```ruby
# ==============================================================================
# SPEC - STRING FOUNDATION - VERSION
# ==============================================================================
# frozen_string_literal: true
describe StringFoundation::VERSION do

  # ----------------------------------------------------------------------------
  # Version Definition
  # ----------------------------------------------------------------------------
  it 'should have a version number' do
    expect(StringFoundation::VERSION).not_to be nil
  end

end
```

Use a method "be_nil" instead of "be nil"
user
```ruby
# ==============================================================================
# SPEC - STRING FOUNDATION - VERSION
# ==============================================================================
# frozen_string_literal: true
describe StringFoundation::VERSION do

  # ----------------------------------------------------------------------------
  # Version Definition
  # ----------------------------------------------------------------------------
  it 'should have a version number' do
    expect(StringFoundation::VERSION).not_to be_nil
  end

end
```
assistant