Teachers:
Teacher 1
Teacher 2
Teacher 3
---------------------------------------
Students:
Student 1 s1@gmail.com 1234567890
Student 2 s2@gmail.com 2345678901
Student 3 s3@gmail.com 3456789012
Student 4 s4@gmail.com 4567890123
Student 5 s5@gmail.com 5678901234
Student 6 s6@gmail.com 6789012345
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Initial tree structure
|-Subjects
 |-English
 |-Physics
 |-Chemistry
 |-Maths
 |-Computer Science
---------------------------------------
Tree structure after adding lessons
|-Subjects
 |-English
  |-Lesson 1
  |-Lesson 2
  |-Lesson 3
 |-Physics
  |-Lesson 1
  |-Lesson 2
  |-Lesson 3
 |-Chemistry
  |-Lesson 1
  |-Lesson 2
  |-Lesson 3
 |-Maths
  |-Lesson 1
  |-Lesson 2
  |-Lesson 3
 |-Computer Science
  |-Lesson 1
  |-Lesson 2
  |-Lesson 3
---------------------------------------
Tree structure after adding workbooks
|-Subjects
 |-English
  |-Lesson 1
   |-Workbook 1
  |-Lesson 2
   |-Workbook 1
   |-Workbook 2
  |-Lesson 3
 |-Physics
  |-Lesson 1
   |-Workbook 1
   |-Workbook 2
  |-Lesson 2
   |-Workbook 1
  |-Lesson 3
 |-Chemistry
  |-Lesson 1
  |-Lesson 2
  |-Lesson 3
   |-Workbook 1
   |-Workbook 2
   |-Workbook 3
 |-Maths
  |-Lesson 1
   |-Workbook 1
   |-Workbook 2
   |-Workbook 3
  |-Lesson 2
  |-Lesson 3
 |-Computer Science
  |-Lesson 1
  |-Lesson 2
   |-Workbook 1
   |-Workbook 2
   |-Workbook 3
  |-Lesson 3
---------------------------------------
Tree structure after reordering subjects
|-Subjects
 |-Chemistry
  |-Lesson 1
  |-Lesson 2
  |-Lesson 3
   |-Workbook 1
   |-Workbook 2
   |-Workbook 3
 |-Physics
  |-Lesson 1
   |-Workbook 1
   |-Workbook 2
  |-Lesson 2
   |-Workbook 1
  |-Lesson 3
 |-English
  |-Lesson 1
   |-Workbook 1
  |-Lesson 2
   |-Workbook 1
   |-Workbook 2
  |-Lesson 3
 |-Maths
  |-Lesson 1
   |-Workbook 1
   |-Workbook 2
   |-Workbook 3
  |-Lesson 2
  |-Lesson 3
 |-Computer Science
  |-Lesson 1
  |-Lesson 2
   |-Workbook 1
   |-Workbook 2
   |-Workbook 3
  |-Lesson 3
---------------------------------------
Tree structure after moving subjects
|-Subjects
 |-Semester 1
  |-English
   |-Lesson 1
    |-Workbook 1
   |-Lesson 2
    |-Workbook 1
    |-Workbook 2
   |-Lesson 3
  |-Physics
   |-Lesson 1
    |-Workbook 1
    |-Workbook 2
   |-Lesson 2
    |-Workbook 1
   |-Lesson 3
  |-Chemistry
   |-Lesson 1
   |-Lesson 2
   |-Lesson 3
    |-Workbook 1
    |-Workbook 2
    |-Workbook 3
 |-Semester 2
  |-Maths
   |-Lesson 1
    |-Workbook 1
    |-Workbook 2
    |-Workbook 3
   |-Lesson 2
   |-Lesson 3
  |-Computer Science
   |-Lesson 1
   |-Lesson 2
    |-Workbook 1
    |-Workbook 2
    |-Workbook 3
   |-Lesson 3
---------------------------------------
Adding subjects to delete
|-Subjects
 |-Semester 1
  |-English
   |-Lesson 1
    |-Workbook 1
   |-Lesson 2
    |-Workbook 1
    |-Workbook 2
   |-Lesson 3
  |-Physics
   |-Lesson 1
    |-Workbook 1
    |-Workbook 2
   |-Lesson 2
    |-Workbook 1
   |-Lesson 3
  |-Chemistry
   |-Lesson 1
   |-Lesson 2
   |-Lesson 3
    |-Workbook 1
    |-Workbook 2
    |-Workbook 3
 |-Semester 2
  |-Maths
   |-Lesson 1
    |-Workbook 1
    |-Workbook 2
    |-Workbook 3
   |-Lesson 2
   |-Lesson 3
  |-Computer Science
   |-Lesson 1
   |-Lesson 2
    |-Workbook 1
    |-Workbook 2
    |-Workbook 3
   |-Lesson 3
 |-Dummy 1
 |-Dummy 2
---------------------------------------
Tree structure after deleting subjects
|-Subjects
 |-Semester 1
  |-English
   |-Lesson 1
    |-Workbook 1
   |-Lesson 2
    |-Workbook 1
    |-Workbook 2
   |-Lesson 3
  |-Physics
   |-Lesson 1
    |-Workbook 1
    |-Workbook 2
   |-Lesson 2
    |-Workbook 1
   |-Lesson 3
  |-Chemistry
   |-Lesson 1
   |-Lesson 2
   |-Lesson 3
    |-Workbook 1
    |-Workbook 2
    |-Workbook 3
 |-Semester 2
  |-Maths
   |-Lesson 1
    |-Workbook 1
    |-Workbook 2
    |-Workbook 3
   |-Lesson 2
   |-Lesson 3
  |-Computer Science
   |-Lesson 1
   |-Lesson 2
    |-Workbook 1
    |-Workbook 2
    |-Workbook 3
   |-Lesson 3
---------------------------------------
Actions
ADD Dummy 1
ADD Dummy 2
DELETE Dummy 1
DELETE Dummy 2
---------------------------------------
Undo actions
Tree structure after undoing actions
|-Subjects
 |-Semester 1
  |-English
   |-Lesson 1
    |-Workbook 1
   |-Lesson 2
    |-Workbook 1
    |-Workbook 2
   |-Lesson 3
  |-Physics
   |-Lesson 1
    |-Workbook 1
    |-Workbook 2
   |-Lesson 2
    |-Workbook 1
   |-Lesson 3
  |-Chemistry
   |-Lesson 1
   |-Lesson 2
   |-Lesson 3
    |-Workbook 1
    |-Workbook 2
    |-Workbook 3
 |-Semester 2
  |-Maths
   |-Lesson 1
    |-Workbook 1
    |-Workbook 2
    |-Workbook 3
   |-Lesson 2
   |-Lesson 3
  |-Computer Science
   |-Lesson 1
   |-Lesson 2
    |-Workbook 1
    |-Workbook 2
    |-Workbook 3
   |-Lesson 3
 |-Dummy 2
 |-Dummy 1
---------------------------------------
Hashing every node
Tree structure after hashing
|-Subjects : 0$0
 |-Semester 1 : 1$1
  |-English : 2$3
   |-Lesson 1 : 3$8
    |-Workbook 1 : 4$23
   |-Lesson 2 : 3$9
    |-Workbook 1 : 4$24
    |-Workbook 2 : 4$25
   |-Lesson 3 : 3$10
  |-Physics : 2$4
   |-Lesson 1 : 3$11
    |-Workbook 1 : 4$26
    |-Workbook 2 : 4$27
   |-Lesson 2 : 3$12
    |-Workbook 1 : 4$28
   |-Lesson 3 : 3$13
  |-Chemistry : 2$5
   |-Lesson 1 : 3$14
   |-Lesson 2 : 3$15
   |-Lesson 3 : 3$16
    |-Workbook 1 : 4$29
    |-Workbook 2 : 4$30
    |-Workbook 3 : 4$31
 |-Semester 2 : 1$2
  |-Maths : 2$6
   |-Lesson 1 : 3$17
    |-Workbook 1 : 4$32
    |-Workbook 2 : 4$33
    |-Workbook 3 : 4$34
   |-Lesson 2 : 3$18
   |-Lesson 3 : 3$19
  |-Computer Science : 2$7
   |-Lesson 1 : 3$20
   |-Lesson 2 : 3$21
    |-Workbook 1 : 4$35
    |-Workbook 2 : 4$36
    |-Workbook 3 : 4$37
   |-Lesson 3 : 3$22
---------------------------------------
Root to node(4$37) path
Subjects -> Semester 2 -> Computer Science -> Lesson 2 -> Workbook 3
---------------------------------------
Number of nodes: 38
---------------------------------------
End of tests. Add more tests here in the Test.java file.