Merge pull request #193 from dnephin/why-cover-so-slow

Speed up testing with coverage

scripts/test/unit-with-coverage

@@ -1,6 +1,10 @@
 #!/usr/bin/env bash
 set -eu -o pipefail
 
+# install test dependencies once before running tests for each package. This
+# reduces the runtime from 200s down to 23s
+go test -i $@
+
 for pkg in $@; do
     ./scripts/test/unit \
         -cover \