Add ide feature spec for user commits changes

- Adds a nested file (which had [a regression][1])
- Removes a nested file
- Confirms new state by looking at repository blob
- Adds data-level to help with automatic file traversing

[1]: https://gitlab.com/gitlab-org/gitlab/issues/198486

app/assets/javascripts/vue_shared/components/file_row.vue

@@ -111,6 +111,7 @@ export default {
     v-else
     :class="fileClass"
     :title="textForTitle"
+    :data-level="level"
     class="file-row"
     role="button"
     @click="clickFile"

spec/features/ide/user_commits_changes_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'IDE user commits changes', :js do
+  include WebIdeSpecHelpers
+
+  let(:project) { create(:project, :public, :repository) }
+  let(:user) { project.owner }
+
+  before do
+    sign_in(user)
+
+    ide_visit(project)
+  end
+
+  it 'user updates nested files' do
+    content = <<~HEREDOC
+      Lorem ipsum
+      Dolar sit
+      Amit
+    HEREDOC
+
+    ide_create_new_file('foo/bar/lorem_ipsum.md', content: content)
+    ide_delete_file('foo/bar/.gitkeep')
+
+    ide_commit
+
+    expect(page).to have_content('All changes are committed')
+    expect(project.repository.blob_at('master', 'foo/bar/.gitkeep')).to be_nil
+    expect(project.repository.blob_at('master', 'foo/bar/lorem_ipsum.md').data).to eql(content)
+  end
+end

spec/support/helpers/features/web_ide_spec_helpers.rb

+# frozen_string_literal: true
+
+# These helpers help you interact within the Web IDE.
+#
+# Usage:
+#   describe "..." do
+#     include WebIdeSpecHelpers
+#     ...
+#
+#     ide_visit(project)
+#     ide_create_new_file('path/to/file.txt', content: 'Lorem ipsum')
+#     ide_commit
+#
+module WebIdeSpecHelpers
+  include ActionView::Helpers::JavaScriptHelper
+
+  def ide_visit(project)
+    visit project_path(project)
+
+    wait_for_requests
+
+    click_link('Web IDE')
+
+    wait_for_requests
+  end
+
+  def ide_tree_body
+    page.find('.ide-tree-body')
+  end
+
+  def ide_tree_actions
+    page.find('.ide-tree-actions')
+  end
+
+  def ide_file_row_open?(row)
+    row.matches_css?('.is-open')
+  end
+
+  # Creates a file in the IDE by expanding directories
+  # then using the dropdown next to the parent directory
+  #
+  # - Throws an error if the parent directory is not found
+  def ide_create_new_file(path, content: '')
+    parent_path = path.split('/')[0...-1].join('/')
+
+    container = ide_traverse_to_file(parent_path)
+
+    if container
+      click_file_action(container, 'New file')
+    else
+      ide_tree_actions.click_button('New file')
+    end
+
+    within '#ide-new-entry' do
+      find('input').fill_in(with: path)
+      click_button('Create file')
+    end
+
+    ide_set_editor_value(content)
+  end
+
+  # Deletes a file by traversing to `path`
+  # then clicking the 'Delete' action.
+  #
+  # - Throws an error if the file is not found
+  def ide_delete_file(path)
+    container = ide_traverse_to_file(path)
+
+    click_file_action(container, 'Delete')
+  end
+
+  # Opens parent directories until the file at `path`
+  # is exposed.
+  #
+  # - Returns a reference to the file row at `path`
+  # - Throws an error if the file is not found
+  def ide_traverse_to_file(path)
+    paths = path.split('/')
+    container = nil
+
+    paths.each_with_index do |path, index|
+      ide_open_file_row(container) if container
+      container = find_file_child(container, path, level: index)
+    end
+
+    container
+  end
+
+  def ide_open_file_row(row)
+    return if ide_file_row_open?(row)
+
+    row.click
+  end
+
+  def ide_set_editor_value(value)
+    editor = find('.monaco-editor')
+    uri = editor['data-uri']
+
+    execute_script("monaco.editor.getModel('#{uri}').setValue('#{escape_javascript(value)}')")
+  end
+
+  def ide_editor_value
+    editor = find('.monaco-editor')
+    uri = editor['data-uri']
+
+    evaluate_script("monaco.editor.getModel('#{uri}').getValue()")
+  end
+
+  def ide_commit
+    ide_switch_mode('commit')
+
+    commit_to_current_branch
+  end
+
+  def ide_switch_mode(mode)
+    find(".js-ide-#{mode}-mode").click
+  end
+
+  private
+
+  def file_row_container(row)
+    row ? row.find(:xpath, '..') : ide_tree_body
+  end
+
+  def find_file_child(row, name, level: nil)
+    container = file_row_container(row)
+    container.find(".file-row[data-level=\"#{level}\"]", text: name)
+  end
+
+  def click_file_action(row, text)
+    row.hover
+    dropdown = row.find('.ide-new-btn')
+    dropdown.find('button').click
+    dropdown.find('button', text: text).click
+  end
+
+  def commit_to_current_branch(option: 'Commit to master branch', message: '')
+    within '.multi-file-commit-form' do
+      fill_in('commit-message', with: message) if message
+
+      choose(option)
+
+      click_button('Commit')
+
+      wait_for_requests
+    end
+  end
+end