image_sorcery_examples_spec.rb

require 'fileutils'
require 'image_sorcery'

shared_examples_for Sorcery do |new_instance_method|
  subject(:image) do
    FileUtils.copy "./spec/fixtures/dog.jpeg", "./spec/fixtures/dog-2.jpeg"
    Sorcery.send(new_instance_method, "./spec/fixtures/dog-2.jpeg") # Who doesn't love dogs?
  end

  describe "getting the dimensions of an image" do
    it "returns a hash of dimensions" do
      image.dimensions.should == {:x => 160, :y => 120}
    end
  end

  describe "manipulating an image" do
    it "resizes an image" do
      original_dimensions = image.dimensions
      image.manipulate!(:resize => "50%")
      image.dimensions.map {|k,v| v.to_i}.should == original_dimensions.map {|k,v| v.to_i/2}
    end

    it "exposes width and height as integers" do
      image.width.should == 160
      image.height.should == 120
    end

    its(:filename_changed?) { should be_false }

    its(:file) { should eq "./spec/fixtures/dog-2.jpeg" }

    describe "change of format" do
      before :each do
        image.manipulate!(:format => "png")
      end

      describe "with image" do
        it "should delete original file" do
          File.exists?("./spec/fixtures/dog-2.jpeg").should be_false
        end

        it "should create file with new extension" do
          File.exists?("./spec/fixtures/dog-2.png").should be_true
        end

        its(:identify) { should include "PNG 160x120" }

        its(:filename_changed?) { should be_true }

        its(:file) { should eq "./spec/fixtures/dog-2.png" }
      end

      describe "with multi page pdf" do
        subject :image do
          FileUtils.copy "./spec/fixtures/pdf-sample.pdf", "./spec/fixtures/pdf-sample-2.pdf"
          Sorcery.send(new_instance_method, "./spec/fixtures/pdf-sample-2.pdf")
        end

        it "should delete original file" do
          File.exists?("./spec/fixtures/pdf-sample-2.pdf").should be_false
        end

        it "should create file with new extension" do

          case new_instance_method
            when "new"
              File.exists?("./spec/fixtures/pdf-sample-2-0.png").should be_true
              File.exists?("./spec/fixtures/pdf-sample-2-1.png").should be_true
            when "gm"
              File.exists?("./spec/fixtures/pdf-sample-2.png").should be_true
          end
        end

        its(:identify) { should include "PNG 595x842" }

        its(:filename_changed?) { should be_true }

        its(:file) { should eq "./spec/fixtures/pdf-sample-2.png" } if new_instance_method == "gm"
        its(:file) { should eq "./spec/fixtures/pdf-sample-2-*.png" } if new_instance_method == "new"
      end
    end
  end

  describe "converting an image" do
    it "writes the new image out to a file" do
      image.convert("new_image.png")
      File.exists?("new_image.png").should be_true
    end
  end

  describe "identifying an image" do
    it "returns a list of layers" do
      image.identify.should include "JPEG 160x120"
    end
  end

end