1 files changed, 55 insertions, 0 deletions
diff --git a/tests/unit/resources_test.ts b/tests/unit/resources_test.ts
new file mode 100644
index 000000000..bb0b9f2f8
--- /dev/null
+++ b/tests/unit/resources_test.ts
@@ -0,0 +1,55 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+import { assert, assertEquals, assertThrows } from "./test_util.ts";
+
+const listenPort = 4505;
+
+Deno.test(function resourcesCloseBadArgs() {
+  assertThrows(() => {
+    Deno.close((null as unknown) as number);
+  }, TypeError);
+});
+
+Deno.test(function resourcesStdio() {
+  const res = Deno.resources();
+
+  assertEquals(res[0], "stdin");
+  assertEquals(res[1], "stdout");
+  assertEquals(res[2], "stderr");
+});
+
+Deno.test({ permissions: { net: true } }, async function resourcesNet() {
+  const listener = Deno.listen({ port: listenPort });
+  const dialerConn = await Deno.connect({ port: listenPort });
+  const listenerConn = await listener.accept();
+
+  const res = Deno.resources();
+  assertEquals(
+    Object.values(res).filter((r): boolean => r === "tcpListener").length,
+    1,
+  );
+  const tcpStreams = Object.values(res).filter(
+    (r): boolean => r === "tcpStream",
+  );
+  assert(tcpStreams.length >= 2);
+
+  listenerConn.close();
+  dialerConn.close();
+  listener.close();
+});
+
+Deno.test({ permissions: { read: true } }, async function resourcesFile() {
+  const resourcesBefore = Deno.resources();
+  const f = await Deno.open("tests/testdata/assets/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 !Object.prototype.hasOwnProperty.call(resourcesBefore, rid);
+  })!;
+  assertEquals(resourcesAfter[newRid], "fsFile");
+});