Stop using MiniMagick::Image#run_command

lib/carrierwave/processing/mini_magick.rb

@@ -291,7 +291,7 @@ def manipulate!
       image = yield(image)
       FileUtils.mv image.path, current_path
 
-      image.run_command("identify", current_path)
+      ::MiniMagick::Image.new(current_path).identify
     rescue ::MiniMagick::Error, ::MiniMagick::Invalid => e
       raise e if e.message =~ /(You must have .+ installed|is not installed|executable not found)/
       message = I18n.translate(:"errors.messages.processing_error")

spec/processing/mini_magick_spec.rb

@@ -300,6 +300,14 @@
       expect(instance).to be_format('png')
     end
 
+    it "returns the result of #identify on the manipulated image" do
+      expect(
+        instance.manipulate! do |image|
+          image.format('png')
+        end
+      ).to include 'landscape_copy.jpg PNG 640x480'
+    end
+
     context "on failing to find ImageMagick/GraphicsMagick" do
       before do
         MiniMagick.remove_instance_variable(:@processor) if MiniMagick.instance_variable_defined?(:@processor)

spec/spec_helper.rb

@@ -113,8 +113,12 @@ def change_and_enforce_available_locales(locale, available_locales, &block)
 
     module ManipulationHelpers
       def color_of_pixel(path, x, y)
-        image = ::MiniMagick::Image.open(path)
-        image.run_command("convert", "#{image.path}[1x1+#{x}+#{y}]", "-depth", "8", "txt:").split("\n")[1]
+        convert = ::MiniMagick::Tool::Convert.new
+        convert << path
+        convert.crop("1x1+#{x}+#{y}")
+        convert.depth(8)
+        convert << "txt:"
+        convert.call.split("\n")[1]
       end
     end