How to write test cases: A step-by-step guide Step 1 – Test Case ID: In this step, the tester will assign a unique identifier to the test case. ... Step 2 – Test Case Description: ... Step 3 – Pre-Conditions: ... Step 4 – Test Steps: ... Step 5 – Test Data: ... Step 6 – Expected Result: ... Step 7 – Post Condition: ... Step 8 – Actual Result: