diff --git a/spec/sensitive_spec.rb b/spec/sensitive_spec.rb
deleted file mode 100644
index 00b28bd..0000000
--- a/spec/sensitive_spec.rb
+++ /dev/null
@@ -1,26 +0,0 @@
-require "minitest/autorun"
-
-$LOAD_PATH.unshift File.dirname(__FILE__) + "/../lib"
-
-require "sensitive"
-
-ALPHABET = ("a".."z").reduce(:concat)
-
-describe "Sensitive" do
-  before do
-    @s = Sensitive.new ALPHABET
-  end
-
-  it "test initialize" do
-    _(@s.to_s).must_equal "ab" + "*" * 22 + "yz"
-  end
-
-  it "test initialize" do
-    _(@s.unwrap).must_equal ALPHABET
-  end
-
-  it "test using different mask character" do
-    s = Sensitive.new ALPHABET, ch: "x"
-    _(s.to_s).must_equal "x"
-  end
-end