1 files changed, 208 insertions, 0 deletions
diff --git a/tests/unit/read_text_file_test.ts b/tests/unit/read_text_file_test.ts
new file mode 100644
index 000000000..94aa5f0a8
--- /dev/null
+++ b/tests/unit/read_text_file_test.ts
@@ -0,0 +1,208 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+
+import {
+  assert,
+  assertEquals,
+  assertRejects,
+  assertThrows,
+  pathToAbsoluteFileUrl,
+  unreachable,
+} from "./test_util.ts";
+
+Deno.test({ permissions: { read: true } }, function readTextFileSyncSuccess() {
+  const data = Deno.readTextFileSync("tests/testdata/assets/fixture.json");
+  assert(data.length > 0);
+  const pkg = JSON.parse(data);
+  assertEquals(pkg.name, "deno");
+});
+
+Deno.test({ permissions: { read: true } }, function readTextFileSyncByUrl() {
+  const data = Deno.readTextFileSync(
+    pathToAbsoluteFileUrl("tests/testdata/assets/fixture.json"),
+  );
+  assert(data.length > 0);
+  const pkg = JSON.parse(data);
+  assertEquals(pkg.name, "deno");
+});
+
+Deno.test({ permissions: { read: false } }, function readTextFileSyncPerm() {
+  assertThrows(() => {
+    Deno.readTextFileSync("tests/testdata/assets/fixture.json");
+  }, Deno.errors.PermissionDenied);
+});
+
+Deno.test({ permissions: { read: true } }, function readTextFileSyncNotFound() {
+  assertThrows(() => {
+    Deno.readTextFileSync("bad_filename");
+  }, Deno.errors.NotFound);
+});
+
+Deno.test(
+  { permissions: { read: true } },
+  async function readTextFileSuccess() {
+    const data = await Deno.readTextFile(
+      "tests/testdata/assets/fixture.json",
+    );
+    assert(data.length > 0);
+    const pkg = JSON.parse(data);
+    assertEquals(pkg.name, "deno");
+  },
+);
+
+Deno.test({ permissions: { read: true } }, async function readTextFileByUrl() {
+  const data = await Deno.readTextFile(
+    pathToAbsoluteFileUrl("tests/testdata/assets/fixture.json"),
+  );
+  assert(data.length > 0);
+  const pkg = JSON.parse(data);
+  assertEquals(pkg.name, "deno");
+});
+
+Deno.test({ permissions: { read: false } }, async function readTextFilePerm() {
+  await assertRejects(async () => {
+    await Deno.readTextFile("tests/testdata/assets/fixture.json");
+  }, Deno.errors.PermissionDenied);
+});
+
+Deno.test({ permissions: { read: true } }, function readTextFileSyncLoop() {
+  for (let i = 0; i < 256; i++) {
+    Deno.readTextFileSync("tests/testdata/assets/fixture.json");
+  }
+});
+
+Deno.test(
+  { permissions: { read: true } },
+  async function readTextFileDoesNotLeakResources() {
+    await assertRejects(async () => await Deno.readTextFile("cli"));
+  },
+);
+
+Deno.test(
+  { permissions: { read: true } },
+  function readTextFileSyncDoesNotLeakResources() {
+    assertThrows(() => Deno.readTextFileSync("cli"));
+  },
+);
+
+Deno.test(
+  { permissions: { read: true } },
+  async function readTextFileWithAbortSignal() {
+    const ac = new AbortController();
+    queueMicrotask(() => ac.abort());
+    const error = await assertRejects(
+      async () => {
+        await Deno.readTextFile("tests/testdata/assets/fixture.json", {
+          signal: ac.signal,
+        });
+      },
+    );
+    assert(error instanceof DOMException);
+    assertEquals(error.name, "AbortError");
+  },
+);
+
+Deno.test(
+  { permissions: { read: true } },
+  async function readTextFileWithAbortSignalReason() {
+    const ac = new AbortController();
+    const abortReason = new Error();
+    queueMicrotask(() => ac.abort(abortReason));
+    const error = await assertRejects(
+      async () => {
+        await Deno.readTextFile("tests/testdata/assets/fixture.json", {
+          signal: ac.signal,
+        });
+      },
+    );
+    assertEquals(error, abortReason);
+  },
+);
+
+Deno.test(
+  { permissions: { read: true } },
+  async function readTextFileWithAbortSignalPrimitiveReason() {
+    const ac = new AbortController();
+    queueMicrotask(() => ac.abort("Some string"));
+    try {
+      await Deno.readTextFile("tests/testdata/assets/fixture.json", {
+        signal: ac.signal,
+      });
+      unreachable();
+    } catch (e) {
+      assertEquals(e, "Some string");
+    }
+  },
+);
+
+// Test that AbortController's cancel handle is cleaned-up correctly, and do not leak resources.
+Deno.test(
+  { permissions: { read: true } },
+  async function readTextFileWithAbortSignalNotCalled() {
+    const ac = new AbortController();
+    await Deno.readTextFile("tests/testdata/assets/fixture.json", {
+      signal: ac.signal,
+    });
+  },
+);
+
+Deno.test(
+  { permissions: { read: true }, ignore: Deno.build.os !== "linux" },
+  async function readTextFileProcFs() {
+    const data = await Deno.readTextFile("/proc/self/stat");
+    assert(data.length > 0);
+  },
+);
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  function readTextFileSyncV8LimitError() {
+    const kStringMaxLengthPlusOne = 536870888 + 1;
+    const bytes = new Uint8Array(kStringMaxLengthPlusOne);
+    const filePath = "tests/testdata/too_big_a_file.txt";
+
+    try {
+      Deno.writeFileSync(filePath, bytes);
+    } catch {
+      // NOTE(bartlomieju): writing a 0.5Gb file might be too much for CI,
+      // so skip running if writing fails.
+      return;
+    }
+
+    assertThrows(
+      () => {
+        Deno.readTextFileSync(filePath);
+      },
+      TypeError,
+      "buffer exceeds maximum length",
+    );
+
+    Deno.removeSync(filePath);
+  },
+);
+
+Deno.test(
+  { permissions: { read: true, write: true } },
+  async function readTextFileV8LimitError() {
+    const kStringMaxLengthPlusOne = 536870888 + 1;
+    const bytes = new Uint8Array(kStringMaxLengthPlusOne);
+    const filePath = "tests/testdata/too_big_a_file_2.txt";
+
+    try {
+      await Deno.writeFile(filePath, bytes);
+    } catch {
+      // NOTE(bartlomieju): writing a 0.5Gb file might be too much for CI,
+      // so skip running if writing fails.
+      return;
+    }
+
+    await assertRejects(
+      async () => {
+        await Deno.readTextFile(filePath);
+      },
+      TypeError,
+      "buffer exceeds maximum length",
+    );
+
+    await Deno.remove(filePath);
+  },
+);