Move writeFileSync to write_file.ts, add writeFile and tests (#728)

js/write_file_test.ts

@@ -0,0 +1,89 @@
+// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+import { testPerm, assert, assertEqual } from "./test_util.ts";
+import * as deno from "deno";
+
+testPerm({ write: true }, function writeFileSyncSuccess() {
+  const enc = new TextEncoder();
+  const data = enc.encode("Hello");
+  const filename = deno.makeTempDirSync() + "/test.txt";
+  deno.writeFileSync(filename, data, 0o666);
+  const dataRead = deno.readFileSync(filename);
+  const dec = new TextDecoder("utf-8");
+  const actual = dec.decode(dataRead);
+  assertEqual("Hello", actual);
+});
+
+testPerm({ write: true }, function writeFileSyncFail() {
+  const enc = new TextEncoder();
+  const data = enc.encode("Hello");
+  const filename = "/baddir/test.txt";
+  // The following should fail because /baddir doesn't exist (hopefully).
+  let caughtError = false;
+  try {
+    deno.writeFileSync(filename, data);
+  } catch (e) {
+    caughtError = true;
+    assertEqual(e.kind, deno.ErrorKind.NotFound);
+    assertEqual(e.name, "NotFound");
+  }
+  assert(caughtError);
+});
+
+testPerm({ write: false }, function writeFileSyncPerm() {
+  const enc = new TextEncoder();
+  const data = enc.encode("Hello");
+  const filename = "/baddir/test.txt";
+  // The following should fail due to no write permission
+  let caughtError = false;
+  try {
+    deno.writeFileSync(filename, data);
+  } catch (e) {
+    caughtError = true;
+    assertEqual(e.kind, deno.ErrorKind.PermissionDenied);
+    assertEqual(e.name, "PermissionDenied");
+  }
+  assert(caughtError);
+});
+
+testPerm({ write: true }, async function writeFileSuccess() {
+  const enc = new TextEncoder();
+  const data = enc.encode("Hello");
+  const filename = deno.makeTempDirSync() + "/test.txt";
+  await deno.writeFile(filename, data, 0o666);
+  const dataRead = deno.readFileSync(filename);
+  const dec = new TextDecoder("utf-8");
+  const actual = dec.decode(dataRead);
+  assertEqual("Hello", actual);
+});
+
+testPerm({ write: true }, async function writeFileNotFound() {
+  const enc = new TextEncoder();
+  const data = enc.encode("Hello");
+  const filename = "/baddir/test.txt";
+  // The following should fail because /baddir doesn't exist (hopefully).
+  let caughtError = false;
+  try {
+    await deno.writeFile(filename, data);
+  } catch (e) {
+    caughtError = true;
+    assertEqual(e.kind, deno.ErrorKind.NotFound);
+    assertEqual(e.name, "NotFound");
+  }
+  assert(caughtError);
+});
+
+testPerm({ write: false }, async function writeFilePerm() {
+  const enc = new TextEncoder();
+  const data = enc.encode("Hello");
+  const filename = "/baddir/test.txt";
+  // The following should fail due to no write permission
+  let caughtError = false;
+  try {
+    await deno.writeFile(filename, data);
+  } catch (e) {
+    caughtError = true;
+    assertEqual(e.kind, deno.ErrorKind.PermissionDenied);
+    assertEqual(e.name, "PermissionDenied");
+  }
+  assert(caughtError);
+});