title: "Weekly Tests"
showAbove: false
height: 200
data: 
  zip: "summaries.zip"
  url: "$RUN$.infections.txt.csv"
mark: 
  type: "point"
  strokeWidth: 3
  tooltip: true
encoding: 
  x: { field: "date", timeUnit: {"unit": "yearweek", "step": 1}, type: "temporal" }
  y: { field: "nTested", aggregate: "sum" }