[Bug] ListTestCase interface exec failed.

[YuLuo]

Description:
The ListTestCase interface throws a 500 exception when a test resource yaml file other than the one created exists in the atest directory.

Repro steps:

1. git pull repo
2. go build -o atest main.go
3. ./atest server
4. access front page and new create test resource.
5. then click node.

Note: If there are privacy concerns, sanitize the data prior to

caused by the presence of yaml files other than the test resource file in the atest executable directory.