zapo · July 30, 2014 14:11 · Jul 30, 2014
diff --git a/validations.rb b/validations.rb
@@ -0,0 +1,67 @@
+module Helpers
+  module Validations
+    private
+
+    def assert_valid_url url
+      assert_match URI::regexp(%w(http https)), url, "\"#{url}\" isn't a valid URL"
+    end
+
+    def assert_validated_presence object, attribute, success_val = "not blank", expected_msg = :blank
+      assert_validated object, attribute,
+        :success_val  => success_val,
+        :failing_val  => nil,
+        :expected_msg => expected_msg
+    end
+
+    def assert_validated_url object, attribute, expected_msg = :invalid_url
+      assert_validated object, attribute,
+        :failing_val  => "1234",
+        :success_val  => "http://www.google.ca",
+        :expected_msg => expected_msg
+    end
+
+    def assert_validated object, attribute, options = {}
+
+      failing_val  = options.fetch(:failing_val)
+      success_val  = options.fetch(:success_val)
+      expected_msg = options.fetch(:expected_msg)
+
+      attribute = attribute.to_sym
+
+      get_expected_msg = lambda { |msg|
+        case expected_msg
+        when Symbol
+          object.errors.generate_message(attribute, expected_msg)
+        when Proc
+          msg.call(object, attribute)
+        when String
+          #noop
+        else
+          raise ArgumentError, "Invalid expected_msg #{msg}"
+        end
+      }
+
+      expected_msg = get_expected_msg.call(expected_msg)
+
+      write_attribute(object, attribute, failing_val)
+
+      assert object.invalid?
+      assert_includes object.errors[attribute], expected_msg
+
+      write_attribute(object, attribute, success_val)
+
+      object.valid?
+
+      refute_includes object.errors[attribute], expected_msg
+    end
+
+    def read_attribute object, attribute
+      object.send(:"#{attribute}")
+    end
+
+    def write_attribute object, attribute, val
+      object.send(:"#{attribute}=", val)
+    end
+  end
+end
+