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--warnings option (run with warnings enabled)

Use the --warnings option to run specs with warnings enabled.

Given a file named "example_spec.rb" with:

RSpec.describe do
it 'generates warning' do
$undefined
end
end

When I run rspec --warnings example_spec.rb

Then the output should contain "warning".

Given a file named "example_spec.rb" with:

def foo(**kwargs)
kwargs
end

RSpec.describe do
it "should warn about keyword arguments with 'rspec -w'" do
expect(foo({a: 1})).to eq({a: 1})
end
end

When I run rspec -w example_spec.rb

Then the output should contain "warning".

Given a file named "example_spec.rb" with:

RSpec.describe do
it 'generates warning' do
$undefined
end
end

When I run rspec example_spec.rb

Then the output should not contain "warning".