src/test/java/org/apache/commons/csv/issues/JiraCsv253Test.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *
 *   https://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 org.apache.commons.csv.issues;

import static org.apache.commons.csv.CsvAssertions.assertValuesEquals;

import java.io.IOException;
import java.io.StringReader;
import java.util.Iterator;

import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVParser;
import org.apache.commons.csv.CSVRecord;
import org.apache.commons.csv.QuoteMode;
import org.junit.jupiter.api.Test;

/**
 * Setting QuoteMode:ALL_NON_NULL or NON_NUMERIC can distinguish between empty string columns and absent value columns.
 */
class JiraCsv253Test {

    @Test
    void testHandleAbsentValues() throws IOException {
        // @formatter:off
        final String source =
                "\"John\",,\"Doe\"\n" +
                ",\"AA\",123\n" +
                "\"John\",90,\n" +
                "\"\",,90";
        // @formatter:on
        final CSVFormat csvFormat = CSVFormat.DEFAULT.builder().setQuoteMode(QuoteMode.NON_NUMERIC).get();
        try (CSVParser parser = csvFormat.parse(new StringReader(source))) {
            final Iterator<CSVRecord> csvRecords = parser.iterator();
            assertValuesEquals(new String[] {"John", null, "Doe"}, csvRecords.next());
            assertValuesEquals(new String[] {null, "AA", "123"}, csvRecords.next());
            assertValuesEquals(new String[] {"John", "90", null}, csvRecords.next());
            assertValuesEquals(new String[] {"", null, "90"}, csvRecords.next());
        }
    }
}