Making sure the coverage uses the same Mocha options as npm test.

scripts/cov

@@ -16,6 +16,10 @@ $COV --exclude node_modules,.git,test --path relative . ./src-cov 1>&2
 cp -r ./test ./src-cov/test
 cp ./package.json ./src-cov
 
-$MOCHA --reporter $REPORTER --recursive --timeout 120000 --compilers 'coffee:coffee-script/register' './src-cov/test/**/*-test.coffee'
+find ./src-cov/test/ -name '*-test.coffee' | xargs "$MOCHA" \
+  --compilers 'coffee:coffee-script/register' \
+  --reporter "$REPORTER" \
+  --timeout 120000 \
+  --recursive
 
 rm -rf ./src-cov