Add repository spec to copy simulated git repository

.rspec

@@ -1,2 +1,3 @@
 --color
 --require spec_helper
+--tag ~repository

.rubocop.yml

@@ -8,6 +8,7 @@ AllCops:
   Exclude:
     - examples/**/*
     - vendor/**/*
+    - tmp/**/*
 
 Layout/LineLength:
   Enabled: false

README.md

@@ -68,6 +68,15 @@ The `evaluate` command analyzes the given microservices architecture, and evalua
 ```bash
 $ mosaik evaluate --help
 ```
+## Development and Testing
+
+Some test make use of a simulated git repository. If you want to use this repository for development, run the following command:
+
+```bash
+$ rspec spec/mosaik/repository_spec.rb --tag repository
+```
+
+The simulated git repository will be copied to `tmp/repository` and can be used for development.
 
 ## Releasing
 

spec/mosaik/repository_spec.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+RSpec.describe "Repository", :repository do
+  include_context "with a git repository"
+
+  it "copies the simulated git repository" do
+    FileUtils.mkdir_p MOSAIK.root.join("tmp/repository")
+
+    expect { FileUtils.cp_r File.join(directory, "."), MOSAIK.root.join("tmp/repository") }.not_to raise_error
+  end
+end