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How to use test_it_should_be_a_singleton method of InstallerTestHelpers Package

Best Inspec_ruby code snippet using InstallerTestHelpers.test_it_should_be_a_singleton

installer_test.rb

Source:installer_test.rb

...52#-----------------------------------------------------------------------#53class PluginInstallerBasicTests < MiniTest::Test54  include InstallerTestHelpers55  # it's a singleton56  def test_it_should_be_a_singleton57    klass = Inspec::Plugin::V2::Installer58    assert_equal klass.instance, klass.instance, "Calling instance on the Installer should always return the same object"59    assert_kind_of Inspec::Plugin::V2::Installer, klass.instance, 'Calling instance on the INstaller should return the right class'60    assert_raises(NoMethodError, 'Installer should have a private constructor') { klass.new }61  end62  # it should know its gem path63  def test_it_should_know_its_gem_path_with_a_default_location64    ENV['HOME'] = File.join(@config_dir_path, 'fakehome')65    expected = File.join(ENV['HOME'], '.inspec', 'gems', @ruby_abi_version)66    assert_equal expected, @installer.gem_path67  end68  def test_it_should_know_its_gem_path_with_a_custom_config_dir_from_env69    ENV['INSPEC_CONFIG_DIR'] = File.join(@config_dir_path, 'empty')70    expected = File.join(ENV['INSPEC_CONFIG_DIR'], 'gems', @ruby_abi_version)...

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