                 for r in arr { insertArray.insert(r) }
             }
             for r in insertArray.sorted(by: { a, b in arc4random() & 0x1 == 0 }) {
-                try? btree.insert(r)
+                try! btree.insert(r)
             }
             for r in insertArray.sorted(by: { a, b in arc4random() & 0x1 == 0 }) {
                 XCTAssert(btree.contains(r))

                XCTAssert(!btree.contains(r))
            }
            
            try? btree.insert(2)
            print(btree)
        }
    }

            print(btree)
            btree.remove(hashValue: 2)
            print(btree)
            try! btree.insert(2)
            let interval = 0..<50
            for i in interval { try? btree.insert(i) }
            XCTAssert(btree.count == 50)
