feat(testing): add a fixture/file helper for rspec tests

middleman-core/spec/spec_helper.rb

@@ -12,6 +12,8 @@ RSpec.configure do |config|
   config.include Aruba::Api
 end
 
+require_relative 'support/given'
+
 # encoding: utf-8
 RSpec.configure do |config|
   config.filter_run :focus

middleman-core/spec/support/given.rb

@@ -0,0 +1,42 @@
+module Given
+  ROOT = File.expand_path( '../..', File.dirname( File.realpath(__FILE__) ) )
+  TMP  = File.join( ROOT, 'tmp' )
+
+  class << self
+
+    def fixture name
+      cleanup!
+
+      `rsync -av #{File.join( ROOT, 'fixtures', name )}/ #{TMP}/`
+      Dir.chdir TMP
+      ENV['MM_ROOT'] = TMP
+    end
+
+    def no_file name
+      FileUtils.rm name, force: true
+    end
+
+    def symlink source, destination
+      no_file destination
+      FileUtils.symlink File.expand_path(source),
+                        File.expand_path(destination),
+                        force: true
+    end
+
+    def file name, content
+      file_path = File.join( TMP, name )
+      FileUtils.mkdir_p( File.dirname(file_path) )
+      File.open( file_path, 'w' ) do |file|
+        file.write content
+      end
+    end
+
+    def cleanup!
+      Dir.chdir ROOT
+      if File.exist? TMP
+        `rm -rf #{TMP}`
+      end
+    end
+
+  end
+end