use junit test to replace main() for testing

506f1896 · ylqin · a6cff8f6 · 506f1896
--- a/xxl-job-admin/src/test/java/com/xxl/job/admin/core/util/JacksonUtilTest.java
+++ b/xxl-job-admin/src/test/java/com/xxl/job/admin/core/util/JacksonUtilTest.java