Add explicit test for #latest_successful_build_for!

project.latest_successful_build_for! is being tested inside of `describe
explicit. In doing so some duplication was generated but not
`#latest_successful_build_for!` has full coverage unlike before.

Move `create_pipeline` & `create_build` as helper methods for this spec
to reduce duplication.

spec/models/project_spec.rb

@@ -1104,13 +1104,13 @@ describe Project do
 
   describe '#pipeline_for' do
     let(:project) { create(:project, :repository) }
-    let!(:pipeline) { create_pipeline }
+    let!(:pipeline) { create_pipeline(project) }
 
     shared_examples 'giving the correct pipeline' do
       it { is_expected.to eq(pipeline) }
 
       context 'return latest' do
-        let!(:pipeline2) { create_pipeline }
+        let!(:pipeline2) { create_pipeline(project) }
 
         it { is_expected.to eq(pipeline2) }
       end
@@ -1127,13 +1127,6 @@ describe Project do
 
       it_behaves_like 'giving the correct pipeline'
     end
-
-    def create_pipeline
-      create(:ci_pipeline,
-             project: project,
-             ref: 'master',
-             sha: project.commit('master').sha)
-    end
   end
 
   describe '#builds_enabled' do
@@ -1922,35 +1915,20 @@ describe Project do
   end
 
   describe '#latest_successful_build_for' do
-    def create_pipeline(status = 'success')
-      create(:ci_pipeline, project: project,
-                           sha: project.commit.sha,
-                           ref: project.default_branch,
-                           status: status)
-    end
-
-    def create_build(new_pipeline = pipeline, name = 'test')
-      create(:ci_build, :success, :artifacts,
-             pipeline: new_pipeline,
-             status: new_pipeline.status,
-             name: name)
-    end
-
     let(:project) { create(:project, :repository) }
-    let(:pipeline) { create_pipeline }
+    let(:pipeline) { create_pipeline(project) }
 
     context 'with many builds' do
       it 'gives the latest builds from latest pipeline' do
-        pipeline1 = create_pipeline
-        pipeline2 = create_pipeline
+        pipeline1 = create_pipeline(project)
+        pipeline2 = create_pipeline(project)
         create_build(pipeline1, 'test')
         create_build(pipeline1, 'test2')
         build1_p2 = create_build(pipeline2, 'test')
         create_build(pipeline2, 'test2')
 
-        single_build = project.latest_successful_build_for(build1_p2.name)
-
-        expect(single_build).to eq(build1_p2)
+        expect(project.latest_successful_build_for(build1_p2.name))
+          .to eq(build1_p2)
       end
     end
 
@@ -1959,31 +1937,79 @@ describe Project do
 
       context 'standalone pipeline' do
         it 'returns builds for ref for default_branch' do
-          single_build = project.latest_successful_build_for(build.name)
+          expect(project.latest_successful_build_for(build.name))
+            .to eq(build)
+        end
 
-          expect(single_build).to eq(build)
+        it 'returns empty relation if the build cannot be found' do
+          expect(project.latest_successful_build_for('TAIL'))
+            .to be_nil
         end
+      end
 
-        it 'returns empty relation if the build cannot be found for #latest_successful_build_for' do
-          builds = project.latest_successful_build_for('TAIL')
+      context 'with some pending pipeline' do
+        before do
+          create_build(create_pipeline(project, 'pending'))
+        end
 
-          expect(builds).to be_nil
+        it 'gives the latest build from latest pipeline' do
+          expect(project.latest_successful_build_for(build.name))
+            .to eq(build)
         end
+      end
+    end
+
+    context 'with pending pipeline' do
+      it 'returns empty relation' do
+        pipeline.update(status: 'pending')
+        pending_build = create_build(pipeline)
 
-        it 'returns exception if the build cannot be found for #latest_successful_build_for!' do
-          expect { project.latest_successful_build_for!(build.name, 'TAIL') }.to raise_error(ActiveRecord::RecordNotFound)
+        expect(project.latest_successful_build_for(pending_build.name)).to be_nil
+      end
+    end
+  end
+
+  describe '#latest_successful_build_for!' do
+    let(:project) { create(:project, :repository) }
+    let(:pipeline) { create_pipeline(project) }
+
+    context 'with many builds' do
+      it 'gives the latest builds from latest pipeline' do
+        pipeline1 = create_pipeline(project)
+        pipeline2 = create_pipeline(project)
+        create_build(pipeline1, 'test')
+        create_build(pipeline1, 'test2')
+        build1_p2 = create_build(pipeline2, 'test')
+        create_build(pipeline2, 'test2')
+
+        expect(project.latest_successful_build_for(build1_p2.name))
+          .to eq(build1_p2)
+      end
+    end
+
+    context 'with succeeded pipeline' do
+      let!(:build) { create_build }
+
+      context 'standalone pipeline' do
+        it 'returns builds for ref for default_branch' do
+          expect(project.latest_successful_build_for!(build.name))
+            .to eq(build)
+        end
+
+        it 'returns exception if the build cannot be found' do
+          expect { project.latest_successful_build_for!(build.name, 'TAIL') }
+            .to raise_error(ActiveRecord::RecordNotFound)
         end
       end
 
       context 'with some pending pipeline' do
         before do
-          create_build(create_pipeline('pending'))
+          create_build(create_pipeline(project, 'pending'))
         end
 
         it 'gives the latest build from latest pipeline' do
-          last_single_build = project.latest_successful_build_for(build.name)
-
-          expect(last_single_build).to eq(build)
+          expect(project.latest_successful_build_for!(build.name))
+            .to eq(build)
         end
       end
     end
@@ -1993,9 +2019,8 @@ describe Project do
         pipeline.update(status: 'pending')
         pending_build = create_build(pipeline)
 
-        expect(project.latest_successful_build_for(pending_build.name)).to be_nil
-
-        expect { project.latest_successful_build_for!(pending_build.name) }.to raise_error(ActiveRecord::RecordNotFound)
+        expect { project.latest_successful_build_for!(pending_build.name) }
+          .to raise_error(ActiveRecord::RecordNotFound)
       end
     end
   end
@@ -4365,4 +4390,18 @@ describe Project do
   def rugged_config
     rugged_repo(project.repository).config
   end
+
+  def create_pipeline(project, status = 'success')
+    create(:ci_pipeline, project: project,
+                         sha: project.commit.sha,
+                         ref: project.default_branch,
+                         status: status)
+  end
+
+  def create_build(new_pipeline = pipeline, name = 'test')
+    create(:ci_build, :success, :artifacts,
+           pipeline: new_pipeline,
+           status: new_pipeline.status,
+           name: name)
+  end
 end