---
- dict1:
    key1: value1
    key2:
      key21: value21
      key22: value22
  dict2:
    key3: value3
  result:
    key1: value1
    key2:
      key21: value21
      key22: value22
    key3: value3

- dict1:
    key1: value1
    key2:
      key21: value21
      key22: value22
  dict2:
    key1: value9
  result:
    key1: value9
    key2:
      key21: value21
      key22: value22

- dict1:
    key1: value1
    key2:
      key21: value21
      key22: value22
  dict2:
    key2: value9
  result:
    key1: value1
    key2: value9

- dict1:
    key1: value1
    key2:
      key21: value21
      key22: value22
  dict2:
    key2:
      key22: value99
  result:
    key1: value1
    key2:
      key21: value21
      key22: value99