package jalview.util;

import static org.junit.Assert.assertTrue;

import java.util.Arrays;

import org.junit.Test;

public class StringUtilsTest
{

  @Test
  public void testInsertCharAt()
  {
    char[] c1 = "ABC".toCharArray();
    char[] expected = new char[]
    { 'A', 'B', 'C', 'w', 'w' };
    assertTrue(Arrays.equals(expected,
            StringUtils.insertCharAt(c1, 3, 2, 'w')));
    expected = new char[]
    { 'A', 'B', 'C', 'w', 'w' };
    assertTrue(Arrays.equals(expected,
            StringUtils.insertCharAt(c1, 4, 2, 'w')));
    assertTrue(Arrays.equals(expected,
            StringUtils.insertCharAt(c1, 5, 2, 'w')));
    assertTrue(Arrays.equals(expected,
            StringUtils.insertCharAt(c1, 6, 2, 'w')));
    assertTrue(Arrays.equals(expected,
            StringUtils.insertCharAt(c1, 7, 2, 'w')));
  }

  @Test
  public void testDeleteChars()
  {
    char[] c1 = "ABC".toCharArray();

    // delete second position
    assertTrue(Arrays.equals(new char[]
    { 'A', 'C' }, StringUtils.deleteChars(c1, 1, 2)));

    // delete positions 1 and 2
    assertTrue(Arrays.equals(new char[]
    { 'C' }, StringUtils.deleteChars(c1, 0, 2)));

    // delete positions 1-3
    assertTrue(Arrays.equals(new char[]
    {}, StringUtils.deleteChars(c1, 0, 3)));

    // delete position 3
    assertTrue(Arrays.equals(new char[]
    { 'A', 'B' }, StringUtils.deleteChars(c1, 2, 3)));

    // out of range deletion is ignore
    assertTrue(Arrays.equals(c1, StringUtils.deleteChars(c1, 3, 4)));
  }
}