Makefile tweak: JUnit jar is configurable (and more flexible).

Author: davexparker

prism/Makefile

@@ -512,9 +512,10 @@ count_loc:
 ###########
 
 # Run all unit tests
+JUNIT_JAR = $(wildcard $(PRISM_LIB_DIR)/junit-platform-console-standalone-*.jar)
 unittests: make_tests
 	# Provide Regex to match our test classes. If none is given, only certain test classes are excluded by default.
-	$(JAVA) -jar lib/junit-platform-console-standalone.jar -cp classes --include-classname '^(Test.*|.+[.$$]Test.*|.+Tests?[.$$].+|.*Tests?)$$' -scan-classpath --details=summary
+	$(JAVA) -jar $(JUNIT_JAR) -cp classes --include-classname '^(Test.*|.+[.$$]Test.*|.+Tests?[.$$].+|.*Tests?)$$' -scan-classpath --details=summary
 
 # Run a single test case from the test suite (useful quick check that the build was ok)
 test: