1 files changed, 65 insertions, 0 deletions
diff --git a/cli/tests/unit/read_file_test.ts b/cli/tests/unit/read_file_test.ts
new file mode 100644
index 000000000..0d3cdf422
--- /dev/null
+++ b/cli/tests/unit/read_file_test.ts
@@ -0,0 +1,65 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { unitTest, assert, assertEquals } from "./test_util.ts";
+
+unitTest({ perms: { read: true } }, function readFileSyncSuccess(): void {
+  const data = Deno.readFileSync("cli/tests/fixture.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");
+});
+
+unitTest({ perms: { read: false } }, function readFileSyncPerm(): void {
+  let caughtError = false;
+  try {
+    Deno.readFileSync("cli/tests/fixture.json");
+  } catch (e) {
+    caughtError = true;
+    assert(e instanceof Deno.errors.PermissionDenied);
+  }
+  assert(caughtError);
+});
+
+unitTest({ perms: { read: true } }, function readFileSyncNotFound(): void {
+  let caughtError = false;
+  let data;
+  try {
+    data = Deno.readFileSync("bad_filename");
+  } catch (e) {
+    caughtError = true;
+    assert(e instanceof Deno.errors.NotFound);
+  }
+  assert(caughtError);
+  assert(data === undefined);
+});
+
+unitTest({ perms: { read: true } }, async function readFileSuccess(): Promise<
+  void
+> {
+  const data = await Deno.readFile("cli/tests/fixture.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");
+});
+
+unitTest({ perms: { read: false } }, async function readFilePerm(): Promise<
+  void
+> {
+  let caughtError = false;
+  try {
+    await Deno.readFile("cli/tests/fixture.json");
+  } catch (e) {
+    caughtError = true;
+    assert(e instanceof Deno.errors.PermissionDenied);
+  }
+  assert(caughtError);
+});
+
+unitTest({ perms: { read: true } }, function readFileSyncLoop(): void {
+  for (let i = 0; i < 256; i++) {
+    Deno.readFileSync("cli/tests/fixture.json");
+  }
+});