```ruby
require_relative '../test_helper'
require 'tempfile'

# Tempfile test class
class TempfileTest < Minitest::Test
  include FakeFS

  def test_open_should_not_raise_error
    FakeFS do
      # nothing raised
      FileUtils.mkdir_p(Dir.tmpdir)
      Tempfile.open('test')
    end
  end
end
```

Add a test for Tempfile.create
user
```ruby
require_relative '../test_helper'
require 'tempfile'

# Tempfile test class
class TempfileTest < Minitest::Test
  include FakeFS

  def test_open_should_not_raise_error
    FakeFS do
      # nothing raised
      FileUtils.mkdir_p(Dir.tmpdir)
      Tempfile.open('test')
    end
  end

  def test_create_block
    FakeFS do
      # nothing raised
      FileUtils.mkdir_p(Dir.tmpdir)
      # Ruby 2.3 requires a basename
      Tempfile.create('') do |f|
        f.write('Hello World!')
        f.flush

        assert_equal(File.read(f.path), 'Hello World!')
      end
    end
  end
end
```
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