Move custom matchers to their own files under spec/support/matchers

spec/support/matchers/include_module.rb

@@ -11,13 +11,3 @@ RSpec::Matchers.define :include_module do |expected|
     "expected #{described_class} to include the #{expected} module"
   end
 end
-
-# Extend shoulda-matchers
-module Shoulda::Matchers::ActiveModel
-  class ValidateLengthOfMatcher
-    # Shortcut for is_at_least and is_at_most
-    def is_within(range)
-      is_at_least(range.min) && is_at_most(range.max)
-    end
-  end
-end

spec/support/matchers/is_within.rb

@@ -0,0 +1,9 @@
+# Extend shoulda-matchers
+module Shoulda::Matchers::ActiveModel
+  class ValidateLengthOfMatcher
+    # Shortcut for is_at_least and is_at_most
+    def is_within(range)
+      is_at_least(range.min) && is_at_most(range.max)
+    end
+  end
+end