Merge pull request #986 from hazendaz/tests

[todo] Add a note about code that seems to be incorrectly written

Author: hazendaz

src/main/java/org/mybatis/spring/SqlSessionFactoryBean.java

@@ -565,6 +565,7 @@ private <T> T[] appendArrays(T[] oldArrays, T[] newArrays, IntFunction<T[]> gene
   public void afterPropertiesSet() throws Exception {
     notNull(dataSource, "Property 'dataSource' is required");
     notNull(sqlSessionFactoryBuilder, "Property 'sqlSessionFactoryBuilder' is required");
+    // TODO Review this statement as it seems off!
     state((configuration == null && configLocation == null) || !(configuration != null && configLocation != null),
         "Property 'configuration' and 'configLocation' can not specified with together");