[test_helper.rb] Add TestRepo.clone_at helper

Used to clone a repo (first arg) to a new directory (second arg).

`TestRepo#clone` is added as well to assit with this as well.

Author: NickLaMuro

test/test_helper.rb

@@ -180,6 +180,11 @@ def self.generate repo_path, file_struct, &block
       repo.generate(&block)
     end
 
+    def self.clone_at url, dir, &block
+      repo = new dir, []
+      repo.clone(url, &block)
+    end
+
     def initialize repo_path, file_struct
       @commit_count = 0
       @repo_path    = Pathname.new repo_path
@@ -197,6 +202,15 @@ def generate &block
       instance_eval(&block) if block_given?
     end
 
+    def clone url, &block
+      @repo        = Rugged::Repository.clone_at url, @repo_path.to_s
+      @index       = repo.index
+      @last_commit = repo.last_commit
+      # puts @repo.inspect
+
+      instance_eval(&block) if block_given?
+    end
+
     # Create a new branch (don't checkout)
     #
     #   $ git branch other_branch