1 files changed, 14 insertions, 2 deletions
diff --git a/tests.ts b/tests.ts
index 702f6406d..b2c7ee513 100644
--- a/tests.ts
+++ b/tests.ts
@@ -2,7 +2,7 @@
 // But it can also be run manually:
 //  ./deno tests.ts
 import { test, assert, assertEqual } from "./deno_testing/testing.ts";
-import { readFileSync } from "deno";
+import { readFileSync, writeFileSync } from "deno";
 
 test(async function tests_test() {
   assert(true);
@@ -21,8 +21,20 @@ test(async function tests_readFileSync() {
   assertEqual(pkg.name, "deno");
 });
 
+test(async function tests_writeFileSync() {
+  const enc = new TextEncoder();
+  const data = enc.encode("Hello");
+  // TODO need ability to get tmp dir.
+  const fn = "/tmp/test.txt";
+  writeFileSync("/tmp/test.txt", data, 0o666);
+  const dataRead = readFileSync("/tmp/test.txt");
+  const dec = new TextDecoder("utf-8");
+  const actual = dec.decode(dataRead);
+  assertEqual("Hello", actual);
+});
+
 test(async function tests_fetch() {
-  const response = await fetch('http://localhost:4545/package.json');
+  const response = await fetch("http://localhost:4545/package.json");
   const json = await response.json();
   assertEqual(json.name, "deno");
 });