1 files changed, 218 insertions, 0 deletions
diff --git a/tests/unit/write_text_file_test.ts b/tests/unit/write_text_file_test.ts
new file mode 100644
index 000000000..a58d91997
--- /dev/null
+++ b/tests/unit/write_text_file_test.ts
@@ -0,0 +1,218 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+
+import {
+  assert,
+  assertEquals,
+  assertRejects,
+  assertThrows,
+} from "./test_util.ts";
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  function writeTextFileSyncSuccess() {
+    const filename = Deno.makeTempDirSync() + "/test.txt";
+    Deno.writeTextFileSync(filename, "Hello");
+    const dataRead = Deno.readTextFileSync(filename);
+    assertEquals(dataRead, "Hello");
+  },
+);
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  function writeTextFileSyncByUrl() {
+    const tempDir = Deno.makeTempDirSync();
+    const fileUrl = new URL(
+      `file://${Deno.build.os === "windows" ? "/" : ""}${tempDir}/test.txt`,
+    );
+    Deno.writeTextFileSync(fileUrl, "Hello");
+    const dataRead = Deno.readTextFileSync(fileUrl);
+    assertEquals(dataRead, "Hello");
+
+    Deno.removeSync(fileUrl, { recursive: true });
+  },
+);
+
+Deno.test({ permissions: { write: true } }, function writeTextFileSyncFail() {
+  const filename = "/baddir/test.txt";
+  // The following should fail because /baddir doesn't exist (hopefully).
+  assertThrows(() => {
+    Deno.writeTextFileSync(filename, "hello");
+  }, Deno.errors.NotFound);
+});
+
+Deno.test({ permissions: { write: false } }, function writeTextFileSyncPerm() {
+  const filename = "/baddir/test.txt";
+  // The following should fail due to no write permission
+  assertThrows(() => {
+    Deno.writeTextFileSync(filename, "Hello");
+  }, Deno.errors.PermissionDenied);
+});
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  function writeTextFileSyncUpdateMode() {
+    if (Deno.build.os !== "windows") {
+      const data = "Hello";
+      const filename = Deno.makeTempDirSync() + "/test.txt";
+      Deno.writeTextFileSync(filename, data, { mode: 0o755 });
+      assertEquals(Deno.statSync(filename).mode! & 0o777, 0o755);
+      Deno.writeTextFileSync(filename, data, { mode: 0o666 });
+      assertEquals(Deno.statSync(filename).mode! & 0o777, 0o666);
+    }
+  },
+);
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  function writeTextFileSyncCreate() {
+    const data = "Hello";
+    const filename = Deno.makeTempDirSync() + "/test.txt";
+    let caughtError = false;
+    // if create turned off, the file won't be created
+    try {
+      Deno.writeTextFileSync(filename, data, { create: false });
+    } catch (e) {
+      caughtError = true;
+      assert(e instanceof Deno.errors.NotFound);
+    }
+    assert(caughtError);
+
+    // Turn on create, should have no error
+    Deno.writeTextFileSync(filename, data, { create: true });
+    Deno.writeTextFileSync(filename, data, { create: false });
+    assertEquals(Deno.readTextFileSync(filename), "Hello");
+  },
+);
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  function writeTextFileSyncAppend() {
+    const data = "Hello";
+    const filename = Deno.makeTempDirSync() + "/test.txt";
+    Deno.writeTextFileSync(filename, data);
+    Deno.writeTextFileSync(filename, data, { append: true });
+    assertEquals(Deno.readTextFileSync(filename), "HelloHello");
+    // Now attempt overwrite
+    Deno.writeTextFileSync(filename, data, { append: false });
+    assertEquals(Deno.readTextFileSync(filename), "Hello");
+    // append not set should also overwrite
+    Deno.writeTextFileSync(filename, data);
+    assertEquals(Deno.readTextFileSync(filename), "Hello");
+  },
+);
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  async function writeTextFileSuccess() {
+    const filename = Deno.makeTempDirSync() + "/test.txt";
+    await Deno.writeTextFile(filename, "Hello");
+    const dataRead = Deno.readTextFileSync(filename);
+    assertEquals(dataRead, "Hello");
+  },
+);
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  async function writeTextFileByUrl() {
+    const tempDir = Deno.makeTempDirSync();
+    const fileUrl = new URL(
+      `file://${Deno.build.os === "windows" ? "/" : ""}${tempDir}/test.txt`,
+    );
+    await Deno.writeTextFile(fileUrl, "Hello");
+    const dataRead = Deno.readTextFileSync(fileUrl);
+    assertEquals(dataRead, "Hello");
+
+    Deno.removeSync(fileUrl, { recursive: true });
+  },
+);
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  async function writeTextFileNotFound() {
+    const filename = "/baddir/test.txt";
+    // The following should fail because /baddir doesn't exist (hopefully).
+    await assertRejects(async () => {
+      await Deno.writeTextFile(filename, "Hello");
+    }, Deno.errors.NotFound);
+  },
+);
+
+Deno.test(
+  { permissions: { write: false } },
+  async function writeTextFilePerm() {
+    const filename = "/baddir/test.txt";
+    // The following should fail due to no write permission
+    await assertRejects(async () => {
+      await Deno.writeTextFile(filename, "Hello");
+    }, Deno.errors.PermissionDenied);
+  },
+);
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  async function writeTextFileUpdateMode() {
+    if (Deno.build.os !== "windows") {
+      const data = "Hello";
+      const filename = Deno.makeTempDirSync() + "/test.txt";
+      await Deno.writeTextFile(filename, data, { mode: 0o755 });
+      assertEquals(Deno.statSync(filename).mode! & 0o777, 0o755);
+      await Deno.writeTextFile(filename, data, { mode: 0o666 });
+      assertEquals(Deno.statSync(filename).mode! & 0o777, 0o666);
+    }
+  },
+);
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  async function writeTextFileCreate() {
+    const data = "Hello";
+    const filename = Deno.makeTempDirSync() + "/test.txt";
+    let caughtError = false;
+    // if create turned off, the file won't be created
+    try {
+      await Deno.writeTextFile(filename, data, { create: false });
+    } catch (e) {
+      caughtError = true;
+      assert(e instanceof Deno.errors.NotFound);
+    }
+    assert(caughtError);
+
+    // Turn on create, should have no error
+    await Deno.writeTextFile(filename, data, { create: true });
+    await Deno.writeTextFile(filename, data, { create: false });
+    assertEquals(Deno.readTextFileSync(filename), "Hello");
+  },
+);
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  async function writeTextFileAppend() {
+    const data = "Hello";
+    const filename = Deno.makeTempDirSync() + "/test.txt";
+    await Deno.writeTextFile(filename, data);
+    await Deno.writeTextFile(filename, data, { append: true });
+    assertEquals(Deno.readTextFileSync(filename), "HelloHello");
+    // Now attempt overwrite
+    await Deno.writeTextFile(filename, data, { append: false });
+    assertEquals(Deno.readTextFileSync(filename), "Hello");
+    // append not set should also overwrite
+    await Deno.writeTextFile(filename, data);
+    assertEquals(Deno.readTextFileSync(filename), "Hello");
+  },
+);
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  async function writeTextFileStream() {
+    const stream = new ReadableStream({
+      pull(controller) {
+        controller.enqueue("Hello");
+        controller.enqueue("World");
+        controller.close();
+      },
+    });
+    const filename = Deno.makeTempDirSync() + "/test.txt";
+    await Deno.writeTextFile(filename, stream);
+    assertEquals(Deno.readTextFileSync(filename), "HelloWorld");
+  },
+);