### Question:
Rope { @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (!(obj instanceof Rope)) { return false; } Rope otherRope = (Rope) obj; return this.length == otherRope.length && this.start == otherRope.start && this.root.equals(otherRope.root); } private  Rope(Node root, int start, int length); static Rope from(String s); int length(); Rope slice(int start, int end); Rope replace(int start, int end, String newString); Rope concat(Rope anotherRope); @Override String toString(); @Override boolean equals(Object obj); @Override int hashCode();  }### Answer:
@Test public void testEquals() { Rope a = Rope.from("hello"); Rope b = Rope.from("world"); Rope c = Rope.from("hello"); assertNotEquals(a, b); assertEquals(a, c); }