Refactor Issues::BulkUpdateService spec

- Create fewer Issue objects; 2 is as good as 5 for these cases. This
  gives us a nice little speed improvement.
- Don't `describe` Symbols.
- Simplify object creation.
- Lessen "mystery guest" antipattern

spec/factories/issues.rb

@@ -18,5 +18,15 @@ FactoryGirl.define do
 
     factory :closed_issue, traits: [:closed]
     factory :reopened_issue, traits: [:reopened]
+
+    factory :labeled_issue do
+      transient do
+        labels []
+      end
+
+      after(:create) do |issue, evaluator|
+        issue.update_attributes(labels: evaluator.labels)
+      end
+    end
   end
 end

spec/services/issues/bulk_update_service_spec.rb

 require 'spec_helper'
 
 describe Issues::BulkUpdateService, services: true do
-  let(:user) { create(:user) }
-  let(:project) { Projects::CreateService.new(user, namespace: user.namespace, name: 'test').execute }
+  let(:user)    { create(:user) }
+  let(:project) { create(:empty_project, namespace: user.namespace) }
 
-  let!(:result) { Issues::BulkUpdateService.new(project, user, params).execute }
+  def bulk_update(issues, extra_params = {})
+    bulk_update_params = extra_params
+      .reverse_merge(issues_ids: Array(issues).map(&:id).join(','))
 
-  describe :close_issue do
-    let(:issues) { create_list(:issue, 5, project: project) }
-    let(:params) do
-      {
-        state_event: 'close',
-        issues_ids: issues.map(&:id).join(',')
-      }
-    end
+    Issues::BulkUpdateService.new(project, user, bulk_update_params).execute
+  end
+
+  describe 'close issues' do
+    let(:issues) { create_list(:issue, 2, project: project) }
 
     it 'succeeds and returns the correct number of issues updated' do
+      result = bulk_update(issues, state_event: 'close')
+
       expect(result[:success]).to be_truthy
       expect(result[:count]).to eq(issues.count)
     end
 
     it 'closes all the issues passed' do
+      bulk_update(issues, state_event: 'close')
+
       expect(project.issues.opened).to be_empty
       expect(project.issues.closed).not_to be_empty
     end
   end
 
-  describe :reopen_issues do
-    let(:issues) { create_list(:closed_issue, 5, project: project) }
-    let(:params) do
-      {
-        state_event: 'reopen',
-        issues_ids: issues.map(&:id).join(',')
-      }
-    end
+  describe 'reopen issues' do
+    let(:issues) { create_list(:closed_issue, 2, project: project) }
 
     it 'succeeds and returns the correct number of issues updated' do
+      result = bulk_update(issues, state_event: 'reopen')
+
       expect(result[:success]).to be_truthy
       expect(result[:count]).to eq(issues.count)
     end
 
     it 'reopens all the issues passed' do
+      bulk_update(issues, state_event: 'reopen')
+
       expect(project.issues.closed).to be_empty
       expect(project.issues.opened).not_to be_empty
     end
   end
 
   describe 'updating assignee' do
-    let(:issue) do
-      create(:issue, project: project) { |issue| issue.update_attributes(assignee: user) }
-    end
-
-    let(:params) do
-      {
-        assignee_id: assignee_id,
-        issues_ids: issue.id.to_s
-      }
-    end
+    let(:issue) { create(:issue, project: project, assignee: user) }
 
     context 'when the new assignee ID is a valid user' do
-      let(:new_assignee) { create(:user) }
-      let(:assignee_id) { new_assignee.id }
-
       it 'succeeds' do
+        result = bulk_update(issue, assignee_id: create(:user).id)
+
         expect(result[:success]).to be_truthy
         expect(result[:count]).to eq(1)
       end
 
       it 'updates the assignee to the use ID passed' do
-        expect(issue.reload.assignee).to eq(new_assignee)
+        assignee = create(:user)
+
+        expect { bulk_update(issue, assignee_id: assignee.id) }
+          .to change { issue.reload.assignee }.from(user).to(assignee)
       end
     end
 
     context 'when the new assignee ID is -1' do
-      let(:assignee_id) { -1 }
-
       it 'unassigns the issues' do
-        expect(issue.reload.assignee).to be_nil
+        expect { bulk_update(issue, assignee_id: -1) }
+          .to change { issue.reload.assignee }.to(nil)
       end
     end
 
     context 'when the new assignee ID is not present' do
-      let(:assignee_id) { nil }
-
       it 'does not unassign' do
-        expect(issue.reload.assignee).to eq(user)
+        expect { bulk_update(issue, assignee_id: nil) }
+          .not_to change { issue.reload.assignee }
       end
     end
   end
 
   describe 'updating milestones' do
-    let(:issue) { create(:issue, project: project) }
+    let(:issue)     { create(:issue, project: project) }
     let(:milestone) { create(:milestone, project: project) }
 
-    let(:params) do
-      {
-        issues_ids: issue.id.to_s,
-        milestone_id: milestone.id
-      }
-    end
-
     it 'succeeds' do
+      result = bulk_update(issue, milestone_id: milestone.id)
+
       expect(result[:success]).to be_truthy
       expect(result[:count]).to eq(1)
     end
 
     it 'updates the issue milestone' do
-      expect(project.issues.first.milestone).to eq(milestone)
+      expect { bulk_update(issue, milestone_id: milestone.id) }
+        .to change { issue.reload.milestone }.from(nil).to(milestone)
     end
   end
 
   describe 'updating labels' do
     def create_issue_with_labels(labels)
-      create(:issue, project: project) { |issue| issue.update_attributes(labels: labels) }
+      create(:labeled_issue, project: project, labels: labels)
     end
 
     let(:bug) { create(:label, project: project) }
@@ -129,15 +117,18 @@ describe Issues::BulkUpdateService, services: true do
     let(:add_labels) { [] }
     let(:remove_labels) { [] }
 
-    let(:params) do
+    let(:bulk_update_params) do
       {
-        label_ids: labels.map(&:id),
-        add_label_ids: add_labels.map(&:id),
+        label_ids:        labels.map(&:id),
+        add_label_ids:    add_labels.map(&:id),
         remove_label_ids: remove_labels.map(&:id),
-        issues_ids: issues.map(&:id).join(',')
       }
     end
 
+    before do
+      bulk_update(issues, bulk_update_params)
+    end
+
     context 'when label_ids are passed' do
       let(:issues) { [issue_all_labels, issue_no_labels] }
       let(:labels) { [bug, regression] }
@@ -263,40 +254,28 @@ describe Issues::BulkUpdateService, services: true do
     end
   end
 
-  describe :subscribe_issues do
-    let(:issues) { create_list(:issue, 5, project: project) }
-    let(:params) do
-      {
-        subscription_event: 'subscribe',
-        issues_ids: issues.map(&:id).join(',')
-      }
-    end
+  describe 'subscribe to issues' do
+    let(:issues) { create_list(:issue, 2, project: project) }
 
     it 'subscribes the given user' do
-      issues.each do |issue|
-        expect(issue.subscribed?(user)).to be_truthy
-      end
-    end
-  end
+      bulk_update(issues, subscription_event: 'subscribe')
 
-  describe :unsubscribe_issues do
-    let(:issues) { create_list(:closed_issue, 5, project: project) }
-    let(:params) do
-      {
-        subscription_event: 'unsubscribe',
-        issues_ids: issues.map(&:id).join(',')
-      }
+      expect(issues).to all(be_subscribed(user))
     end
+  end
 
-    before do
-      issues.each do |issue|
+  describe 'unsubscribe from issues' do
+    let(:issues) do
+      create_list(:closed_issue, 2, project: project) do |issue|
         issue.subscriptions.create(user: user, subscribed: true)
       end
     end
 
     it 'unsubscribes the given user' do
+      bulk_update(issues, subscription_event: 'unsubscribe')
+
       issues.each do |issue|
-        expect(issue.subscribed?(user)).to be_falsey
+        expect(issue).not_to be_subscribed(user)
       end
     end
   end