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RSpec.describe Magick::Image, "#changed?" do
it "returns true when a new image is instantiated" do
image = described_class.new(2, 2)
expect(image.changed?).to be(true)
end
it "returns false after an image is loaded from disk" do
image = described_class.read(FLOWER_HAT).first
expect(image.changed?).to be(false)
end
it "returns true when a pixel in the image was changed" do
image = described_class.read(FLOWER_HAT).first
image.import_pixels(0, 0, 1, 1, "RGB", [45, 98, 156])
expect(image.changed?).to be(true)
end
it "still returns true after it has been persisted" do
image = described_class.read(FLOWER_HAT).first
Dir.mktmpdir do |tmp|
image.import_pixels(0, 0, 1, 1, "RGB", [45, 98, 156])
image.write("#{tmp}/test_changed_predicate.jpg")
expect(image.changed?).to be(true)
end
end
end
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