feat: add ensureDir/ensureFile for fs modules (denoland/deno_std#264)

Original: https://github.com/denoland/deno_std/commit/9ae941338aea09adf0d4f48d40f2b09131ae3d5f

1 files changed, 71 insertions, 0 deletions

diff --git a/fs/ensure_file_test.ts b/fs/ensure_file_test.ts
new file mode 100644
index 000000000..b98d7c4e0
--- /dev/null
+++ b/fs/ensure_file_test.ts
@@ -0,0 +1,71 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import { test } from "../testing/mod.ts";
+import { assertThrows, assertThrowsAsync } from "../testing/asserts.ts";
+import { ensureFile, ensureFileSync } from "./ensure_file.ts";
+import * as path from "./path/mod.ts";
+
+const testdataDir = path.resolve("fs", "testdata");
+
+test(async function ensureFileIfItNotExist() {
+  const testDir = path.join(testdataDir, "ensure_file_1");
+  const testFile = path.join(testDir, "test.txt");
+
+  await ensureFile(testFile);
+
+  assertThrowsAsync(async () => {
+    await Deno.stat(testFile).then(() => {
+      throw new Error("test file should exists.");
+    });
+  });
+
+  await Deno.remove(testDir, { recursive: true });
+});
+
+test(function ensureFileSyncIfItNotExist() {
+  const testDir = path.join(testdataDir, "ensure_file_2");
+  const testFile = path.join(testDir, "test.txt");
+
+  ensureFileSync(testFile);
+
+  assertThrows(() => {
+    Deno.statSync(testFile);
+    throw new Error("test file should exists.");
+  });
+
+  Deno.removeSync(testDir, { recursive: true });
+});
+
+test(async function ensureFileIfItExist() {
+  const testDir = path.join(testdataDir, "ensure_file_3");
+  const testFile = path.join(testDir, "test.txt");
+
+  await Deno.mkdir(testDir, true);
+  await Deno.writeFile(testFile, new Uint8Array());
+
+  await ensureFile(testFile);
+
+  assertThrowsAsync(async () => {
+    await Deno.stat(testFile).then(() => {
+      throw new Error("test file should exists.");
+    });
+  });
+
+  await Deno.remove(testDir, { recursive: true });
+});
+
+test(function ensureFileSyncIfItExist() {
+  const testDir = path.join(testdataDir, "ensure_file_4");
+  const testFile = path.join(testDir, "test.txt");
+
+  Deno.mkdirSync(testDir, true);
+  Deno.writeFileSync(testFile, new Uint8Array());
+
+  ensureFileSync(testFile);
+
+  assertThrows(() => {
+    Deno.statSync(testFile);
+    throw new Error("test file should exists.");
+  });
+
+  Deno.removeSync(testDir, { recursive: true });
+});