Added tests for validators

test/validators/trailing_whitespace_validator_test.rb

@@ -0,0 +1,33 @@
+require "test_helper"
+
+class TrailingWhitespaceValidatable
+  include ActiveModel::Validations
+  validates :string, :trailing_whitespace => true
+  attr_accessor :string
+end
+
+class TrailingWhitespaceValidatorTest < ActiveSupport::TestCase
+  include Rails::Dom::Testing::Assertions::SelectorAssertions
+
+  def test_with_trailing_whitespace
+    validator = TrailingWhitespaceValidatable.new
+
+    strings = [" ", "test ", "  ", "test\t", "_test_ "]
+
+    strings.each do |v|
+      validator.string = v
+      assert_not validator.valid?, "'#{v}' should not be valid"
+    end
+  end
+
+  def test_without_trailing_whitespace
+    validator = TrailingWhitespaceValidatable.new
+
+    strings = ["test", " test", "tes t", "\ttest", "test.", "test_"]
+
+    strings.each do |v|
+      validator.string = v
+      assert validator.valid?, "'#{v}' should be valid"
+    end
+  end
+end