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RSpec.describe Magick::Image, "#channel_depth" do
it "returns the depth for the given channel" do
image = build_image
depth = image.channel_depth(Magick::RedChannel)
expect(depth).to eq(16)
end
it "returns the depth for all channels when no arguments are passed" do
image = build_image
depth = image.channel_depth
expect(depth).to eq(16)
end
it "raises an error when the wrong type of argument is passed" do
image = build_image
expect { image.channel_depth("test") }
.to raise_error(TypeError, "argument must be a ChannelType value (String given)")
end
end
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