Add specs for Projects::ApproversController

spec/controllers/projects/approvers_controller_spec.rb

+require 'rails_helper'
+
+describe Projects::ApproversController do
+  describe '#destroy' do
+    before do
+      # Allow redirect_back_or_default to work
+      request.env['HTTP_REFERER'] = '/'
+    end
+
+    context 'on a merge request' do
+      it 'authorizes create_merge_request' do
+        merge    = create(:merge_request)
+        project  = stub_project(merge.target_project)
+        approver = create(:approver, target: merge)
+
+        expect(controller).to receive(:authorize_create_merge_request!)
+
+        go(project, merge_request_id: merge.to_param, id: approver.id)
+      end
+
+      it 'destroys the provided approver' do
+        merge    = create(:merge_request)
+        project  = stub_project(merge.target_project)
+        approver = create(:approver, target: merge)
+
+        allow(controller).to receive(:authorize_create_merge_request!)
+
+        expect { go(project, merge_request_id: merge.to_param, id: approver.id) }.
+          to change { merge.reload.approvers.count }.by(-1)
+      end
+    end
+
+    context 'on a project' do
+      it 'authorizes admin_project' do
+        project  = stub_project
+        approver = create(:approver, target: project)
+
+        expect(controller).to receive(:authorize_admin_project!)
+
+        go(project, id: approver.id)
+      end
+
+      it 'destroys the provided approver' do
+        project  = stub_project
+        approver = create(:approver, target: project)
+
+        allow(controller).to receive(:authorize_admin_project!).and_return(true)
+
+        expect { go(project, id: approver.id) }.
+          to change { project.approvers.count }.by(-1)
+      end
+    end
+
+    def go(project, params = {})
+      delete :destroy, {
+        namespace_id: project.namespace.to_param,
+        project_id: project.to_param
+      }.merge(params)
+    end
+
+    def stub_project(project = build_stubbed(:empty_project))
+      project.tap do |p|
+        allow(controller).to receive(:project).and_return(p)
+      end
+    end
+  end
+end