/*
 * 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
 *
 *   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 org.apache.maven.doxia.util;

import java.io.StringReader;

import org.apache.maven.doxia.parser.ParseException;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.fail;

/**
 * Unit test for {@link org.apache.maven.doxia.util.ByLineReaderSource}.
 *
 * @author Juan F. Codagnone
 * @since Nov 1, 2005
 */
class ByLineReaderSourceTest {

    /**
     * @throws ParseException on error
     */
    @Test
    final void use() throws Exception {
        ByLineReaderSource r = new ByLineReaderSource(new StringReader("1 \n2\n3"));
        assertEquals(-1, r.getLineNumber());
        assertEquals("", r.getName());

        assertEquals("1 ", r.getNextLine());
        assertEquals("2", r.getNextLine());
        r.ungetLine();
        assertEquals("2", r.getNextLine());
        r.ungetLine();
        try {
            r.ungetLine();
            fail();
        } catch (IllegalStateException e) {
            // ok;
        }
        assertEquals("2", r.getNextLine());
        assertEquals("3", r.getNextLine());
        assertNull(r.getNextLine());
    }
}
