From b81e5db17aa8b3088d6034ddf86b79c69410f012 Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Fri, 4 Oct 2019 20:28:51 -0400
Subject: Merge deno_cli_snapshots into deno_cli (#3064)

---
 cli/js/truncate_test.ts | 74 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 cli/js/truncate_test.ts

(limited to 'cli/js/truncate_test.ts')

diff --git a/cli/js/truncate_test.ts b/cli/js/truncate_test.ts
new file mode 100644
index 000000000..055db8652
--- /dev/null
+++ b/cli/js/truncate_test.ts
@@ -0,0 +1,74 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import { testPerm, assertEquals } from "./test_util.ts";
+
+function readDataSync(name: string): string {
+  const data = Deno.readFileSync(name);
+  const decoder = new TextDecoder("utf-8");
+  const text = decoder.decode(data);
+  return text;
+}
+
+async function readData(name: string): Promise<string> {
+  const data = await Deno.readFile(name);
+  const decoder = new TextDecoder("utf-8");
+  const text = decoder.decode(data);
+  return text;
+}
+
+testPerm({ read: true, write: true }, function truncateSyncSuccess(): void {
+  const enc = new TextEncoder();
+  const d = enc.encode("Hello");
+  const filename = Deno.makeTempDirSync() + "/test_truncateSync.txt";
+  Deno.writeFileSync(filename, d);
+  Deno.truncateSync(filename, 20);
+  let data = readDataSync(filename);
+  assertEquals(data.length, 20);
+  Deno.truncateSync(filename, 5);
+  data = readDataSync(filename);
+  assertEquals(data.length, 5);
+  Deno.truncateSync(filename, -5);
+  data = readDataSync(filename);
+  assertEquals(data.length, 0);
+  Deno.removeSync(filename);
+});
+
+testPerm({ read: true, write: true }, async function truncateSuccess(): Promise<
+  void
+> {
+  const enc = new TextEncoder();
+  const d = enc.encode("Hello");
+  const filename = Deno.makeTempDirSync() + "/test_truncate.txt";
+  await Deno.writeFile(filename, d);
+  await Deno.truncate(filename, 20);
+  let data = await readData(filename);
+  assertEquals(data.length, 20);
+  await Deno.truncate(filename, 5);
+  data = await readData(filename);
+  assertEquals(data.length, 5);
+  await Deno.truncate(filename, -5);
+  data = await readData(filename);
+  assertEquals(data.length, 0);
+  await Deno.remove(filename);
+});
+
+testPerm({ write: false }, function truncateSyncPerm(): void {
+  let err;
+  try {
+    Deno.mkdirSync("/test_truncateSyncPermission.txt");
+  } catch (e) {
+    err = e;
+  }
+  assertEquals(err.kind, Deno.ErrorKind.PermissionDenied);
+  assertEquals(err.name, "PermissionDenied");
+});
+
+testPerm({ write: false }, async function truncatePerm(): Promise<void> {
+  let err;
+  try {
+    await Deno.mkdir("/test_truncatePermission.txt");
+  } catch (e) {
+    err = e;
+  }
+  assertEquals(err.kind, Deno.ErrorKind.PermissionDenied);
+  assertEquals(err.name, "PermissionDenied");
+});
-- 
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