Create Tests for Tags and Word Class Filtering

[ijemmao]

Is your feature request related to a problem? Please describe.
With the support of Tags and Word Classes, we will need tests to make sure the functionality works as expected.

Describe the solution you'd like
Create tests that check if:

• Filtering for tags works
• Filtering for word classes works
• The correct content length is getting returned

Describe alternatives you've considered
N/A

Additional context
N/A