adding test_helpers for plugin testing

lib/lolcommits/test_helpers/git_repo.rb

@@ -0,0 +1,44 @@
+module Lolcommits
+  module TestHelpers
+    module GitRepo
+      def repo
+        @repo ||= Git.open(repo_path)
+      end
+
+      def repo_path
+        '~/.lolcommits/sample-plugin-test-repo'
+      end
+
+      def repo_exists?
+        File.directory?(File.expand_path(repo_path, '.git'))
+      end
+
+      def last_commit
+        repo.log.first
+      end
+
+      def setup_repo
+        return if repo_exists?
+        `git init --quiet #{repo_path}`
+      end
+
+      def commit_repo_with_message(message = 'test message', file_name: 'test.txt', file_content: 'testing')
+        setup_repo unless repo_exists?
+        `echo '#{file_content}' >> #{repo_path}/#{file_name}`
+        `cd #{repo_path} && git add #{file_name}`
+        `cd #{repo_path} && git commit -m "#{message}"`
+      end
+
+      def in_repo
+        return unless repo_exists?
+        Dir.chdir(File.expand_path(repo_path)) do
+          yield
+        end
+      end
+
+      def teardown_repo
+        `rm -rf #{repo_path}`
+      end
+    end
+  end
+end