Fix dist-test: Install dev dependencies in distribution and run PHPUnit from there

Author: bhavya-shukla-lrn

Makefile

@@ -98,7 +98,8 @@ dist-zip: clean-test clean-dist
 	zip -qr $(DIST).zip $(DIST)
 
 dist-test: dist-zip install-vendor
-	$(PHPUNIT) --do-not-cache-result --no-logging --bootstrap=$(DIST)/bootstrap.php --configuration=$(DIST)/phpunit.xml
+	cd $(DIST) && composer install $(COMPOSER_INSTALL_FLAGS)
+	cd $(DIST) && ./vendor/bin/phpunit --do-not-cache-result --no-logging
 
 ###
 # install vendor rules