/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.io.fs;

import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyLong;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.verifyNoMoreInteractions;
import static org.mockito.Mockito.when;

import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.StandardCharsets;
import org.junit.jupiter.api.Test;

class StoreFileChannelTest {
    @Test
    void shouldHandlePartialWrites() throws Exception {
        // Given
        FileChannel mockChannel = mock(FileChannel.class);
        when(mockChannel.write(any(ByteBuffer.class), anyLong())).thenReturn(4);

        ByteBuffer buffer = ByteBuffer.wrap("Hello, world!".getBytes(StandardCharsets.UTF_8));

        StoreFileChannel channel = new StoreFileChannel(mockChannel);

        // When
        channel.writeAll(buffer, 20);

        // Then
        verify(mockChannel).write(buffer, 20);
        verify(mockChannel).write(buffer, 24);
        verify(mockChannel).write(buffer, 28);
        verify(mockChannel).write(buffer, 32);
        verifyNoMoreInteractions(mockChannel);
    }
}
