Merge branch 'move-snippet-search-spinach-test-to-rspec' into 'master'

Move 'Search Snippets' Spinach feature to Rspec

## What does this MR do?
Moves the Spinach feature `features/snippet_search.feature` to an RSpec feature `spec/features/snippets/search_snippets_spec.rb`.

## Are there points in the code the reviewer needs to double check?

The search results page URL was being visited directly in the original Spinach test, using an encoded search query and specific parameters to trigger the snippet searches. I have changed the RSpect feature to fill in the search box on the snippets dashboard page to retrieve results to cover the missing test coverage on the search box and to avoid the feature test from relying on the implementation details of the search URL structure.

## Why was this MR needed?

As part of deprecating the Spinach test suite.

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [-] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [-] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [-] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

#23036

See merge request !7494

features/snippet_search.feature

-@dashboard
-Feature: Snippet Search
-  Background:
-    Given I sign in as a user
-    And I have public "Personal snippet one" snippet
-    And I have private "Personal snippet private" snippet
-    And I have a public many lined snippet
-
-  Scenario: I should see my public and private snippets
-    When I search for "snippet" in snippet titles
-    Then I should see "Personal snippet one" in results
-    And I should see "Personal snippet private" in results
-
-  Scenario: I should see three surrounding lines on either side of a matching snippet line
-    When I search for "line seven" in snippet contents
-    Then I should see "line four" in results
-    And I should see "line seven" in results
-    And I should see "line ten" in results
-    And I should not see "line three" in results
-    And I should not see "line eleven" in results

features/steps/shared/search.rb

-module SharedSearch
-  include Spinach::DSL
-
-  def search_snippet_contents(query)
-    visit "/search?search=#{URI::encode(query)}&snippets=true&scope=snippet_blobs"
-  end
-
-  def search_snippet_titles(query)
-    visit "/search?search=#{URI::encode(query)}&snippets=true&scope=snippet_titles"
-  end
-end

features/steps/snippet_search.rb

-class Spinach::Features::SnippetSearch < Spinach::FeatureSteps
-  include SharedAuthentication
-  include SharedPaths
-  include SharedSnippet
-  include SharedUser
-  include SharedSearch
-
-  step 'I search for "snippet" in snippet titles' do
-    search_snippet_titles 'snippet'
-  end
-
-  step 'I search for "snippet private" in snippet titles' do
-    search_snippet_titles 'snippet private'
-  end
-
-  step 'I search for "line seven" in snippet contents' do
-    search_snippet_contents 'line seven'
-  end
-
-  step 'I should see "line seven" in results' do
-    expect(page).to have_content 'line seven'
-  end
-
-  step 'I should see "line four" in results' do
-    expect(page).to have_content 'line four'
-  end
-
-  step 'I should see "line ten" in results' do
-    expect(page).to have_content 'line ten'
-  end
-
-  step 'I should not see "line eleven" in results' do
-    expect(page).not_to have_content 'line eleven'
-  end
-
-  step 'I should not see "line three" in results' do
-    expect(page).not_to have_content 'line three'
-  end
-
-  step 'I should see "Personal snippet one" in results' do
-    expect(page).to have_content 'Personal snippet one'
-  end
-
-  step 'I should see "Personal snippet private" in results' do
-    expect(page).to have_content 'Personal snippet private'
-  end
-
-  step 'I should not see "Personal snippet one" in results' do
-    expect(page).not_to have_content 'Personal snippet one'
-  end
-
-  step 'I should not see "Personal snippet private" in results' do
-    expect(page).not_to have_content 'Personal snippet private'
-  end
-end

spec/features/snippets/search_snippets_spec.rb

+require 'rails_helper'
+
+feature 'Search Snippets', feature: true do
+  scenario 'User searches for snippets by title' do
+    public_snippet = create(:personal_snippet, :public, title: 'Beginning and Middle')
+    private_snippet = create(:personal_snippet, :private, title: 'Middle and End')
+
+    login_as private_snippet.author
+    visit dashboard_snippets_path
+
+    page.within '.search' do
+      fill_in 'search', with: 'Middle'
+      click_button 'Go'
+    end
+
+    click_link 'Titles and Filenames'
+
+    expect(page).to have_link(public_snippet.title)
+    expect(page).to have_link(private_snippet.title)
+  end
+
+  scenario 'User searches for snippet contents' do
+    create(:personal_snippet,
+           :public,
+           title: 'Many lined snippet',
+           content: <<-CONTENT.strip_heredoc
+             |line one
+             |line two
+             |line three
+             |line four
+             |line five
+             |line six
+             |line seven
+             |line eight
+             |line nine
+             |line ten
+             |line eleven
+             |line twelve
+             |line thirteen
+             |line fourteen
+           CONTENT
+          )
+
+    login_as create(:user)
+    visit dashboard_snippets_path
+
+    page.within '.search' do
+      fill_in 'search', with: 'line seven'
+      click_button 'Go'
+    end
+
+    expect(page).to have_content('line seven')
+
+    # 3 lines before the matched line should be visible
+    expect(page).to have_content('line six')
+    expect(page).to have_content('line five')
+    expect(page).to have_content('line four')
+    expect(page).not_to have_content('line three')
+
+    # 3 lines after the matched line should be visible
+    expect(page).to have_content('line eight')
+    expect(page).to have_content('line nine')
+    expect(page).to have_content('line ten')
+    expect(page).not_to have_content('line eleven')
+  end
+end