Fix random failing test

Make sure we wait till page reloads after request was merged. Otherwise
we get request running which fails next test

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

features/project/merge_requests/accept.feature

@@ -8,10 +8,12 @@ Feature: Project Merge Requests Acceptance
     Given I am on the Merge Request detail page
     When I click on "Remove source branch" option
     And I click on Accept Merge Request
-    Then I should not see the Remove Source Branch button
+    Then I should see merge request merged
+    And I should not see the Remove Source Branch button
   @javascript
   Scenario: Accepting the Merge Request without removing the source branch
     Given I am on the Merge Request detail page
     When I click on Accept Merge Request
-    Then I should see the Remove Source Branch button
+    Then I should see merge request merged
+    And I should see the Remove Source Branch button

features/steps/project/merge_requests/acceptance.rb

@@ -32,4 +32,8 @@ class Spinach::Features::ProjectMergeRequestsAcceptance < Spinach::FeatureSteps
   step 'I am signed in as a developer of the project' do
     login_as(@user)
   end
+
+  step 'I should see merge request merged' do
+    expect(page).to have_content('The changes were merged into')
+  end
 end