Fix tests

lib/mini_magick/image.rb

@@ -298,7 +298,7 @@ def format(format, page = 0)
       @info.clear
 
       if @tempfile
-        new_tempfile = MiniMagick::Utilities.tempfile(format)
+        new_tempfile = MiniMagick::Utilities.tempfile(".#{format}")
         new_path = new_tempfile.path
       else
         new_path = path.sub(/\.\w+$/, ".#{format}")
@@ -375,7 +375,7 @@ def write(output_to)
             builder << output_to
           end
         else
-          FileUtils.cp path, output_to
+          FileUtils.copy_file path, output_to
         end
       else
         IO.copy_stream File.open(path, "rb"), output_to
@@ -395,7 +395,7 @@ def write(output_to)
     # @see http://www.imagemagick.org/script/composite.php
     #
     def composite(other_image, output_extension = 'jpg', mask = nil)
-      output_tempfile = MiniMagick::Utilities.tempfile(output_extension)
+      output_tempfile = MiniMagick::Utilities.tempfile(".#{output_extension}")
 
       MiniMagick::Tool::Composite.new do |composite|
         yield composite if block_given?

lib/mini_magick/utilities.rb

@@ -24,7 +24,7 @@ def which(cmd)
     end
 
     def tempfile(extension)
-      Tempfile.new(["mini_magick", ".#{extension}"]).tap do |tempfile|
+      Tempfile.new(["mini_magick", extension]).tap do |tempfile|
         tempfile.binmode
         yield tempfile if block_given?
         tempfile.close

spec/lib/mini_magick/shell_spec.rb

@@ -42,7 +42,7 @@
 
     it "timeouts afer a period of time" do
       allow(MiniMagick).to receive(:timeout).and_return(0.001)
-      expect { subject.execute(%W[identify]) }
+      expect { subject.execute(%W[identify -format %[EXIF:*] #{image_path(:exif)}]) }
         .to raise_error(Timeout::Error)
     end
 

spec/support/helpers.rb

@@ -27,7 +27,8 @@ def image_url
   end
 
   def random_path(basename = "")
-    Tempfile.open(basename).path
+    @tempfile = Tempfile.open(basename)
+    @tempfile.path
   end
 end