Image1.rb

#! /usr/local/bin/ruby -w

require 'RMagick'
require 'base64'
require 'test/unit'
require 'test/unit/ui/console/testrunner'

class Image1_UT < Test::Unit::TestCase

    def setup
        @img = Magick::Image.new(20, 20)
    end

    # Test [], []=, and #properties
    def test_properties
        assert_nothing_raised do
            @img['a'] = 'string1'
            @img['b'] = 'string2'
            @img['c'] = 'string3'
        end
        assert_equal('string1', @img['a'])
        assert_equal('string2', @img['b'])
        assert_equal('string3', @img['c'])
        assert_nil(@img['d'])
        assert_nothing_raised do
            props = @img.properties
            assert_equal(3, props.length)
            assert_equal('string1', props['a'])
            assert_equal('string2', props['b'])
            assert_equal('string3', props['c'])
        end

        known = {'a'=>'string1', 'b'=>'string2', 'c'=>'string3'}
        @img.properties do |name, value|
            assert(known.has_key?(name))
            assert_equal(known[name], value)
        end

        assert_raise(TypeError) do
            @img.freeze
            @img['d'] = 'string4'
        end
    end

    # test constitute and dispatch
    def test_constitute
        @img = Magick::Image.read(IMAGES_DIR+'/Button_0.gif')[0]
        assert_nothing_raised do
            pixels = @img.dispatch(0, 0, @img.columns, @img.rows, 'RGBA')
            res = Magick::Image.constitute(@img.columns, @img.rows, 'RGBA', pixels)
            # The constituted image is in MIFF format so we
            # can't compare it directly to the original image.
            assert_equal(@img.columns, res.columns)
            assert_equal(@img.rows, res.rows)
            assert_block { pixels.all? { |v| 0 <= v && v <= Magick::MaxRGB } }
        end

        pixels = @img.dispatch(0, 0, @img.columns, @img.rows, 'RGBA', true)
        assert_block { pixels.all? { |v| 0.0 <= v && v <= 1.0 } }

        # dispatch wants exactly 5 or exactly 6 arguments
        assert_raise(ArgumentError) { @img.dispatch }
        assert_raise(ArgumentError) { @img.dispatch(0) }
        assert_raise(ArgumentError) { @img.dispatch(0, 0) }
        assert_raise(ArgumentError) { @img.dispatch(0, 0, @img.columns) }
        assert_raise(ArgumentError) { @img.dispatch(0, 0, @img.columns, @img.rows) }
        assert_raise(ArgumentError) { @img.dispatch(0, 0, 20, 20, 'RGBA', false, false) }
    end

    # test from_blob and to_blob
    def test_from_blob
        img = Magick::Image.read(IMAGES_DIR+'/Button_0.gif').first
        blob = nil
        res = nil
        assert_nothing_raised { blob = img.to_blob }
        assert_instance_of(String, blob)
        assert_nothing_raised { res = Magick::Image.from_blob(blob) }
        assert_instance_of(Array, res)
        assert_instance_of(Magick::Image, res[0])
        assert_equal(img, res[0])
    end

    def test_ping
        res = Magick::Image.ping(IMAGES_DIR+'/Button_0.gif')
        assert_instance_of(Array, res)
        assert_instance_of(Magick::Image, res[0])
        assert_equal('GIF', res[0].format)
        assert_equal(127, res[0].columns)
        assert_equal(120, res[0].rows)
        assert_match(/Button_0.gif/, res[0].filename)
    end

    def test_read_inline
        img = Magick::Image.read(IMAGES_DIR+'/Button_0.gif').first
        blob = img.to_blob
        encoded = Base64.encode64(blob)
        res = Magick::Image.read_inline(encoded)
        assert_instance_of(Array, res)
        assert_instance_of(Magick::Image, res[0])
        assert_equal(img, res[0])
    end

    def test_spaceship
        img0 = Magick::Image.read(IMAGES_DIR+'/Button_0.gif').first
        img1 = Magick::Image.read(IMAGES_DIR+'/Button_1.gif').first
        sig0 = img0.signature
        sig1 = img1.signature
        # since <=> is based on the signature, the images should
        # have the same relationship to each other as their
        # signatures have to each other.
        assert_equal(sig0 <=> sig1, img0 <=> img1)
        assert_equal(sig1 <=> sig0, img1 <=> img0)
        assert_equal(img0, img0)
        assert_not_equal(img0, img1)
    end

    def test_adaptive_blur
        assert_nothing_raised do
            res = @img.adaptive_blur
            assert_instance_of(Magick::Image, res)
        end
        assert_nothing_raised { @img.adaptive_blur(2) }
        assert_nothing_raised { @img.adaptive_blur(3, 2) }
        assert_raise(ArgumentError) { @img.adaptive_blur(3, 2, 2) }
    end

    def test_adaptive_blur_channel
        assert_nothing_raised do
            res = @img.adaptive_blur_channel
            assert_instance_of(Magick::Image, res)
        end
        assert_nothing_raised { @img.adaptive_blur_channel(2) }
        assert_nothing_raised { @img.adaptive_blur_channel(3, 2) }
        assert_nothing_raised { @img.adaptive_blur_channel(3, 2, Magick::RedChannel) }
        assert_nothing_raised { @img.adaptive_blur_channel(3, 2, Magick::RedChannel, Magick::BlueChannel) }
        assert_raise(ArgumentError) { @img.adaptive_blur(3, 2, 2) }
    end

    def test_adaptive_resize
        assert_nothing_raised do
            res = @img.adaptive_resize(10,10)
            assert_instance_of(Magick::Image, res)
        end
        assert_nothing_raised { @img.adaptive_resize(2) }
        assert_raise(ArgumentError) { @img.adaptive_resize(10,10,10) }
        assert_raise(ArgumentError) { @img.adaptive_resize }
    end

    def test_adaptive_sharpen
        assert_nothing_raised do
            res = @img.adaptive_sharpen
            assert_instance_of(Magick::Image, res)
        end
        assert_nothing_raised { @img.adaptive_sharpen(2) }
        assert_nothing_raised { @img.adaptive_sharpen(3, 2) }
        assert_raise(ArgumentError) { @img.adaptive_sharpen(3, 2, 2) }
    end

    def test_adaptive_sharpen_channel
        assert_nothing_raised do
            res = @img.adaptive_sharpen_channel
            assert_instance_of(Magick::Image, res)
        end
        assert_nothing_raised { @img.adaptive_sharpen_channel(2) }
        assert_nothing_raised { @img.adaptive_sharpen_channel(3, 2) }
        assert_nothing_raised { @img.adaptive_sharpen_channel(3, 2, Magick::RedChannel) }
        assert_nothing_raised { @img.adaptive_sharpen_channel(3, 2, Magick::RedChannel, Magick::BlueChannel) }
        assert_raise(ArgumentError) { @img.adaptive_sharpen(3, 2, 2) }
    end

    def test_adaptive_threshold
        assert_nothing_raised do
            res = @img.adaptive_threshold
            assert_instance_of(Magick::Image, res)
        end
        assert_nothing_raised { @img.adaptive_threshold(2) }
        assert_nothing_raised { @img.adaptive_threshold(2,4) }
        assert_nothing_raised { @img.adaptive_threshold(2,4,1) }
        assert_raise(ArgumentError) { @img.adaptive_threshold(2,4,1,2) }
    end

    def test_add_noise
        assert_nothing_raised { @img.add_noise(Magick::UniformNoise) }
        assert_nothing_raised { @img.add_noise(Magick::GaussianNoise) }
        assert_nothing_raised { @img.add_noise(Magick::MultiplicativeGaussianNoise) }
        assert_nothing_raised { @img.add_noise(Magick::ImpulseNoise) }
        assert_nothing_raised { @img.add_noise(Magick::LaplacianNoise) }
        assert_nothing_raised { @img.add_noise(Magick::PoissonNoise) }
        assert_raise(TypeError) { @img.add_noise(0) }
    end

    def test_add_noise_channel
        assert_nothing_raised { @img.add_noise_channel(Magick::UniformNoise) }
        assert_nothing_raised { @img.add_noise_channel(Magick::UniformNoise, Magick::RedChannel) }
        assert_nothing_raised { @img.add_noise_channel(Magick::GaussianNoise, Magick::BlueChannel) }
        assert_nothing_raised { @img.add_noise_channel(Magick::ImpulseNoise, Magick::GreenChannel) }
        assert_nothing_raised { @img.add_noise_channel(Magick::LaplacianNoise, Magick::RedChannel, Magick::GreenChannel) }
        assert_nothing_raised { @img.add_noise_channel(Magick::PoissonNoise, Magick::RedChannel, Magick::GreenChannel, Magick::BlueChannel) }

        # Not a NoiseType
        assert_raise(TypeError) { @img.add_noise_channel(1) }
        # Not a ChannelType
        assert_raise(TypeError) { @img.add_noise_channel(Magick::UniformNoise, Magick::RedChannel, 1) }
        # Too few arguments
        assert_raise(ArgumentError) { @img.add_noise_channel }
    end

    def add_delete_profile
        img = Magick::Image.read("cmyk.jpg"),first
        assert_nothing_raised { img.add_profile("cmyk.icm") }
        assert_nothing_raised { img.add_profile("srgb.icm") }
        img.each_profile { |name, value| assert_equal("icc", name) }
        assert_nothing_raised { img.delete_profile("icc") }
    end

    def test_affine_matrix
        affine = Magick::AffineMatrix.new(1, Math::PI/6, Math::PI/6, 1, 0, 0)
        assert_nothing_raised { @img.affine_transform(affine) }
        assert_raise(TypeError) { @img.affine_transform(0) }
        res = @img.affine_transform(affine)
        assert_instance_of(Magick::Image,  res)
    end

    def test_auto_orient
        assert_nothing_raised do
            res = @img.auto_orient
            assert_instance_of(Magick::Image, res)
            assert_not_same(@img, res)
        end

        assert_nothing_raised do
            res = @img.auto_orient!
            # When not changed, returns nil
            assert_nil(res)
        end
    end

    def test_bilevel_channel
        assert_raise(ArgumentError) { @img.bilevel_channel }
        assert_nothing_raised { @img.bilevel_channel(100) }
        assert_nothing_raised { @img.bilevel_channel(100, Magick::RedChannel) }
        assert_nothing_raised { @img.bilevel_channel(100, Magick::RedChannel, Magick::BlueChannel, Magick::GreenChannel, Magick::OpacityChannel) }
        assert_nothing_raised { @img.bilevel_channel(100, Magick::CyanChannel, Magick::MagentaChannel, Magick::YellowChannel, Magick::BlackChannel) }
        assert_nothing_raised { @img.bilevel_channel(100, Magick::GrayChannel) }
        assert_nothing_raised { @img.bilevel_channel(100, Magick::AllChannels) }
        assert_raise(TypeError) { @img.bilevel_channel(100, 2) }
        res = @img.bilevel_channel(100)
        assert_instance_of(Magick::Image,  res)
    end

    def test_blur_channel
        assert_nothing_raised { @img.blur_channel }
        assert_nothing_raised { @img.blur_channel(1) }
        assert_nothing_raised { @img.blur_channel(1,2) }
        assert_nothing_raised { @img.blur_channel(1,2, Magick::RedChannel) }
        assert_nothing_raised { @img.blur_channel(1,2, Magick::RedChannel, Magick::BlueChannel, Magick::GreenChannel, Magick::OpacityChannel) }
        assert_nothing_raised { @img.blur_channel(1,2, Magick::CyanChannel, Magick::MagentaChannel, Magick::YellowChannel, Magick::BlackChannel) }
        assert_nothing_raised { @img.blur_channel(1,2, Magick::GrayChannel) }
        assert_nothing_raised { @img.blur_channel(1,2, Magick::AllChannels) }
        assert_raise(TypeError) { @img.blur_channel(1,2,2) }
        res = @img.blur_channel
        assert_instance_of(Magick::Image,  res)
    end

    def test_blur_image
        assert_nothing_raised { @img.blur_image }
        assert_nothing_raised { @img.blur_image(1) }
        assert_nothing_raised { @img.blur_image(1,2) }
        assert_raise(ArgumentError) { @img.blur_image(1,2,3) }
        res = @img.blur_image
        assert_instance_of(Magick::Image,  res)
    end

    def test_black_threshold
        assert_raise(ArgumentError) { @img.black_threshold }
        assert_nothing_raised { @img.black_threshold(50) }
        assert_nothing_raised { @img.black_threshold(50, 50) }
        assert_nothing_raised { @img.black_threshold(50, 50, 50) }
        assert_nothing_raised { @img.black_threshold(50, 50, 50, 50) }
        assert_raise(ArgumentError) { @img.black_threshold(50, 50, 50, 50, 50) }
        res = @img.black_threshold(50)
        assert_instance_of(Magick::Image,  res)
    end

    def test_border
        assert_nothing_raised { @img.border(2, 2, 'red') }
        assert_nothing_raised { @img.border!(2, 2, 'red') }
        res = @img.border(2,2, 'red')
        assert_instance_of(Magick::Image,  res)
        @img.freeze
        assert_raise(TypeError) { @img.border!(2,2, 'red') }
    end

    def test_change_geometry
        assert_raise(ArgumentError) { @img.change_geometry("sss") }
        assert_raise(LocalJumpError) { @img.change_geometry("100x100") }
        assert_nothing_raised do
            res = @img.change_geometry("100x100") { 1 }
            assert_equal(1, res)
        end
        assert_raise(ArgumentError) { @img.change_geometry([]) }
    end

    def test_changed?
#        assert_block { !@img.changed? }
#        @img.pixel_color(0,0,'red')
#        assert_block { @img.changed? }
    end

    def test_channel
        assert_nothing_raised { @img.channel(Magick::RedChannel) }
        assert_nothing_raised { @img.channel(Magick::BlueChannel) }
        assert_nothing_raised { @img.channel(Magick::GreenChannel) }
        assert_nothing_raised { @img.channel(Magick::OpacityChannel) }
        assert_nothing_raised { @img.channel(Magick::MagentaChannel) }
        assert_nothing_raised { @img.channel(Magick::CyanChannel) }
        assert_nothing_raised { @img.channel(Magick::YellowChannel) }
        assert_nothing_raised { @img.channel(Magick::BlackChannel) }
        assert_nothing_raised { @img.channel(Magick::GrayChannel) }
        assert_nothing_raised { @img.channel(Magick::AlphaChannel) }
        assert_nothing_raised { @img.channel(Magick::DefaultChannels) }
        assert_nothing_raised { @img.channel(Magick::HueChannel) }
        assert_nothing_raised { @img.channel(Magick::LuminosityChannel) }
        assert_nothing_raised { @img.channel(Magick::SaturationChannel) }
        assert_instance_of(Magick::Image, @img.channel(Magick::RedChannel))
        assert_raise(TypeError) { @img.channel(2) }
    end

    def test_channel_depth
        assert_nothing_raised { @img.channel_depth }
        assert_nothing_raised { @img.channel_depth(Magick::RedChannel) }
        assert_nothing_raised { @img.channel_depth(Magick::RedChannel, Magick::BlueChannel) }
        assert_nothing_raised { @img.channel_depth(Magick::GreenChannel, Magick::OpacityChannel) }
        assert_nothing_raised { @img.channel_depth(Magick::MagentaChannel, Magick::CyanChannel) }
        assert_nothing_raised { @img.channel_depth(Magick::CyanChannel, Magick::BlackChannel) }
        assert_nothing_raised { @img.channel_depth(Magick::GrayChannel) }
        assert_raise(TypeError) { @img.channel_depth(2) }
        assert_instance_of(Fixnum, @img.channel_depth(Magick::RedChannel))
    end

    def test_channel_extrema
        assert_nothing_raised do
            res = @img.channel_extrema
            assert_instance_of(Array, res)
            assert_equal(2, res.length)
            assert_instance_of(Fixnum, res[0])
            assert_instance_of(Fixnum, res[1])
        end
        assert_nothing_raised { @img.channel_extrema(Magick::RedChannel) }
        assert_nothing_raised { @img.channel_extrema(Magick::RedChannel, Magick::BlueChannel) }
        assert_nothing_raised { @img.channel_extrema(Magick::GreenChannel, Magick::OpacityChannel) }
        assert_nothing_raised { @img.channel_extrema(Magick::MagentaChannel, Magick::CyanChannel) }
        assert_nothing_raised { @img.channel_extrema(Magick::CyanChannel, Magick::BlackChannel) }
        assert_nothing_raised { @img.channel_extrema(Magick::GrayChannel) }
        assert_raise(TypeError) { @img.channel_extrema(2) }
    end

    def test_channel_mean
        assert_nothing_raised do
            res = @img.channel_mean
            assert_instance_of(Array, res)
            assert_equal(2, res.length)
            assert_instance_of(Float, res[0])
            assert_instance_of(Float, res[1])
        end
        assert_nothing_raised { @img.channel_mean(Magick::RedChannel) }
        assert_nothing_raised { @img.channel_mean(Magick::RedChannel, Magick::BlueChannel) }
        assert_nothing_raised { @img.channel_mean(Magick::GreenChannel, Magick::OpacityChannel) }
        assert_nothing_raised { @img.channel_mean(Magick::MagentaChannel, Magick::CyanChannel) }
        assert_nothing_raised { @img.channel_mean(Magick::CyanChannel, Magick::BlackChannel) }
        assert_nothing_raised { @img.channel_mean(Magick::GrayChannel) }
        assert_raise(TypeError) { @img.channel_mean(2) }
    end

    def test_charcoal
        assert_nothing_raised do
            res = @img.charcoal
            assert_instance_of(Magick::Image, res)
        end
        assert_nothing_raised { @img.charcoal(1.0) }
        assert_nothing_raised { @img.charcoal(1.0, 2.0) }
        assert_raise(ArgumentError) { @img.charcoal(1.0, 2.0, 3.0) }
    end

    def test_chop
        assert_nothing_raised do
            res = @img.chop(10, 10, 10, 10)
            assert_instance_of(Magick::Image, res)
        end
    end

    def test_clone
        assert_nothing_raised do
            res = @img.clone
            assert_instance_of(Magick::Image, res)
            assert_equal(res, @img)
        end
        res = @img.clone
        assert_equal(res.frozen?, @img.frozen?)
        @img.freeze
        res = @img.clone
        assert_equal(res.frozen?, @img.frozen?)
    end

    def test_color_fill_to_border
        assert_raise(ArgumentError) { @img.color_fill_to_border(-1, 1, 'red') }
        assert_raise(ArgumentError) { @img.color_fill_to_border(1, 100, 'red') }
        assert_nothing_raised do
            res = @img.color_fill_to_border(@img.columns/2, @img.rows/2, 'red')
            assert_instance_of(Magick::Image, res)
        end
        pixel = Magick::Pixel.new(Magick::MaxRGB)
        assert_nothing_raised { @img.color_fill_to_border(@img.columns/2, @img.rows/2, pixel) }
    end

    def test_color_floodfill
        assert_raise(ArgumentError) { @img.color_floodfill(-1, 1, 'red') }
        assert_raise(ArgumentError) { @img.color_floodfill(1, 100, 'red') }
        assert_nothing_raised do
            res = @img.color_floodfill(@img.columns/2, @img.rows/2, 'red')
            assert_instance_of(Magick::Image, res)
        end
        pixel = Magick::Pixel.new(Magick::MaxRGB)
        assert_nothing_raised { @img.color_floodfill(@img.columns/2, @img.rows/2, pixel) }
    end

    def test_color_histogram
        assert_nothing_raised do
            res = @img.color_histogram
            assert_instance_of(Hash, res)
        end
    end

    def test_colorize
        assert_nothing_raised do
            res = @img.colorize(0.25, 0.25, 0.25, 'red')
            assert_instance_of(Magick::Image, res)
        end
        assert_nothing_raised { @img.colorize(0.25, 0.25, 0.25, 0.25, 'red') }
        pixel = Magick::Pixel.new(Magick::MaxRGB)
        assert_nothing_raised { @img.colorize(0.25, 0.25, 0.25, pixel) }
        assert_nothing_raised { @img.colorize(0.25, 0.25, 0.25, 0.25, pixel) }
        assert_raise(ArgumentError) { @img.colorize }
        assert_raise(ArgumentError) { @img.colorize(0.25) }
        assert_raise(ArgumentError) { @img.colorize(0.25, 0.25) }
        assert_raise(ArgumentError) { @img.colorize(0.25, 0.25, 0.25) }
        assert_raise(ArgumentError) { @img.colorize(0.25, 0.25, 0.25, 'X') }
        # last argument must be a color name or pixel
        assert_raise(TypeError) { @img.colorize(0.25, 0.25, 0.25, 0.25) }
        assert_raise(ArgumentError) { @img.colorize(0.25, 0.25, 0.25, 0.25, 'X') }
        assert_raise(TypeError) { @img.colorize(0.25, 0.25, 0.25, 0.25, [2]) }
    end

    def test_colormap
        # IndexError b/c @img is DirectClass
        assert_raise(IndexError) { @img.colormap(0) }
        # Read PseudoClass image
        pc_img = Magick::Image.read(IMAGES_DIR+'/Button_0.gif').first
        assert_nothing_raised { pc_img.colormap(0) }
        ncolors = pc_img.colors
        assert_raise(IndexError) { pc_img.colormap(ncolors+1) }
        assert_raise(IndexError) { pc_img.colormap(-1) }
        assert_nothing_raised { pc_img.colormap(ncolors-1) }
        res = pc_img.colormap(0)
        assert_instance_of(String, res)

        #test 'set' operation
        assert_nothing_raised do
            old_color = pc_img.colormap(0)
            res = pc_img.colormap(0, 'red')
            assert_equal(old_color, res)
            res = pc_img.colormap(0)
            assert_equal('red', res)
        end
        pixel = Magick::Pixel.new(Magick::MaxRGB)
        assert_nothing_raised { pc_img.colormap(0, pixel) }
        assert_raise(TypeError) { pc_img.colormap(0, [2]) }
        pc_img.freeze
        assert_raise(TypeError) { pc_img.colormap(0, 'red') }
    end

    def test_color_point
        assert_nothing_raised do
            res = @img.color_point(0, 0, 'red')
            assert_instance_of(Magick::Image, res)
            assert_not_same(@img, res)
        end
        pixel = Magick::Pixel.new(Magick::MaxRGB)
        assert_nothing_raised { @img.color_point(0, 0, pixel) }
    end

    def test_color_reset!
        assert_nothing_raised do
            res = @img.color_reset!('red')
            assert_same(@img, res)
        end
        pixel = Magick::Pixel.new(Magick::MaxRGB)
        assert_nothing_raised { @img.color_reset!(pixel) }
        assert_raise(TypeError) { @img.color_reset!([2]) }
        assert_raise(ArgumentError)  { @img.color_reset!('x') }
        @img.freeze
        assert_raise(TypeError) { @img.color_reset!('red') }
    end

    def test_compare_channel
        img1 = Magick::Image.read(IMAGES_DIR+'/Button_0.gif').first
        img2 = Magick::Image.read(IMAGES_DIR+'/Button_1.gif').first
        assert_nothing_raised { img1.compare_channel(img2, Magick::MeanAbsoluteErrorMetric) }
        assert_nothing_raised { img1.compare_channel(img2, Magick::MeanSquaredErrorMetric) }
        assert_nothing_raised { img1.compare_channel(img2, Magick::PeakAbsoluteErrorMetric) }
        assert_nothing_raised { img1.compare_channel(img2, Magick::PeakSignalToNoiseRatioMetric) }
        assert_nothing_raised { img1.compare_channel(img2, Magick::RootMeanSquaredErrorMetric) }
        assert_raise(TypeError) { img1.compare_channel(img2, 2) }
        assert_raise(ArgumentError) { img1.compare_channel }

        ilist = Magick::ImageList.new
        ilist << img2
        assert_nothing_raised { img1.compare_channel(ilist, Magick::MeanAbsoluteErrorMetric) }

        assert_nothing_raised { img1.compare_channel(img2, Magick::MeanAbsoluteErrorMetric, Magick::RedChannel) }
        assert_nothing_raised { img1.compare_channel(img2, Magick::MeanAbsoluteErrorMetric, Magick::RedChannel, Magick::BlueChannel) }
        assert_raise(TypeError) { img1.compare_channel(img2, Magick::MeanAbsoluteErrorMetric, 2) }
        assert_raise(TypeError) { img1.compare_channel(img2, Magick::MeanAbsoluteErrorMetric, Magick::RedChannel, 2) }

        res = img1.compare_channel(img2, Magick::MeanAbsoluteErrorMetric)
        assert_instance_of(Array, res)
        assert_instance_of(Magick::Image, res[0])
        assert_instance_of(Float, res[1])
    end

    def test_composite
        img1 = Magick::Image.read(IMAGES_DIR+'/Button_0.gif').first
        img2 = Magick::Image.read(IMAGES_DIR+'/Button_1.gif').first

        assert_raise(ArgumentError) { img1.composite }
        assert_raise(ArgumentError) { img1.composite(img2) }
        assert_raise(ArgumentError) { img1.composite(img2, Magick::NorthWestGravity) }
        assert_raise(ArgumentError) { img1.composite(2) }
        assert_raise(ArgumentError) { img1.composite(img2, 2) }

        composite_ops = [
                Magick::UndefinedCompositeOp,
                Magick::NoCompositeOp,
                Magick::AddCompositeOp,
                Magick::AtopCompositeOp,
                Magick::BumpmapCompositeOp,
                Magick::ClearCompositeOp,
                Magick::ColorizeCompositeOp,
                Magick::CopyBlueCompositeOp,
                Magick::CopyCompositeOp,
                Magick::CopyGreenCompositeOp,
                Magick::CopyOpacityCompositeOp,
                Magick::CopyRedCompositeOp,
                Magick::CopyCyanCompositeOp,
                Magick::CopyMagentaCompositeOp,
                Magick::CopyYellowCompositeOp,
                Magick::CopyBlackCompositeOp,
                Magick::DarkenCompositeOp,
                Magick::DifferenceCompositeOp,
                Magick::DisplaceCompositeOp,
                Magick::DissolveCompositeOp,
                Magick::DstAtopCompositeOp,
                Magick::DstCompositeOp,
                Magick::DstInCompositeOp,
                Magick::DstOutCompositeOp,
                Magick::DstOverCompositeOp,
                Magick::HueCompositeOp,
                Magick::InCompositeOp,
                Magick::LightenCompositeOp,
                Magick::LuminizeCompositeOp,
                Magick::MinusCompositeOp,
                Magick::ModulateCompositeOp,
                Magick::MultiplyCompositeOp,
                Magick::OutCompositeOp,
                Magick::OverCompositeOp,
                Magick::OverlayCompositeOp,
                Magick::PlusCompositeOp,
                Magick::ReplaceCompositeOp,
                Magick::SaturateCompositeOp,
                Magick::ScreenCompositeOp,
                Magick::SrcAtopCompositeOp,
                Magick::SrcCompositeOp,
                Magick::SrcInCompositeOp,
                Magick::SrcOutCompositeOp,
                Magick::SrcOverCompositeOp,
                Magick::SubtractCompositeOp,
                Magick::ThresholdCompositeOp,
                Magick::XorCompositeOp,
                Magick::BlendCompositeOp,
                Magick::ColorBurnCompositeOp,
                Magick::ColorDodgeCompositeOp,
                Magick::ExclusionCompositeOp,
                Magick::HardLightCompositeOp,
                Magick::SoftLightCompositeOp]
        gravity = [
                Magick::NorthEastGravity,
                Magick::EastGravity,
                Magick::SouthWestGravity,
                Magick::SouthGravity,
                Magick::SouthEastGravity]

        # 4 argument form
        assert_nothing_raised { img1.composite(img2, 0, 0, Magick::OverCompositeOp) }
        # negative offsets are transformed to 0
        assert_nothing_raised { img1.composite(img2, -10, -10, Magick::OverCompositeOp) }
        # there's way too many CompositeOperators to test them all, so just try few representative ops
        composite_ops.each do |op|
            assert_nothing_raised { img1.composite(img2, 0, 0, op) }
        end
        res = img1.composite(img2, 0, 0, Magick::OverCompositeOp)
        assert_instance_of(Magick::Image, res)
        assert_raise(TypeError) { img1.composite(img2, 0, 0, 2) }

        # 3 argument form
        composite_ops.each do |op|
            gravity.each do |grav|
                assert_nothing_raised { img1.composite(img2, grav, op) }
            end
        end
        assert_raise(TypeError) { img1.composite(img2, 2, Magick::OverCompositeOp) }

        # 5-argument form
        composite_ops.each do |op|
            gravity.each do |grav|
                assert_nothing_raised { img1.composite(img2, grav, 0, 0, op) }
                end
        end
        assert_raise(TypeError) { img1.composite(img2, 0, 0, 2, Magick::OverCompositeOp) }
    end


end

if __FILE__ == $0
IMAGES_DIR = '../doc/ex/images'
FILES = Dir[IMAGES_DIR+'/Button_*.gif']
Test::Unit::UI::Console::TestRunner.run(Image1_UT)
end