1 files changed, 32 insertions, 0 deletions
diff --git a/cli/tests/unit/stdio_test.ts b/cli/tests/unit/stdio_test.ts
new file mode 100644
index 000000000..244ebcd47
--- /dev/null
+++ b/cli/tests/unit/stdio_test.ts
@@ -0,0 +1,32 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { unitTest, assertEquals } from "./test_util.ts";
+
+unitTest(async function stdioStdinRead() {
+  const nread = await Deno.stdin.read(new Uint8Array(0));
+  assertEquals(nread, 0);
+});
+
+unitTest(function stdioStdinReadSync() {
+  const nread = Deno.stdin.readSync(new Uint8Array(0));
+  assertEquals(nread, 0);
+});
+
+unitTest(async function stdioStdoutWrite() {
+  const nwritten = await Deno.stdout.write(new Uint8Array(0));
+  assertEquals(nwritten, 0);
+});
+
+unitTest(function stdioStdoutWriteSync() {
+  const nwritten = Deno.stdout.writeSync(new Uint8Array(0));
+  assertEquals(nwritten, 0);
+});
+
+unitTest(async function stdioStderrWrite() {
+  const nwritten = await Deno.stderr.write(new Uint8Array(0));
+  assertEquals(nwritten, 0);
+});
+
+unitTest(function stdioStderrWriteSync() {
+  const nwritten = Deno.stderr.writeSync(new Uint8Array(0));
+  assertEquals(nwritten, 0);
+});