4 files changed, 106 insertions, 0 deletions
diff --git a/spec/fixtures/zip/.gitkeep b/spec/fixtures/zip/.gitkeep
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/spec/fixtures/zip/.gitkeep
diff --git a/spec/services/meta_zip_data_spec.rb b/spec/services/meta_zip_data_spec.rb
new file mode 100644
index 000000000..88e33514d
--- /dev/null
+++ b/spec/services/meta_zip_data_spec.rb
@@ -0,0 +1,24 @@
+# Convenience meta spec to debug potential bugs in zip support helpers
+# uncomment run and check files in `zip_fixtures_path`
+# RSpec.describe 'ZipData', type: [:zip, :meta] do
+
+#   let( :zip_file ){ zip_fixtures_path('xxx.zip') }
+
+#   before do
+#     clear_all_zip_fixtures!
+#   end
+
+#   context 'a simple file' do
+#     let( :zip_data ){ 
+#       make_zip "xxx.zip",
+#         'hello.txt' => 'hello',
+#         'subdir/too.txt' => 'in a subdir'
+#     }
+
+
+#     it 'check' do
+#       zip_data.write_to(zip_file)
+#     end
+#   end
+  
+# end
diff --git a/spec/support/zip_support.rb b/spec/support/zip_support.rb
new file mode 100644
index 000000000..2fa7755af
--- /dev/null
+++ b/spec/support/zip_support.rb
@@ -0,0 +1,32 @@
+module ZipSupport
+
+  module Helper extend self
+    MAX_LEVEL = 5
+    def remove_dir_tree path, level: 0
+      raise RuntimeError, "too many levels in tree, > #{MAX_LEVEL}" if level > MAX_LEVEL
+
+      Dir.glob(path) do | file |
+        if File.directory? file
+          remove_dir_tree(File.join(file, '*'), level: level.succ)
+          Dir.unlink(file)
+        else
+          File.unlink(file)
+        end
+      end
+    end
+  end
+
+  def zip_fixtures_path(file_name)
+    fixtures_path(File.join('zip', file_name))
+  end
+
+  def clear_all_zip_fixtures! relpath = '*'
+    raise ArgumentError, 'up dir not allowed (..)' if %r{\.\.} === relpath
+    Helper.remove_dir_tree zip_fixtures_path(relpath)
+  end
+end
+
+RSpec.configure do |conf|
+  conf.include ZipSupport, type: :zip
+end
+
diff --git a/spec/support/zip_support/create_zip_data.rb b/spec/support/zip_support/create_zip_data.rb
new file mode 100644
index 000000000..bce3cf52d
--- /dev/null
+++ b/spec/support/zip_support/create_zip_data.rb
@@ -0,0 +1,50 @@
+module ZipSupport
+  module CreateZipData
+
+    class ZipData < Struct.new(:name, :data) 
+      def write_to file
+        File.write(file, data)
+      end
+    end
+
+    class Implementation
+
+      attr_reader :zip
+
+      def initialize name
+        @zip = ZipData.new(name, '') 
+      end
+
+      def make_from names_to_content_map
+        os = Zip::OutputStream.write_buffer do | zio |
+          names_to_content_map.each do |name_content_pair|
+            p name_content_pair
+            zio.put_next_entry(name_content_pair.first)
+            zio.write(name_content_pair.last)
+          end
+        end
+        zip.data = os.string
+        zip
+      end
+
+
+      private
+
+      def add_entries for_output_stream
+        -> *args do
+          file_output_stream.put_next_entry(args.first)
+          file_output_stream.write args.second
+        end
+      end
+    end
+
+
+    def make_zip(name, names_to_content_map = {})
+      Implementation.new(name).make_from(names_to_content_map)
+    end
+  end
+end
+
+RSpec.configure do |conf|
+  conf.include ZipSupport::CreateZipData, type: :zip
+end