import java.io.*;


// -------------------------------------------------------------------------
/**
 *  This test case class contains all of the tests for the LineCounter.
 *
 *  @author  Stephen Edwards
 *  @version Feb 22, 2005
 */
public class LineCounterTest
    extends junit.framework.TestCase
{
    //~ Instance/static variables .............................................

    private LineCounter lineCounter;


    //~ Methods ...............................................................

    // ----------------------------------------------------------
    /**
     * Sets up the test fixture.
     * Called before every test case method.
     */
    protected void setUp()
    {
        lineCounter = new LineCounter();
    }


    // ----------------------------------------------------------
    /**
     * Test the line count on an empty line counter.
     */
    public void testEmptyLines()
    {
        assertEquals( 0, lineCounter.lines() );
    }


    // ----------------------------------------------------------
    /**
     * Test the character count on an empty line counter.
     */
    public void testEmptyChars()
    {
        assertEquals( 0, lineCounter.characters() );
    }


    // ----------------------------------------------------------
    /**
     * This helper method takes a string, creates a buffered reader that
     * can read from the string, and uses the test fixture's line counter to
     * count the lines/chars in the string using this buffered reader.
     * @param input the string to count
     */
    private void countString( String input )
    {
        try
        {
            BufferedReader in =
                new BufferedReader( new StringReader( input ) );
            lineCounter.count( in );
            in.close();
        }
        catch ( IOException e )
        {
            e.printStackTrace();
        }
    }


    // ----------------------------------------------------------
    /**
     * Count an empty input source.
     */
    public void testCountEmpty()
    {
        countString( "" );
        assertEquals( 0, lineCounter.lines() );
        assertEquals( 0, lineCounter.characters() );
    }


    // ----------------------------------------------------------
    /**
     * Count an input source containing a single character.
     */
    public void testCountA()
    {
        countString( "a" );
        assertEquals( 1, lineCounter.lines() );
        assertEquals( 1, lineCounter.characters() );
    }


    // ----------------------------------------------------------
    /**
     * Count an input source containing two lines, where the last line
     * does not end in a newline.
     */
    public void testCountTwoLines()
    {
        countString( "abc\nd" );
        assertEquals( 2, lineCounter.lines() );
        assertEquals( 4, lineCounter.characters() );
    }


    // ----------------------------------------------------------
    /**
     * Count an input source containing two lines, where the last line
     * does end in a newline.
     */
    public void testCount3()
    {
        countString( "abc\nd\n" );
        assertEquals( 2, lineCounter.lines() );
        assertEquals( 4, lineCounter.characters() );
    }


    // ----------------------------------------------------------
    /**
     * Count multiple input sources, and check for appropriate
     * accumulation of multiple counts.
     */
    public void testCount4()
    {
        countString( "abc\nd\n" );
        assertEquals( 2, lineCounter.lines() );
        assertEquals( 4, lineCounter.characters() );
        countString( "a" );
        assertEquals( 1, lineCounter.lines() );
        assertEquals( 1, lineCounter.characters() );
        countString( "" );
        assertEquals( 0, lineCounter.lines() );
        assertEquals( 0, lineCounter.characters() );
    }
}