If you have deleted a test case, it will reside in trash bin located in the three-dots-menu:
From the trash bin, you can restore a previously deleted test case (either a singular case or in bulk):
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Please note that only individual test cases can be restored from the Trash bin. If you’ve accidentally deleted a test suite containing multiple cases, the test cases can be recovered, but the suite itself must be recreated.
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Recovered test cases without an associated suite will be moved to the root of the project under the label “Test cases without a suite.”