## Description
Add tests for the new methods added to the Zkey module that will be preserved for DefaultView:
Getters:
* [x] getRowById
* [x] getZObjectKeyByRowId
* [x] getZObjectValueByRowId
* [x] getChildrenByParentRowId
* [x] getRowByKeyPath
* [x] getZObjectTerminalValue
* [x] getZObjectFunctionCallFunctionId
* [x] getZObjectFunctionCallArguments
* [x] getZFunctionArgumentDeclarations
* [ ] getZStringTerminalValue
* [ ] getZReferenceTerminalValue
* [ ] getZMonolingualTextValue
* [ ] getZMonolingualLangValue
* [ ] getZCodeLanguage
* [ ] getZCode
* [ ] getZComposition
* [ ] getZCodeId
* [ ] getZCodeFunction
* [ ] getZBooleanValue
* [ ] getZObjectTypeByRowId
* [ ] getDepthByRowId
* [ ] getParentRowId
* [ ] getNextRowId
* [ ] isInsideComposition
* [x] getZTypeStringRepresentation
Mutations:
* [ ] setValueByRowIndex
* [ ] pushRow
Actions:
* [ ] setValueByRowIdAndPath
* [ ] setValueByRowId
* [ ] injectZObjectFromRowId
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## Completion checklist
* [ ] Before closing this task, review one by one the checklist available here: https://www.mediawiki.org/wiki/Abstract_Wikipedia_team/Definition_of_Done#Front-end_Task/Bug_Completion_Checklist