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

1 files changed, 79 insertions, 0 deletions

diff --git a/cli/js/tests/write_text_file_test.ts b/cli/js/tests/write_text_file_test.ts
new file mode 100644
index 000000000..321189b0e
--- /dev/null
+++ b/cli/js/tests/write_text_file_test.ts
@@ -0,0 +1,79 @@
+import { unitTest, assert, assertEquals } from "./test_util.ts";
+
+unitTest(
+  { perms: { read: true, write: true } },
+  function writeTextFileSyncSuccess(): void {
+    const filename = Deno.makeTempDirSync() + "/test.txt";
+    Deno.writeTextFileSync(filename, "Hello");
+    const dataRead = Deno.readTextFileSync(filename);
+    assertEquals("Hello", dataRead);
+  }
+);
+
+unitTest({ perms: { write: true } }, function writeTextFileSyncFail(): void {
+  const filename = "/baddir/test.txt";
+  // The following should fail because /baddir doesn't exist (hopefully).
+  let caughtError = false;
+  try {
+    Deno.writeTextFileSync(filename, "hello");
+  } catch (e) {
+    caughtError = true;
+    assert(e instanceof Deno.errors.NotFound);
+  }
+  assert(caughtError);
+});
+
+unitTest({ perms: { write: false } }, function writeTextFileSyncPerm(): void {
+  const filename = "/baddir/test.txt";
+  // The following should fail due to no write permission
+  let caughtError = false;
+  try {
+    Deno.writeTextFileSync(filename, "Hello");
+  } catch (e) {
+    caughtError = true;
+    assert(e instanceof Deno.errors.PermissionDenied);
+  }
+  assert(caughtError);
+});
+
+unitTest(
+  { perms: { read: true, write: true } },
+  async function writeTextFileSuccess(): Promise<void> {
+    const filename = Deno.makeTempDirSync() + "/test.txt";
+    await Deno.writeTextFile(filename, "Hello");
+    const dataRead = Deno.readTextFileSync(filename);
+    assertEquals("Hello", dataRead);
+  }
+);
+
+unitTest(
+  { perms: { read: true, write: true } },
+  async function writeTextFileNotFound(): Promise<void> {
+    const filename = "/baddir/test.txt";
+    // The following should fail because /baddir doesn't exist (hopefully).
+    let caughtError = false;
+    try {
+      await Deno.writeTextFile(filename, "Hello");
+    } catch (e) {
+      caughtError = true;
+      assert(e instanceof Deno.errors.NotFound);
+    }
+    assert(caughtError);
+  }
+);
+
+unitTest(
+  { perms: { write: false } },
+  async function writeTextFilePerm(): Promise<void> {
+    const filename = "/baddir/test.txt";
+    // The following should fail due to no write permission
+    let caughtError = false;
+    try {
+      await Deno.writeTextFile(filename, "Hello");
+    } catch (e) {
+      caughtError = true;
+      assert(e instanceof Deno.errors.PermissionDenied);
+    }
+    assert(caughtError);
+  }
+);