Making negative_captcha hashes predictable for tests.

lib/negative_captcha.rb

@@ -10,6 +10,11 @@ class NegativeCaptcha
     :timestamp,
     :error
 
+  TEST_MODE = false
+  def self.test_mode=(value)
+    const_set("TEST_MODE", value)
+  end
+
   def initialize(opts)
     self.secret = opts[:secret] ||
       Digest::MD5.hexdigest("this_is_a_secret_key")
@@ -30,7 +35,7 @@ def initialize(opts)
     MESSAGE
 
     self.fields = opts[:fields].inject({}) do |hash, field_name|
-      hash[field_name] = Digest::MD5.hexdigest(
+      hash[field_name] = TEST_MODE ? "test-#{field_name}" : Digest::MD5.hexdigest(
         [field_name, spinner, secret].join('-')
       )
 

negative_captcha.gemspec

@@ -1,7 +1,7 @@
 # -*- encoding: utf-8 -*-
 Gem::Specification.new do |s|
   s.name        = "negative_captcha"
-  s.version     = "0.3"
+  s.version     = "0.3.0"
   s.authors     = ["Erik Peterson"]
   s.email       = ["erik@subwindow.com"]
   s.homepage    = "http://github.com/subwindow/negative-captcha"

test/testable_negative_captcha_test.rb

@@ -0,0 +1,25 @@
+require 'rubygems'
+require 'active_support'
+require 'action_view'
+require 'test/unit'
+require File.expand_path(File.join(File.dirname(__FILE__), '../lib/negative-captcha'))
+
+class TestableNegativeCaptchaTest < Test::Unit::TestCase
+  def test_can_be_predictable_for_tests
+    NegativeCaptcha.test_mode = true
+    fields = [:name, :comment]
+
+    captcha = NegativeCaptcha.new(:fields => fields)
+    assert captcha.fields.is_a?(Hash)
+    assert_equal captcha.fields.keys.sort{|a,b|a.to_s<=>b.to_s}, fields.sort{|a,b|a.to_s<=>b.to_s}
+
+    filled_form = NegativeCaptcha.new(
+      :fields => fields,
+      :timestamp => captcha.timestamp,
+      :params => {:timestamp => captcha.timestamp, :spinner => captcha.spinner}.merge(captcha.fields.inject({}){|hash, name, encrypted_name| hash[encrypted_name] = name; hash})
+    )
+
+    assert_equal "", filled_form.error
+    assert filled_form.valid?
+  end
+end