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RSpec.describe Magick::Image, "#colormap" do
it "works" do
image = described_class.new(20, 20)
# IndexError b/c image is DirectClass
expect { image.colormap(0) }.to raise_error(IndexError)
# Read PseudoClass image
pc_image = described_class.read(IMAGES_DIR + '/Button_0.gif') { |info| info.depth = 8 }.first
expect { pc_image.colormap(0) }.not_to raise_error
ncolors = pc_image.colors
expect { pc_image.colormap(ncolors + 1) }.to raise_error(IndexError)
expect { pc_image.colormap(-1) }.to raise_error(IndexError)
expect { pc_image.colormap(ncolors - 1) }.not_to raise_error
result = pc_image.colormap(0)
expect(result).to be_instance_of(String)
# test 'set' operation
old_color = pc_image.colormap(0)
result = pc_image.colormap(0, 'red')
expect(result).to eq(old_color)
result = pc_image.colormap(0)
expected = value_by_version(
"6.8": "#FF0000",
"6.9": "#FF0000FF",
"7.0": "#FF0000FF",
"7.1": "#FF0000FF"
)
expect(result).to eq(expected)
pixel = Magick::Pixel.new(Magick::QuantumRange)
expect { pc_image.colormap(0, pixel) }.not_to raise_error
expect { pc_image.colormap }.to raise_error(ArgumentError)
expect { pc_image.colormap(0, pixel, Magick::BlackChannel) }.to raise_error(ArgumentError)
expect { pc_image.colormap(0, [2]) }.to raise_error(TypeError)
pc_image.freeze
expect { pc_image.colormap(0, 'red') }.to raise_error(FrozenError)
end
end
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