public void testFilenameCreation() {

    assertEquals("45S004W.GETASSE30", _descriptor.createTileFilename(-45, -4));
    assertEquals("45S004E.GETASSE30", _descriptor.createTileFilename(-45, +4));
    assertEquals("45N004W.GETASSE30", _descriptor.createTileFilename(+45, -4));
    assertEquals("45N004E.GETASSE30", _descriptor.createTileFilename(+45, +4));

    assertEquals("05S045W.GETASSE30", _descriptor.createTileFilename(-5, -45));
    assertEquals("05S045E.GETASSE30", _descriptor.createTileFilename(-5, +45));
    assertEquals("05N045W.GETASSE30", _descriptor.createTileFilename(+5, -45));
    assertEquals("05N045E.GETASSE30", _descriptor.createTileFilename(+5, +45));

    assertEquals("90S180W.GETASSE30", _descriptor.createTileFilename(-90, -180));
    assertEquals("90S180E.GETASSE30", _descriptor.createTileFilename(-90, +180));
    assertEquals("90N180W.GETASSE30", _descriptor.createTileFilename(+90, -180));
    assertEquals("90N180E.GETASSE30", _descriptor.createTileFilename(+90, +180));
  }
 public void testConstantProperties() {
   assertEquals("GETASSE30", _descriptor.getName());
 }