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A test can be created in any one of the ways that any issue type can be created in JIRA. For example, clicking on the "Create Issue" link or "Create Test" link will bring up the following screen:
A test can be viewed in its entirety in the following "View Issue" page (click to enlarge):
On this screen, you'll find a toolbar that will allow you to access various features associated with editing and executing a test:
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