Write individual test for each baked in template

[grosscol]

Similar to #41. Write an individual test for each template. This will let us focus on verifying that each produce sane results when given actual data.

Use the mtx data or a subset of the mtx data. Ensure each template uses the passed in data.

• [x] ComparisonBarGraphHOR
• [x] ComparisonBarGraphVERT
• [x] ComparisonLineGraph
• [x] EnhancedLeaderboard
• [x] Leaderboard
• [x] PairedBarGraph
• [ ] PairedBarGraphHOR
• [x] IUDGraph
• [x] SingleBarTemplate
• [x] SingleLineGraph
• [x] TopPerformerGraph

[grosscol]

Addressed by and related to #52, #55, #57