Fix 'Unhandled promise rejection (rejection id: 1): ReferenceError: setTimeout is not defined' warning.

packages/babel-helper-transform-fixture-test-runner/src/index.js

@@ -20,6 +20,8 @@ const testContext = vm.createContext({
   ...helpers,
   assert: chai.assert,
   transform: babel.transform,
+  setTimeout: setTimeout,
+  setImmediate: setImmediate,
 });
 testContext.global = testContext;
 

packages/babel-plugin-transform-async-to-generator/test/fixtures/regression/4943/exec.js

@@ -8,12 +8,6 @@ async function foo({ a, b = mandatory("b") } = {}) {
   return Promise.resolve(b);
 }
 
-return (async () => {
-  assert.doesNotThrow(() => {
-    foo()
-      .then(() => {
-        throw new Error('should not occcur');
-      })
-      .catch(() => true);
-  });
-})();
+return foo().then(() => {
+  throw new Error('should not occcur');
+}, () => true);