testcases:
  - name: "testcase 1"
    inputs:
    - 1 : ["SnapshotArray", "snap"]
    - 2 : [[4], []]
    output: 
    - 1 : [null, 0]
  - name: "testcase 2"
    inputs:
    - 1 : ["SnapshotArray","set","snap","set","get", "set", "snap", "get"]
    - 2 : [[3], [0, 5], [], [0, 6], [0, 0], [0, 100], [], [1, 1]]
    output:
    - 1 : [null, null, 0, null, 5, null, 1, 0]
  - name: "testcase 3"
    inputs:
    - 1 : ["SnapshotArray","set","set","snap","get"]
    - 2 : [[2],[0, 65],[1, 56],[],[0, 0]]
    output:
    - 1 : [null, null, null, 0, 65]
  - name: "testcase 4"
    inputs:
    - 1 : ["SnapshotArray","set","set","snap","get"]
    - 2 : [[2],[0, 65],[1, 56],[],[1, 0]]
    output:
    - 1 : [null, null, null, 0, 56]
  - name: "testcase 5"
    inputs:
    - 1 : ["SnapshotArray","set","set","snap","get"]
    - 2 : [[2],[0, 80],[1, 50],[],[1, 0]]
    output:
    - 1 : [null, null, null, 0, 50]
  - name: "testcase 6"
    inputs:
    - 1 : ["SnapshotArray","set","set","set","set", "snap", "get", "set", "set", "set", "snap", "get", "get", "get"]
    - 2 : [[7], [0, 2], [1, 5], [2, 9], [3, 14], [], [2, 0], [4, 20], [5, 21], [2, 10], [],  [5, 1], [2, 1], [6, 1]]
    output:
    - 1 : [null, null, null, null, null, 0, 9, null, null, null, 1, 21, 10, 0]