fix(#4769) Adds readTextFile, writeTextFile, with sync counterparts (#4901)

1 files changed, 61 insertions, 0 deletions

diff --git a/cli/js/tests/read_text_file_test.ts b/cli/js/tests/read_text_file_test.ts
new file mode 100644
index 000000000..3e7493e4a
--- /dev/null
+++ b/cli/js/tests/read_text_file_test.ts
@@ -0,0 +1,61 @@
+import { unitTest, assert, assertEquals } from "./test_util.ts";
+
+unitTest({ perms: { read: true } }, function readTextFileSyncSuccess(): void {
+  const data = Deno.readTextFileSync("cli/tests/fixture.json");
+  assert(data.length > 0);
+  const pkg = JSON.parse(data);
+  assertEquals(pkg.name, "deno");
+});
+
+unitTest({ perms: { read: false } }, function readTextFileSyncPerm(): void {
+  let caughtError = false;
+  try {
+    Deno.readTextFileSync("cli/tests/fixture.json");
+  } catch (e) {
+    caughtError = true;
+    assert(e instanceof Deno.errors.PermissionDenied);
+  }
+  assert(caughtError);
+});
+
+unitTest({ perms: { read: true } }, function readTextFileSyncNotFound(): void {
+  let caughtError = false;
+  let data;
+  try {
+    data = Deno.readTextFileSync("bad_filename");
+  } catch (e) {
+    caughtError = true;
+    assert(e instanceof Deno.errors.NotFound);
+  }
+  assert(caughtError);
+  assert(data === undefined);
+});
+
+unitTest(
+  { perms: { read: true } },
+  async function readTextFileSuccess(): Promise<void> {
+    const data = await Deno.readTextFile("cli/tests/fixture.json");
+    assert(data.length > 0);
+    const pkg = JSON.parse(data);
+    assertEquals(pkg.name, "deno");
+  }
+);
+
+unitTest({ perms: { read: false } }, async function readTextFilePerm(): Promise<
+  void
+> {
+  let caughtError = false;
+  try {
+    await Deno.readTextFile("cli/tests/fixture.json");
+  } catch (e) {
+    caughtError = true;
+    assert(e instanceof Deno.errors.PermissionDenied);
+  }
+  assert(caughtError);
+});
+
+unitTest({ perms: { read: true } }, function readTextFileSyncLoop(): void {
+  for (let i = 0; i < 256; i++) {
+    Deno.readTextFileSync("cli/tests/fixture.json");
+  }
+});