[test] Adding more coverage for filters

[josiah-roberts]

Related to #778

Test cases

• [x] Left-to-right filter count behavior
  • Verify that Faces has 15x <no face>
  • Unselect Keywords USA Road trip
  • Verify that Faces has 7x <no face>
• [ ] Date filter behavior
  • Move slider to July 5, 2015
  • Verify that Keywords has 2x USA
• [x] ~~Direct click behavior~~ covered in prior tests
• [x] Toggle-only behavior
• [ ] Missing data / mangled data behavior

[bpatrik]

Thank you! Let me know when this is ready for merging.

[josiah-roberts]

Thank you! Let me know when this is ready for merging.

Will do - likely won't be before next weekend. :pray:

[bpatrik]

I will reject this PR in the following days due to lack of activity.