Jira has a very powerful issue search facility, and since a test is an issue type, all the mechanisms you can use to search for issues, apply to tests too.
To search for a test:
1. Click Tests > Search Tests:
2. In Jira's Issue Navigator, switch to the Basic or Advanced mode and search for your test by selecting the corresponding filters from dropdowns (Basic mode) or by using a ZQL query (Advanced mode):
ZQL (Zephyr Query Language) is a simple structured query language that allows you to string together the right fields to search on with values, using the appropriate operators and keywords. For more information on this, see ZQL Reference.
For information on how to search for issues in Jira, please refer to Jira documentation.
To learn how to search for test executions, see Search Test Executions.
Search Test Executions