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# ensure methods detect destroyed images
RSpec.describe Magick::Image, '#destroy' do
it 'works' do
image = described_class.new(20, 20)
methods = described_class.instance_methods(false).sort
methods -= %i[__display__ destroy! destroyed? inspect cur_image marshal_load]
expect(image.destroyed?).to be(false)
image.destroy!
expect(image.destroyed?).to be(true)
expect { image.check_destroyed }.to raise_error(Magick::DestroyedImageError)
methods.each do |method|
arity = image.method(method).arity
method = method.to_s
if method == '[]='
expect { image['foo'] = 1 }.to raise_error(Magick::DestroyedImageError)
elsif method == 'difference'
other = described_class.new(20, 20)
expect { image.difference(other) }.to raise_error(Magick::DestroyedImageError)
elsif method == 'channel_entropy' && IM_VERSION < Gem::Version.new('6.9')
expect { image.channel_entropy }.to raise_error(NotImplementedError)
elsif method == 'get_iptc_dataset'
expect { image.get_iptc_dataset('x') }.to raise_error(Magick::DestroyedImageError)
elsif method == 'profile!'
expect { image.profile!('x', 'y') }.to raise_error(Magick::DestroyedImageError)
elsif /=\Z/.match?(method)
expect { image.public_send(method, 1) }.to raise_error(Magick::DestroyedImageError)
elsif arity.zero?
expect { image.public_send(method) }.to raise_error(Magick::DestroyedImageError)
elsif arity < 0
args = (1..-arity).to_a
expect { image.public_send(method, *args) }.to raise_error(Magick::DestroyedImageError)
elsif arity > 0
args = (1..arity).to_a
expect { image.public_send(method, *args) }.to raise_error(Magick::DestroyedImageError)
else
# Don't know how to test!
flunk("don't know how to test method #{method}")
end
end
end
end
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