;
+    }
+    assert(!!err);
+    assert(err instanceof Deno.errors.AlreadyExists);
+  }
+);
+
+unitTest(
+  { perms: { read: true, write: true } },
+  function linkSyncNotFound(): void {
+    const testDir = Deno.makeTempDirSync();
+    const oldName = testDir + "/oldname";
+    const newName = testDir + "/newname";
+
+    let err;
+    try {
+      Deno.linkSync(oldName, newName);
+    } catch (e) {
+      err = e;
+    }
+    assert(!!err);
+    assert(err instanceof Deno.errors.NotFound);
+  }
+);
+
+unitTest(
+  { perms: { read: false, write: true } },
+  function linkSyncReadPerm(): void {
+    let err;
+    try {
+      Deno.linkSync("oldbaddir", "newbaddir");
+    } catch (e) {
+      err = e;
+    }
+    assert(err instanceof Deno.errors.PermissionDenied);
+    assertEquals(err.name, "PermissionDenied");
+  }
+);
+
+unitTest(
+  { perms: { read: true, write: false } },
+  function linkSyncWritePerm(): void {
+    let err;
+    try {
+      Deno.linkSync("oldbaddir", "newbaddir");
+    } catch (e) {
+      err = e;
+    }
+    assert(err instanceof Deno.errors.PermissionDenied);
+    assertEquals(err.name, "PermissionDenied");
+  }
+);
+
+unitTest(
+  { perms: { read: true, write: true } },
+  async function linkSuccess(): Promise<void> {
+    const testDir = Deno.makeTempDirSync();
+    const oldData = "Hardlink";
+    const oldName = testDir + "/oldname";
+    const newName = testDir + "/newname";
+    Deno.writeFileSync(oldName, new TextEncoder().encode(oldData));
+    // Create the hard link.
+    await Deno.link(oldName, newName);
+    // We should expect reading the same content.
+    const newData = new TextDecoder().decode(Deno.readFileSync(newName));
+    assertEquals(oldData, newData);
+    // Writing to newname also affects oldname.
+    const newData2 = "Modified";
+    Deno.writeFileSync(newName, new TextEncoder().encode(newData2));
+    assertEquals(
+      newData2,
+      new TextDecoder().decode(Deno.readFileSync(oldName))
+    );
+    // Writing to oldname also affects newname.
+    const newData3 = "ModifiedAgain";
+    Deno.writeFileSync(oldName, new TextEncoder().encode(newData3));
+    assertEquals(
+      newData3,
+      new TextDecoder().decode(Deno.readFileSync(newName))
+    );
+    // Remove oldname. File still accessible through newname.
+    Deno.removeSync(oldName);
+    const newNameStat = Deno.statSync(newName);
+    assert(newNameStat.isFile());
+    assert(!newNameStat.isSymlink()); // Not a symlink.
+    assertEquals(
+      newData3,
+      new TextDecoder().decode(Deno.readFileSync(newName))
+    );
+  }
+);