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RSpec.describe Magick::Image, "#black_threshold" do
it "works" do
image = described_class.new(20, 20)
expect { image.black_threshold }.to raise_error(ArgumentError)
expect { image.black_threshold(50) }.not_to raise_error
expect { image.black_threshold(50, 50) }.not_to raise_error
expect { image.black_threshold(50, 50, 50) }.not_to raise_error
expect { image.black_threshold(50, 50, 50, 50) }.to raise_error(ArgumentError)
expect { image.black_threshold(50, 50, 50, alpha: 50) }.not_to raise_error
expect { image.black_threshold(50, 50, 50, wrong: 50) }.to raise_error(ArgumentError)
expect { image.black_threshold(50, 50, 50, alpha: 50, extra: 50) }.to raise_error(ArgumentError)
expect { image.black_threshold(50, 50, 50, 50, 50) }.to raise_error(ArgumentError)
result = image.black_threshold(50)
expect(result).to be_instance_of(described_class)
end
end
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