Achieve full test coverage

[wschella]

We need additional and effective (unit/spec/integration/util) tests so that we achieve a 100% testing coverage.

Related to:

• 35

• 37

• 34

• 50

• 40

• 41

• 21

• 20

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[rubensworks]

For this, we'll want to add a coverageThreshold: https://github.com/comunica/comunica/blob/master/package.json#L86-L92

[Tpt]

As discussed with @rubensworks, I will work on this issue via the Comunica Association.

[wschella]

Cool! Let me know if you have any questions.

[wschella]

Btw, you might also be interested in using the work already done in #118