```ruby
require 'minitest/spec'

class TestDotNet4Install < MiniTest::Chef::TestCase

  def test_dot_framework_was_installed
    dotnet4dir = File.join(ENV['WINDIR'], "Microsoft.Net\\Framework64\\v4.0.30319")
    assert Dir.exists?(dotnet4dir)
  end

end
```

Use single-quoted strings per extended foodcritic.
user
```ruby
require 'minitest/spec'

class TestDotNet4Install < MiniTest::Chef::TestCase

  def test_dot_framework_was_installed
    dotnet4dir = File.join(ENV['WINDIR'], 'Microsoft.Net\\Framework64\\v4.0.30319')
    assert Dir.exists?(dotnet4dir)
  end

end
```
assistant