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RSpec.describe Magick::Image, '#blue_shift' do
it 'returns a new Image' do
image = described_class.read(IMAGES_DIR + '/Button_0.gif').first
result = image.blue_shift
expect(result).to be_instance_of(described_class)
expect(result).not_to eq image
end
it 'accepts one argument' do
image = described_class.read(IMAGES_DIR + '/Button_0.gif').first
expect { image.blue_shift(2) }.not_to raise_error
expect { image.blue_shift(2, 3) }.to raise_error(ArgumentError)
end
it "works" do
image = described_class.read(IMAGES_DIR + '/Button_0.gif').first
expect(image.blue_shift).not_to be(image)
expect(image.blue_shift(2.0)).not_to be(image)
expect { image.blue_shift('x') }.to raise_error(TypeError)
expect { image.blue_shift(2, 2) }.to raise_error(ArgumentError)
end
end
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