From 86f92e04c79be81f98e5899638cb6fdb29a4fa64 Mon Sep 17 00:00:00 2001
From: Casper Beyer <caspervonb@pm.me>
Date: Sat, 20 Jun 2020 21:46:10 +0800
Subject: feat(unstable): add Deno.ftruncate and ftruncateSync (#6243)

---
 cli/tests/unit/truncate_test.ts | 44 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

(limited to 'cli/tests/unit/truncate_test.ts')

diff --git a/cli/tests/unit/truncate_test.ts b/cli/tests/unit/truncate_test.ts
index 014815702..82f8f03eb 100644
--- a/cli/tests/unit/truncate_test.ts
+++ b/cli/tests/unit/truncate_test.ts
@@ -1,6 +1,50 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import { unitTest, assertEquals, assert } from "./test_util.ts";
 
+unitTest(
+  { perms: { read: true, write: true } },
+  function ftruncateSyncSuccess(): void {
+    const filename = Deno.makeTempDirSync() + "/test_ftruncateSync.txt";
+    const file = Deno.openSync(filename, {
+      create: true,
+      read: true,
+      write: true,
+    });
+
+    Deno.ftruncateSync(file.rid, 20);
+    assertEquals(Deno.readFileSync(filename).byteLength, 20);
+    Deno.ftruncateSync(file.rid, 5);
+    assertEquals(Deno.readFileSync(filename).byteLength, 5);
+    Deno.ftruncateSync(file.rid, -5);
+    assertEquals(Deno.readFileSync(filename).byteLength, 0);
+
+    Deno.close(file.rid);
+    Deno.removeSync(filename);
+  }
+);
+
+unitTest(
+  { perms: { read: true, write: true } },
+  async function ftruncateSuccess(): Promise<void> {
+    const filename = Deno.makeTempDirSync() + "/test_ftruncate.txt";
+    const file = await Deno.open(filename, {
+      create: true,
+      read: true,
+      write: true,
+    });
+
+    await Deno.ftruncate(file.rid, 20);
+    assertEquals((await Deno.readFile(filename)).byteLength, 20);
+    await Deno.ftruncate(file.rid, 5);
+    assertEquals((await Deno.readFile(filename)).byteLength, 5);
+    await Deno.ftruncate(file.rid, -5);
+    assertEquals((await Deno.readFile(filename)).byteLength, 0);
+
+    Deno.close(file.rid);
+    await Deno.remove(filename);
+  }
+);
+
 unitTest(
   { perms: { read: true, write: true } },
   function truncateSyncSuccess(): void {
-- 
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