refactor(std/example): Inconsistencies in the example tests (#7684)

1 files changed, 29 insertions, 0 deletions

diff --git a/std/examples/cat_test.ts b/std/examples/cat_test.ts
new file mode 100644
index 000000000..cd88d1f3d
--- /dev/null
+++ b/std/examples/cat_test.ts
@@ -0,0 +1,29 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { assertStrictEquals } from "../testing/asserts.ts";
+import { dirname, fromFileUrl } from "../path/mod.ts";
+
+const moduleDir = dirname(fromFileUrl(import.meta.url));
+
+Deno.test("[examples/cat] print multiple files", async () => {
+  const decoder = new TextDecoder();
+  const process = Deno.run({
+    cmd: [
+      Deno.execPath(),
+      "run",
+      "--allow-read",
+      "cat.ts",
+      "testdata/cat/hello.txt",
+      "testdata/cat/world.txt",
+    ],
+    cwd: moduleDir,
+    stdout: "piped",
+  });
+
+  try {
+    const output = await process.output();
+    const actual = decoder.decode(output).trim();
+    assertStrictEquals(actual, "Hello\nWorld");
+  } finally {
+    process.close();
+  }
+});