Update Makefile

Author: staabm

Makefile

@@ -173,5 +173,14 @@ infection:
 	version=$(shell jq -r '.packages[] | select(.name == "infection/infection") | .version' build-infection/composer.lock); \
 	wget https://github.com/infection/infection/releases/download/$$version/infection.phar --no-clobber;
 	chmod +x infection.phar
-	php infection.phar --ignore-msi-with-no-mutations --logger-text=php://stdout
+	XDEBUG_MODE=coverage php tests/vendor/bin/paratest \
+	  --coverage-xml=tmp/coverage/coverage-xml \
+	  --log-junit=tmp/coverage/junit.xml
+	php infection.phar \
+	  --git-diff-base=origin/2.1.x \
+	  --git-diff-lines \
+	  --coverage=tmp/coverage \
+	  --skip-initial-tests \
+	  --ignore-msi-with-no-mutations \
+	  --logger-text=php://stdout
 	rm infection.json5 infection.phar