message: Reset context between test functions
diff: @@ -37,7 +37,7 @@ function promisifyLifeCycleFunction(originalFn, env) {
  // We make *all* functions async and run `done` right away if they
  // didn't return a promise.
  const asyncFn = function(done) {
  - const returnValue = fn.call(this);
  + const returnValue = fn.call({});
  if (isPromise(returnValue)) {
  returnValue.then(done, done.fail);
  @@ -67,7 +67,7 @@ function promisifyIt(originalFn, env) {
  }
  const asyncFn = function(done) {
  - const returnValue = fn.call(this);
  + const returnValue = fn.call({});
  if (isPromise(returnValue)) {
  returnValue.then(done, done.fail);
  