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RSpec.describe Magick::Image, "#alpha?" do
it "works" do
image = described_class.new(20, 20)
expect { image.alpha? }.not_to raise_error
expect(image.alpha?).to be(false)
expect { image.alpha Magick::ActivateAlphaChannel }.not_to raise_error
expect(image.alpha?).to be(true)
expect { image.alpha Magick::DeactivateAlphaChannel }.not_to raise_error
expect(image.alpha?).to be(false)
expect { image.alpha Magick::OpaqueAlphaChannel }.not_to raise_error
expect { image.alpha Magick::SetAlphaChannel }.not_to raise_error
expect { image.alpha Magick::SetAlphaChannel, Magick::OpaqueAlphaChannel }.to raise_error(ArgumentError)
image.freeze
expect { image.alpha Magick::SetAlphaChannel }.to raise_error(FrozenError)
end
end
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