Count the number of JavaScript tests in a git repo every day

countTests.sh

#!/bin/bash

echo '"days ago","tests"' > testCounts.csv

for i in $(seq 1 365);
do
  git checkout "$(git rev-list -n 1 --before="$i days ago" origin/master)"

  matches=$(\
    find spec/javascripts -name "*.js" -o -name "*.jsx" | \
    xargs ag --stats "it\(" | \
    ag "^\d+\ matches" | \
    cut -d " " -f1 \
  )

  echo "$i,$matches" >> testCounts.csv
done

git checkout master