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RSpec.describe Magick::Image, '#modulate' do
it 'works' do
image = described_class.new(20, 20)
result = image.modulate
expect(result).to be_instance_of(described_class)
expect(result).not_to be(image)
expect { image.modulate(0.5) }.not_to raise_error
expect { image.modulate('50%') }.not_to raise_error
expect { image.modulate(0.5, 0.5) }.not_to raise_error
expect { image.modulate(0.5, '50%') }.not_to raise_error
expect { image.modulate(0.5, 0.5, 0.5) }.not_to raise_error
expect { image.modulate(0.5, -0.5, -0.5) }.not_to raise_error
expect { image.modulate(0.5, 0.5, '50%') }.not_to raise_error
expect { image.modulate(0.5, '-50%', '-50%') }.not_to raise_error
expect { image.modulate(-0.5) }.to raise_error(ArgumentError)
expect { image.modulate('-50%') }.to raise_error(ArgumentError)
expect { image.modulate(0.0, 0.5, 0.5) }.to raise_error(ArgumentError)
expect { image.modulate(0.5, 0.5, 0.5, 0.5) }.to raise_error(ArgumentError)
expect { image.modulate('x', 0.5, 0.5) }.to raise_error(ArgumentError)
expect { image.modulate(0.5, 'x', 0.5) }.to raise_error(ArgumentError)
expect { image.modulate(0.5, 0.5, 'x') }.to raise_error(ArgumentError)
end
end
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