fix coverage script.

_tool/test-coverage.sh

@@ -14,8 +14,8 @@ set -xeu
 
 cd "${0%/*}"/..
 
-pub get
-pub global activate coverage
+dart pub get
+dart pub global activate coverage
 
 fail=false
 dart test --coverage coverage || fail=true
@@ -25,7 +25,7 @@ echo "fail=$fail"
 # shellcheck disable=SC2046
 jq -s '{coverage: [.[].coverage] | flatten}' $(find coverage -name '*.json' | xargs) > coverage/merged_json.cov
 
-pub global run coverage:format_coverage --packages=.packages -i coverage/merged_json.cov -l --report-on lib --report-on test > coverage/lcov.info
+dart pub global run coverage:format_coverage -i coverage/merged_json.cov -l --report-on lib --report-on test > coverage/lcov.info
 
 bash <(curl -s https://codecov.io/bash) -f coverage/lcov.info