1 files changed, 51 insertions, 0 deletions
diff --git a/cli/js/tests/resources_test.ts b/cli/js/tests/resources_test.ts
new file mode 100644
index 000000000..84b713a6d
--- /dev/null
+++ b/cli/js/tests/resources_test.ts
@@ -0,0 +1,51 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { unitTest, assertEquals } from "./test_util.ts";
+
+unitTest(function resourcesStdio(): void {
+  const res = Deno.resources();
+
+  assertEquals(res[0], "stdin");
+  assertEquals(res[1], "stdout");
+  assertEquals(res[2], "stderr");
+});
+
+unitTest({ perms: { net: true } }, async function resourcesNet(): Promise<
+  void
+> {
+  const listener = Deno.listen({ port: 4501 });
+  const dialerConn = await Deno.connect({ port: 4501 });
+  const listenerConn = await listener.accept();
+
+  const res = Deno.resources();
+  assertEquals(
+    Object.values(res).filter((r): boolean => r === "tcpListener").length,
+    1
+  );
+  assertEquals(
+    Object.values(res).filter((r): boolean => r === "tcpStream").length,
+    2
+  );
+
+  listenerConn.close();
+  dialerConn.close();
+  listener.close();
+});
+
+unitTest({ perms: { read: true } }, async function resourcesFile(): Promise<
+  void
+> {
+  const resourcesBefore = Deno.resources();
+  const f = await Deno.open("cli/tests/hello.txt");
+  const resourcesAfter = Deno.resources();
+  f.close();
+
+  // check that exactly one new resource (file) was added
+  assertEquals(
+    Object.keys(resourcesAfter).length,
+    Object.keys(resourcesBefore).length + 1
+  );
+  const newRid = +Object.keys(resourcesAfter).find((rid): boolean => {
+    return !resourcesBefore.hasOwnProperty(rid);
+  })!;
+  assertEquals(resourcesAfter[newRid], "fsFile");
+});