adding tests for getAll method

[roberto-butti]

• adding tests for getAll method
• fix some edge cases thanks to the tests

Pull request type

Jira Link: INT-

• [x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [x] Other (please describe): added test case (integration tests)

How to test this PR

execute composer all-check

What is the new behavior?

The getAll returned value is more aligned with the js client (an array of items). With the third parameter, you can retrieve all the responses instead of the entries.

Other information