diff --git a/spec/unit/mutant/mutator_spec.rb b/spec/unit/mutant/mutator_spec.rb
deleted file mode 100644
index 1346329c..00000000
--- a/spec/unit/mutant/mutator_spec.rb
+++ /dev/null
@@ -1,29 +0,0 @@
-# encoding: utf-8
-
-# This file is the sandbox for new mutations.
-# Once finished mutation test will be moved to class specfic
-# file.
-
-require 'spec_helper'
-
-describe Mutant::Mutator do
-  describe '.each' do
-
-    pending 'interpolated string literal (DynamicString)' do
-      let(:source) { '"foo#{1}bar"' }
-
-      let(:random_string) { 'this-is-random' }
-
-      let(:mutations) do
-        mutations = []
-        mutations << 'nil'
-      end
-
-      before do
-        Mutant::Random.stub(hex_string: random_string)
-      end
-
-      it_should_behave_like 'a mutator'
-    end
-  end
-end