Add support for pushing and viewing files

The MR below adds a test for the code owners feature. This adds the
part of those changes specific to CE - the ability to add and view
files in a project.

https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/7368

app/views/projects/tree/_tree_content.html.haml

 .tree-content-holder.js-tree-content{ 'data-logs-path': @logs_path }
   .table-holder
-    %table.table#tree-slider{ class: "table_#{@hex_path} tree-table" }
+    %table.table#tree-slider{ class: "table_#{@hex_path} tree-table qa-file-tree" }
       %thead
         %tr
           %th= s_('ProjectFileTree|Name')

qa/qa/factory/repository/push.rb

@@ -30,6 +30,14 @@ module QA
           @directory = dir
         end
+        def files=(files)
+          if !files.is_a?(Array) || files.empty?
+            raise ArgumentError, "Please provide an array of hashes e.g.: [{name: 'file1', content: 'foo'}]"
+          end
+
+          @files = files
+        end
+
         def fabricate!
           Git::Repository.perform do |repository|
             if ssh_key
@@ -63,6 +71,10 @@ module QA
               @directory.each_child do |f|
                 repository.add_file(f.basename, f.read) if f.file?
               end
+            elsif @files
+              @files.each do |f|
+                repository.add_file(f[:name], f[:content])
+              end
             else
               repository.add_file(file_name, file_content)
             end

qa/qa/page/project/show.rb

@@ -42,6 +42,10 @@ module QA
           element :web_ide_button
         end
+        view 'app/views/projects/tree/_tree_content.html.haml' do
+          element :file_tree
+        end
+
         def project_name
           find('.qa-project-name').text
         end
@@ -51,6 +55,12 @@ module QA
           click_element :new_file_option
         end
+        def go_to_file(filename)
+          within_element(:file_tree) do
+            click_on filename
+          end
+        end
+
         def switch_to_branch(branch_name)
           find_element(:branches_select).click

qa/spec/factory/repository/push_spec.rb

+# frozen_string_literal: true
+
+describe QA::Factory::Repository::Push do
+  describe '.files=' do
+    let(:files) do
+      [
+        {
+          name: 'file.txt',
+          content: 'foo'
+        }
+      ]
+    end
+
+    subject { described_class.new }
+
+    it 'raises an error if files is not an array' do
+      expect { subject.files = '' }.to raise_error(ArgumentError)
+    end
+
+    it 'raises an error if files is an empty array' do
+      expect { subject.files = '[]' }.to raise_error(ArgumentError)
+    end
+
+    it 'does not raise if files is an array' do
+      expect { subject.files = files }.not_to raise_error
+    end
+  end
+end