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Writing Test Cases

Goal of a Test Case

A test case should verify reproducible behavior and provide a clear outcome: pass or fail.

  1. Name and objective
  2. Initial conditions
  3. Stimuli and timing sequence
  4. Expected signals or states
  5. Assertions and tolerances

Example Template

# TC-001 Motor Speed Follows Setpoint

## Goal
Verify that speed_actual follows speed_setpoint within 1.5 s.

## Setup
- Model: inverter_avg.json
- Initial speed_setpoint: 0

## Stimulus
- t=0.2 s: speed_setpoint = 1200

## Expected Result
- speed_actual reaches 1200 +- 50 by t=1.7 s

## Assertions
- assert abs(speed_actual - 1200) <= 50 for t in [1.6, 1.7]

Good Practice

  • Use small, focused test cases instead of large end-to-end monoliths
  • Use clear naming conventions for signals
  • Document thresholds and tolerances explicitly
  • Use report export actively for regression tracking