move test helpers from demo app to tests/

tests/helpers.ts

@@ -0,0 +1,42 @@
+import { WEnv } from "../src/component";
+import { QWeb } from "../src/qweb_vdom";
+
+export function nextMicroTick(): Promise<void> {
+  return Promise.resolve();
+}
+
+export function nextTick(): Promise<void> {
+  return new Promise(resolve => setTimeout(resolve));
+}
+
+export function makeTestFixture() {
+  let fixture = document.createElement("div");
+  document.body.appendChild(fixture);
+  return fixture;
+}
+
+export function normalize(str: string): string {
+  return str.replace(/\s+/g, "");
+}
+
+interface Deferred extends Promise<any> {
+  resolve(val?: any): void;
+  reject(): void;
+}
+
+export function makeDeferred(): Deferred {
+  let resolve, reject;
+  let def = new Promise((_resolve, _reject) => {
+    resolve = _resolve;
+    reject = _reject;
+  });
+  (<Deferred>def).resolve = resolve;
+  (<Deferred>def).reject = reject;
+  return <Deferred>def;
+}
+
+export function makeTestWEnv(): WEnv {
+  return {
+    qweb: new QWeb()
+  };
+}