Replace project graphs spinach tests with RSpec analog

https://gitlab.com/gitlab-org/gitlab-ce/issues/23036

features/project/graph.feature

-Feature: Project Graph
-  Background:
-    Given I sign in as a user
-    And I own project "Shop"
-
-  @javascript
-  Scenario: I should see project graphs
-    When I visit project "Shop" graph page
-    Then page should have graphs
-
-  @javascript
-  Scenario: I should see project languages & commits graphs on commits graph url
-    When I visit project "Shop" commits graph page
-    Then page should have commits graphs
-    Then page should have languages graphs
-
-  @javascript
-  Scenario: I should see project ci graphs
-    Given project "Shop" has CI enabled
-    When I visit project "Shop" CI graph page
-    Then page should have CI graphs
-
-  @javascript
-  Scenario: I should see project languages & commits graphs on language graph url
-    When I visit project "Shop" languages graph page
-    Then page should have languages graphs
-    Then page should have commits graphs
-
-  @javascript
-  Scenario: I should see project languages & commits graphs on charts url
-    When I visit project "Shop" chart page
-    Then page should have languages graphs
-    Then page should have commits graphs

features/steps/project/graph.rb

-class Spinach::Features::ProjectGraph < Spinach::FeatureSteps
-  include SharedAuthentication
-  include SharedProject
-
-  step 'page should have graphs' do
-    expect(page).to have_selector ".stat-graph"
-  end
-
-  When 'I visit project "Shop" graph page' do
-    visit project_graph_path(project, "master")
-  end
-
-  step 'I visit project "Shop" commits graph page' do
-    visit commits_project_graph_path(project, "master")
-  end
-
-  step 'I visit project "Shop" languages graph page' do
-    visit languages_project_graph_path(project, "master")
-  end
-
-  step 'I visit project "Shop" chart page' do
-    visit charts_project_graph_path(project, "master")
-  end
-
-  step 'page should have languages graphs' do
-    expect(page).to have_content /Ruby 66.* %/
-    expect(page).to have_content /JavaScript 22.* %/
-  end
-
-  step 'page should have commits graphs' do
-    expect(page).to have_content "Commit statistics for master"
-    expect(page).to have_content "Commits per day of month"
-  end
-
-  step 'I visit project "Shop" CI graph page' do
-    visit ci_project_graph_path(project, 'master')
-  end
-
-  step 'page should have CI graphs' do
-    expect(page).to have_content 'Overall'
-    expect(page).to have_content 'Pipelines for last week'
-    expect(page).to have_content 'Pipelines for last month'
-    expect(page).to have_content 'Pipelines for last year'
-    expect(page).to have_content 'Commit duration in minutes for last 30 commits'
-  end
-
-  def project
-    @project ||= Project.find_by(name: "Shop")
-  end
-end

spec/features/projects/graph_spec.rb

+require 'spec_helper'
+
+describe 'Project Graph', :js do
+  let(:user) { create :user }
+  let(:project) { create(:project, :repository, namespace: user.namespace) }
+
+  before do
+    project.add_master(user)
+
+    sign_in(user)
+  end
+
+  shared_examples 'page should have commits graphs' do
+    it 'renders commits' do
+      expect(page).to have_content('Commit statistics for master')
+      expect(page).to have_content('Commits per day of month')
+    end
+  end
+
+  shared_examples 'page should have languages graphs' do
+    it 'renders languages' do
+      expect(page).to have_content(/Ruby 66.* %/)
+      expect(page).to have_content(/JavaScript 22.* %/)
+    end
+  end
+
+  it 'renders graphs' do
+    visit project_graph_path(project, 'master')
+
+    expect(page).to have_selector('.stat-graph', visible: false)
+  end
+
+  context 'commits graph' do
+    before do
+      visit commits_project_graph_path(project, 'master')
+    end
+
+    it_behaves_like 'page should have commits graphs'
+    it_behaves_like 'page should have languages graphs'
+  end
+
+  context 'languages graph' do
+    before do
+      visit languages_project_graph_path(project, 'master')
+    end
+
+    it_behaves_like 'page should have commits graphs'
+    it_behaves_like 'page should have languages graphs'
+  end
+
+  context 'charts graph' do
+    before do
+      visit charts_project_graph_path(project, 'master')
+    end
+
+    it_behaves_like 'page should have commits graphs'
+    it_behaves_like 'page should have languages graphs'
+  end
+
+  context 'when CI enabled' do
+    before do
+      project.enable_ci
+
+      visit ci_project_graph_path(project, 'master')
+    end
+
+    it 'renders CI graphs' do
+      expect(page).to have_content 'Overall'
+      expect(page).to have_content 'Pipelines for last week'
+      expect(page).to have_content 'Pipelines for last month'
+      expect(page).to have_content 'Pipelines for last year'
+      expect(page).to have_content 'Commit duration in minutes for last 30 commits'
+    end
+  end
+end