add tests for add, query, update, delete

[euledge]

Resolved Issues

• close add test methods for adds, query, update, delete #17

Reference Issue

#9

Details of Changes

• Adds Collection Items
• Get Collection Item
• Query Collection Items
• Update Collection Item
• Delete Collection Item

Please review

Query testing is unstable

Testing for Query simple conditions is not stable and may result in success or error.
Allways Testing for Query advanced conditions is not success

 FAIL  tests/firestore_spec.test.ts (11.316 s)
  ● Query Collection Items › should get item from the database using the simple conditions

    expect(received).toBe(expected) // Object.is equality

    Expected: 1
    Received: 0

      150 |     const usersByAge = await queryCollectionItems<User>(db, path, simpleConditions)
      151 |
    > 152 |     expect(usersByAge.length).toBe(1)
          |                               ^
      153 |     expect(usersByAge[0].name).toBe('John Doe')
      154 |   })
      155 |

      at Object.<anonymous> (tests/firestore_spec.test.ts:152:31)

  ● Query Collection Items › should get item from the database using the advanced conditions

    Error querying collection: Error: 3 INVALID_ARGUMENT: inequality filter property and first sort order must be the same: age and name

      108 |     }))
      109 |   } catch (error) {
    > 110 |     throw new Error(`Error querying collection: ${error}`)
          |           ^
      111 |   }
      112 | }
      113 |

      at queryCollectionItems (src/lib/queryCollectionItems.ts:110:11)
      at Object.<anonymous> (tests/firestore_spec.test.ts:175:24)

Delete testing

delete for a non-existing document is success, don't raise exception.

See. https://googleapis.dev/nodejs/firestore/latest/DocumentReference.html#delete