【修改】更新单元测试

example/plugin/example_plugin_load.lua

@@ -0,0 +1,11 @@
+function plugin_load(stellar, plug_env)
+    print("now load lua plugin example load")
+    print("this example aims to test load function")
+    plug_env.data = "load plugin env"
+    print("plugin env data is", plug_env.data)
+end
+
+function plugin_unload(plug_env)
+    print("now unload lua plugin example load")
+    print("plugin env data is", plug_env.data)
+end