1 files changed, 57 insertions, 0 deletions
diff --git a/cli/js/read_file_test.ts b/cli/js/read_file_test.ts
new file mode 100644
index 000000000..7d4f4789c
--- /dev/null
+++ b/cli/js/read_file_test.ts
@@ -0,0 +1,57 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import { testPerm, assert, assertEquals } from "./test_util.ts";
+
+testPerm({ read: true }, function readFileSyncSuccess(): void {
+  const data = Deno.readFileSync("package.json");
+  assert(data.byteLength > 0);
+  const decoder = new TextDecoder("utf-8");
+  const json = decoder.decode(data);
+  const pkg = JSON.parse(json);
+  assertEquals(pkg.name, "deno");
+});
+
+testPerm({ read: false }, function readFileSyncPerm(): void {
+  let caughtError = false;
+  try {
+    Deno.readFileSync("package.json");
+  } catch (e) {
+    caughtError = true;
+    assertEquals(e.kind, Deno.ErrorKind.PermissionDenied);
+    assertEquals(e.name, "PermissionDenied");
+  }
+  assert(caughtError);
+});
+
+testPerm({ read: true }, function readFileSyncNotFound(): void {
+  let caughtError = false;
+  let data;
+  try {
+    data = Deno.readFileSync("bad_filename");
+  } catch (e) {
+    caughtError = true;
+    assertEquals(e.kind, Deno.ErrorKind.NotFound);
+  }
+  assert(caughtError);
+  assert(data === undefined);
+});
+
+testPerm({ read: true }, async function readFileSuccess(): Promise<void> {
+  const data = await Deno.readFile("package.json");
+  assert(data.byteLength > 0);
+  const decoder = new TextDecoder("utf-8");
+  const json = decoder.decode(data);
+  const pkg = JSON.parse(json);
+  assertEquals(pkg.name, "deno");
+});
+
+testPerm({ read: false }, async function readFilePerm(): Promise<void> {
+  let caughtError = false;
+  try {
+    await Deno.readFile("package.json");
+  } catch (e) {
+    caughtError = true;
+    assertEquals(e.kind, Deno.ErrorKind.PermissionDenied);
+    assertEquals(e.name, "PermissionDenied");
+  }
+  assert(caughtError);
+});