### Question:
DataxUtils { public static String[] convertKeywordsColumns(DbType dbType, String[] columns) { if (columns == null) { return null; } String[] toColumns = new String[columns.length]; for (int i = 0; i < columns.length; i++ ) { toColumns[i] = doConvertKeywordsColumn(dbType, columns[i]); } return toColumns; }  static String getReaderPluginName(DbType dbType); static String getWriterPluginName(DbType dbType); static SQLStatementParser getSqlStatementParser(DbType dbType, String sql); static String[] convertKeywordsColumns(DbType dbType, String[] columns); static String doConvertKeywordsColumn(DbType dbType, String column); static final String DATAX_READER_PLUGIN_MYSQL; static final String DATAX_READER_PLUGIN_POSTGRESQL; static final String DATAX_READER_PLUGIN_ORACLE; static final String DATAX_READER_PLUGIN_SQLSERVER; static final String DATAX_WRITER_PLUGIN_MYSQL; static final String DATAX_WRITER_PLUGIN_POSTGRESQL; static final String DATAX_WRITER_PLUGIN_ORACLE; static final String DATAX_WRITER_PLUGIN_SQLSERVER; }### Answer:
@Test public void testConvertKeywordsColumns() throws Exception { String[] fromColumns = new String[]{"`select`", "from", "\"where\"", " table "}; String[] targetColumns = new String[]{"`select`", "`from`", "`where`", "`table`"}; String[] toColumns = DataxUtils.convertKeywordsColumns(DbType.MYSQL, fromColumns); assertTrue(fromColumns.length == toColumns.length); for (int i = 0; i < toColumns.length; i++) { assertEquals(targetColumns[i], toColumns[i]); } }