// testing find
void testFind(Tester t) {
  this.initDeque();
  t.checkExpect(deque2.find(new StrLengthOver3), sentinel1);
  t.checkExpect(deque2.find(new StrLengthOver2), node1);
  t.checkExpect(deque3.find(new StrLengthOver3), node5);
}

// testing findSentHelp
void testFindSentHelp(Tester t) {
  this.initDeque();
  t.checkExpect(sentinel1.findSentHelp(new StrLengthOver3), sentinel1);
  t.checkExpect(sentinel1.findSentHelp(new StrLengthOver2), node1);
  t.checkExpect(sentinel2.findSentHelp(new StrLengthOver3), node5);
}

// testing findHelp
void testFindHelp(Tester t) {
  this.initDeque();
  t.checkExpect(sentinel1.findHelp(new StrLengthOver3), sentinel1);
  t.checkExpect(node1.findHelp(new StrLengthOver3), sentinel1);
  t.checkExpect(node1.findHelp(new StrLengthOver2), node1);
  t.checkExpect(node3.findHelp(new StrLengthOver3), sentinel1);
  t.checkExpect(node3.findHelp(new StrLengthOver2), node3);
}

// testing apply
void testApply(Tester t) {
  t.checkExpect(new StrLengthOver3.apply("kitty"), true);
  t.checkExpect(new StrLengthOver3.apply("cat"), false);
  t.checkExpect(new StrLengthOver2.apply("cat"), true);
  t.checkExpect(new StrLengthOver2.apply("h"), false);
}