bug fixed for mysql parser

src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlAlterTableAddIndex_0.java

@@ -15,9 +15,10 @@
  */
 package com.alibaba.druid.bvt.sql.mysql;
 
-import junit.framework.Assert;
 import junit.framework.TestCase;
 
+import org.junit.Assert;
+
 import com.alibaba.druid.sql.SQLUtils;
 import com.alibaba.druid.sql.ast.SQLStatement;
 import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;

src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlAlterTableDropIndex_1.java

@@ -15,9 +15,10 @@
  */
 package com.alibaba.druid.bvt.sql.mysql;
 
-import junit.framework.Assert;
 import junit.framework.TestCase;
 
+import org.junit.Assert;
+
 import com.alibaba.druid.sql.SQLUtils;
 import com.alibaba.druid.sql.ast.SQLStatement;
 import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;

src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlAlterTableDrop_Test.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.sql.mysql;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
+import com.alibaba.druid.sql.parser.Token;
+
+public class MySqlAlterTableDrop_Test extends TestCase {
+
+    public void test_alter_first() throws Exception {
+        String sql = "ALTER TABLE `rules` DROP `enabled`";
+        MySqlStatementParser parser = new MySqlStatementParser(sql);
+        SQLStatement stmt = parser.parseStatementList().get(0);
+        parser.match(Token.EOF);
+        String output = SQLUtils.toMySqlString(stmt);
+        Assert.assertEquals("ALTER TABLE `rules`" //
+                            + "\n\tDROP COLUMN `enabled`", output);
+    }
+
+}