Serve directory for file server & Fix bufio flush bug (denoland/deno_std#15)

Original: b78f4e9fbd

file_server_test.ts

@@ -0,0 +1,46 @@
+import { readFile } from "deno";
+
+import {
+  test,
+  assert,
+  assertEqual
+} from "https://deno.land/x/testing/testing.ts";
+
+// Promise to completeResolve when all tests completes
+let completeResolve;
+export const completePromise = new Promise(res => (completeResolve = res));
+let completedTestCount = 0;
+
+function maybeCompleteTests() {
+  completedTestCount++;
+  // Change this when adding more tests
+  if (completedTestCount === 3) {
+    completeResolve();
+  }
+}
+
+export function runTests(serverReadyPromise: Promise<any>) {
+  test(async function serveFile() {
+    await serverReadyPromise;
+    const res = await fetch("http://localhost:4500/.travis.yml");
+    const downloadedFile = await res.text();
+    const localFile = new TextDecoder().decode(await readFile("./.travis.yml"));
+    assertEqual(downloadedFile, localFile);
+    maybeCompleteTests();
+  });
+
+  test(async function serveDirectory() {
+    await serverReadyPromise;
+    const res = await fetch("http://localhost:4500/");
+    const page = await res.text();
+    assert(page.includes(".travis.yml"));
+    maybeCompleteTests();
+  });
+
+  test(async function serveFallback() {
+    await serverReadyPromise;
+    const res = await fetch("http://localhost:4500/badfile.txt");
+    assertEqual(res.status, 404);
+    maybeCompleteTests();
+  });
+}