Improve test coverage

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UPDATE: basic tests for the TimelineChart component. Probable next steps:

• Reimplement VPChart(done) and VPIChart to make them testable (see Use Vue for all DOM manipulations #62)
• Write/improve a basic test suite for all 3 components + the crow Form/app itself
• Implement tests to compare our integration output's to BioRAD

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Update: there should ideally bemore tests (especially if the code is reused for other projects such as GloBAM), but at least the current test suite pass again.