added test for EditsValidations model concern

Author: Oaphi

test/models/concerns/edits_validations_test.rb

@@ -0,0 +1,41 @@
+require 'test_helper'
+
+class EditsValidationsTest < ActiveSupport::TestCase
+  def setup
+    @klass = Class.new do
+      include ActiveModel::Validations
+      include EditsValidations
+
+      def self.name
+        'EditsValidationsTest' # otherwise, ActiveModel::Name will error out
+      end
+
+      def initialize(comment)
+        super()
+        @comment = comment
+      end
+
+      attr_accessor :comment
+    end
+  end
+
+  test 'max_edit_comment_length should correctly validate comment length' do
+    max_length = 5
+
+    SiteSetting['MaxEditCommentLength'] = max_length
+
+    ['a' * max_length, 'b' * (max_length + 1)].each do |comment|
+      instance = @klass.new(comment)
+
+      is_valid = instance.valid?
+
+      if comment.length <= max_length
+        assert is_valid
+        assert instance.errors.none?
+      else
+        assert_not is_valid
+        assert instance.errors[:base].any?
+      end
+    end
+  end
+end