Updated docs for the validate_format_of matcher

* Reflects correct default error message (:invalid)
* Also added extra tests for invalid formats

lib/shoulda/matchers/active_record/validate_format_of_matcher.rb

@@ -8,7 +8,7 @@ module Shoulda # :nodoc:
       # Options:
       # * <tt>with_message</tt> - value the test expects to find in
       #   <tt>errors.on(:attribute)</tt>. <tt>Regexp</tt> or <tt>String</tt>.
-      #   Defaults to the translation for <tt>:blank</tt>.
+      #   Defaults to the translation for <tt>:invalid</tt>.
       # * <tt>with(string to test against)</tt>
       # * <tt>not_with(string to test against)</tt>
       #

spec/shoulda/active_record/validate_format_of_matcher_spec.rb

@@ -15,14 +15,17 @@ describe Shoulda::Matchers::ActiveRecord::ValidateFormatOfMatcher do
     end
 
     it "should not be valid with alpha in zip" do
+      @model.should_not validate_format_of(:attr).with('1234a')
       @model.should validate_format_of(:attr).not_with('1234a')
     end
 
-    it "should not be valid with to few digits" do
+    it "should not be valid with too few digits" do
+      @model.should_not validate_format_of(:attr).with('1234')
       @model.should validate_format_of(:attr).not_with('1234')
     end
 
-    it "should not be valid with to many digits" do
+    it "should not be valid with too many digits" do
+      @model.should_not validate_format_of(:attr).with('123456')
       @model.should validate_format_of(:attr).not_with('123456')
     end