Tidy up IssuesFinder specs

- Don't do setup in spec bodies.
- Don't `describe` a symbol.
- Don't use 'should'.

spec/finders/issues_finder_spec.rb

 require 'spec_helper'
 
 describe IssuesFinder do
-  let(:user) { create :user }
-  let(:user2) { create :user }
-  let(:project1) { create(:project) }
-  let(:project2) { create(:project) }
+  let(:user) { create(:user) }
+  let(:user2) { create(:user) }
+  let(:project1) { create(:empty_project) }
+  let(:project2) { create(:empty_project) }
   let(:milestone) { create(:milestone, project: project1) }
   let(:label) { create(:label, project: project2) }
   let(:issue1) { create(:issue, author: user, assignee: user, project: project1, milestone: milestone) }
@@ -16,101 +16,113 @@ describe IssuesFinder do
     project1.team << [user, :master]
     project2.team << [user, :developer]
     project2.team << [user2, :developer]
+
+    issue1
+    issue2
+    issue3
   end
 
-  describe :execute do
-    before :each do
-      issue1
-      issue2
-      issue3
-    end
+  describe '#execute' do
+    let(:search_user) { user }
+    let(:params) { {} }
+    let(:issues) { IssuesFinder.new(search_user, params.merge(scope: scope, state: 'opened')).execute }
 
     context 'scope: all' do
-      it 'should filter by all' do
-        params = { scope: "all", state: 'opened' }
-        issues = IssuesFinder.new(user, params).execute
-        expect(issues.size).to eq(3)
-      end
+      let(:scope) { 'all' }
 
-      it 'should filter by assignee id' do
-        params = { scope: "all", assignee_id: user.id, state: 'opened' }
-        issues = IssuesFinder.new(user, params).execute
-        expect(issues.size).to eq(2)
+      it 'returns all issues' do
+        expect(issues).to contain_exactly(issue1, issue2, issue3)
       end
 
-      it 'should filter by author id' do
-        params = { scope: "all", author_id: user2.id, state: 'opened' }
-        issues = IssuesFinder.new(user, params).execute
-        expect(issues).to eq([issue3])
+      context 'filtering by assignee ID' do
+        let(:params) { { assignee_id: user.id } }
+
+        it 'returns issues assigned to that user' do
+          expect(issues).to contain_exactly(issue1, issue2)
+        end
       end
 
-      it 'should filter by milestone id' do
-        params = { scope: "all", milestone_title: milestone.title, state: 'opened' }
-        issues = IssuesFinder.new(user, params).execute
-        expect(issues).to eq([issue1])
+      context 'filtering by author ID' do
+        let(:params) { { author_id: user2.id } }
+
+        it 'returns issues created by that user' do
+          expect(issues).to contain_exactly(issue3)
+        end
       end
 
-      it 'should filter by no milestone id' do
-        params = { scope: "all", milestone_title: Milestone::None.title, state: 'opened' }
-        issues = IssuesFinder.new(user, params).execute
-        expect(issues).to match_array([issue2, issue3])
+      context 'filtering by milestone' do
+        let(:params) { { milestone_title: milestone.title } }
+
+        it 'returns issues assigned to that milestone' do
+          expect(issues).to contain_exactly(issue1)
+        end
       end
 
-      it 'should filter by label name' do
-        params = { scope: "all", label_name: label.title, state: 'opened' }
-        issues = IssuesFinder.new(user, params).execute
-        expect(issues).to eq([issue2])
+      context 'filtering by no milestone' do
+        let(:params) { { milestone_title: Milestone::None.title } }
+
+        it 'returns issues with no milestone' do
+          expect(issues).to contain_exactly(issue2, issue3)
+        end
       end
 
-      it 'returns unique issues when filtering by multiple labels' do
-        label2 = create(:label, project: project2)
+      context 'filtering by label' do
+        let(:params) { { label_name: label.title } }
 
-        create(:label_link, label: label2, target: issue2)
+        it 'returns issues with that label' do
+          expect(issues).to contain_exactly(issue2)
+        end
+      end
 
-        params = {
-          scope:      'all',
-          label_name: [label.title, label2.title].join(','),
-          state:      'opened'
-        }
+      context 'filtering by multiple labels' do
+        let(:params) { { label_name: [label.title, label2.title].join(',') } }
+        let(:label2) { create(:label, project: project2) }
 
-        issues = IssuesFinder.new(user, params).execute
+        before { create(:label_link, label: label2, target: issue2) }
 
-        expect(issues).to eq([issue2])
+        it 'returns the unique issues with any of those labels' do
+          expect(issues).to contain_exactly(issue2)
+        end
       end
 
-      it 'should filter by no label name' do
-        params = { scope: "all", label_name: Label::None.title, state: 'opened' }
-        issues = IssuesFinder.new(user, params).execute
-        expect(issues).to match_array([issue1, issue3])
+      context 'filtering by no label' do
+        let(:params) { { label_name: Label::None.title } }
+
+        it 'returns issues with no labels' do
+          expect(issues).to contain_exactly(issue1, issue3)
+        end
       end
 
-      it 'should be empty for unauthorized user' do
-        params = { scope: "all", state: 'opened' }
-        issues = IssuesFinder.new(nil, params).execute
-        expect(issues.size).to be_zero
+      context 'when the user is unauthorized' do
+        let(:search_user) { nil }
+
+        it 'returns no results' do
+          expect(issues).to be_empty
+        end
       end
 
-      it 'should not include unauthorized issues' do
-        params = { scope: "all", state: 'opened' }
-        issues = IssuesFinder.new(user2, params).execute
-        expect(issues.size).to eq(2)
-        expect(issues).not_to include(issue1)
-        expect(issues).to include(issue2)
-        expect(issues).to include(issue3)
+      context 'when the user can see some, but not all, issues' do
+        let(:search_user) { user2 }
+
+        it 'returns only issues they can see' do
+          expect(issues).to contain_exactly(issue2, issue3)
+        end
       end
     end
 
     context 'personal scope' do
-      it 'should filter by assignee' do
-        params = { scope: "assigned-to-me", state: 'opened' }
-        issues = IssuesFinder.new(user, params).execute
-        expect(issues.size).to eq(2)
+      let(:scope) { 'assigned-to-me' }
+
+      it 'returns issue assigned to the user' do
+        expect(issues).to contain_exactly(issue1, issue2)
       end
 
-      it 'should filter by project' do
-        params = { scope: "assigned-to-me", state: 'opened', project_id: project1.id }
-        issues = IssuesFinder.new(user, params).execute
-        expect(issues.size).to eq(1)
+      context 'filtering by project' do
+        let(:params) { { project_id: project1.id } }
+
+        it 'returns issues assigned to the user in that project' do
+          expect(issues).to contain_exactly(issue1)
+        end
       end
     end
   end