src/index.js require a test coverage

**Describe the bug**
I mention a similar problem before. we don't have a lot of tests, related to index.js
This is cause a problem - when someone make some changes - we don't have tests, that will prevent errors, related to export of json files.

as example of things that should be covered at this PR: #460

**To Reproduce**
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4. See error

**Expected behavior**
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**Additional context**
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