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RSpec.describe Magick::Image, '#morphology_channel' do
it 'works' do
image = described_class.new(20, 20)
expect { image.morphology_channel }.to raise_error(ArgumentError)
expect { image.morphology_channel(Magick::RedChannel) }.to raise_error(ArgumentError)
expect { image.morphology_channel(Magick::RedChannel, Magick::EdgeOutMorphology) }.to raise_error(ArgumentError)
expect { image.morphology_channel(Magick::RedChannel, Magick::EdgeOutMorphology, 2) }.to raise_error(ArgumentError)
expect { image.morphology_channel(Magick::RedChannel, Magick::EdgeOutMorphology, 2, :not_kernel_info) }.to raise_error(ArgumentError)
kernel = Magick::KernelInfo.new('Octagon')
result = image.morphology_channel(Magick::RedChannel, Magick::EdgeOutMorphology, 2, kernel)
expect(result).to be_instance_of(described_class)
expect(result).not_to be(image)
end
end
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