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RSpec.describe Magick::Image, '#crop' do
it 'works' do
image = described_class.new(20, 20)
expect { image.crop }.to raise_error(ArgumentError)
expect { image.crop(0, 0) }.to raise_error(ArgumentError)
result = image.crop(0, 0, image.columns / 2, image.rows / 2)
expect(result).to be_instance_of(described_class)
expect(result).not_to be(image)
# 3-argument form
Magick::GravityType.values do |grav|
expect { image.crop(grav, image.columns / 2, image.rows / 2) }.not_to raise_error
end
expect { image.crop(2, image.columns / 2, image.rows / 2) }.to raise_error(TypeError)
expect { image.crop(Magick::NorthWestGravity, image.columns / 2, image.rows / 2, 2) }.to raise_error(TypeError)
# 4-argument form
expect { image.crop(0, 0, image.columns / 2, 'x') }.to raise_error(TypeError)
expect { image.crop(0, 0, 'x', image.rows / 2) }.to raise_error(TypeError)
expect { image.crop(0, 'x', image.columns / 2, image.rows / 2) }.to raise_error(TypeError)
expect { image.crop('x', 0, image.columns / 2, image.rows / 2) }.to raise_error(TypeError)
expect { image.crop(0, 0, image.columns / 2, image.rows / 2, 2) }.to raise_error(TypeError)
# 5-argument form
Magick::GravityType.values do |grav|
expect { image.crop(grav, 0, 0, image.columns / 2, image.rows / 2) }.not_to raise_error
end
expect { image.crop(Magick::NorthWestGravity, 0, 0, image.columns / 2, image.rows / 2, 2) }.to raise_error(ArgumentError)
end
end
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