Added a failing test case for #67.

Author: harawata

src/test/java/org/apache/ibatis/submitted/foreach/ForEachTest.java

@@ -70,4 +70,22 @@ public void shouldGetAUser() {
     }
   }
 
+  @Test
+  public void shouldHandleComplexNullItem() {
+    SqlSession sqlSession = sqlSessionFactory.openSession();
+    try {
+      Mapper mapper = sqlSession.getMapper(Mapper.class);
+      User user1 = new User();
+      user1.setId(2);
+      user1.setName("User2");
+      List<User> users = new ArrayList<User>();
+      users.add(user1);
+      users.add(null);
+      int count = mapper.countByUserList(users);
+      Assert.assertEquals(1, count);
+    } finally {
+      sqlSession.close();
+    }
+  }
+
 }

src/test/java/org/apache/ibatis/submitted/foreach/Mapper.java

@@ -15,8 +15,12 @@
  */
 package org.apache.ibatis.submitted.foreach;
 
+import java.util.List;
+
 public interface Mapper {
 
   User getUser(User user);
 
+  int countByUserList(List<User> users);
+
 }

src/test/java/org/apache/ibatis/submitted/foreach/Mapper.xml

@@ -30,4 +30,14 @@
         )
 	</select>
 
+  <select id="countByUserList" resultType="_int" parameterType="list">
+    select count(*) from users
+      <where>
+        id in
+        <foreach item="item" collection="list" separator="," open="(" close=")">
+          #{item.id, jdbcType=NUMERIC}
+        </foreach>
+      </where>
+  </select>
+
 </mapper>