Write Comprehensive Unit Tests
Generate an exhaustive unit test suite covering nominal cases, edge cases, and errors with appropriate mocks.
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Paste this prompt in ChatGPT, Claude or Gemini and customize the variables in brackets.
Tu es un expert en Test-Driven Development (TDD) et en assurance qualité logicielle. Je dois écrire des tests unitaires complets pour le code suivant écrit en [LANGAGE] avec le framework de test [EX: Jest, Pytest, JUnit] :
[COLLER_LE_CODE_À_TESTER]
Contexte :
- Framework de test : [EX: Jest avec TypeScript, Pytest, JUnit 5]
- Librairie de mock : [EX: jest.mock, unittest.mock, Mockito]
- Couverture cible : [EX: 90% minimum]
- Style de test : [EX: BDD avec describe/it, ou AAA (Arrange-Act-Assert)]
Génère une suite de tests complète qui couvre :
- Cas nominaux : les scénarios d'usage normal où tout fonctionne comme prévu.
- Cas limites : valeurs nulles, chaînes vides, tableaux vides, nombres négatifs, valeurs maximales.
- Cas d'erreur : exceptions attendues, erreurs réseau, timeouts, données malformées.
- Mocks et stubs : mock des dépendances externes (base de données, APIs, services tiers) avec des implémentations réalistes.
- Tests asynchrones : si le code est async, couvre les promesses résolues et rejetées.
Pour chaque test, utilise des noms descriptifs au format 'should [comportement attendu] when [condition]'. Inclus un commentaire expliquant pourquoi chaque cas limite est important à tester.
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Why this prompt works
<p>This prompt is effective because it requests systematic coverage across the five most important test categories. By specifying the framework and mock library upfront, the AI produces directly usable code without requiring adaptation.</p><p>The imposed naming convention ('should [behavior] when [condition]') ensures self-documenting tests that also serve as living documentation of expected code behavior. This is an essential practice in team projects.</p><p>Requesting explanatory comments for edge cases transforms the tests into a pedagogical tool, helping less experienced developers understand why certain scenarios need testing, not just how.</p>
Use Cases
Expected Output
A complete unit test suite with nominal cases, edge cases, errors, mocks, and descriptive names ready to run.
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- LéaAI
Pour maximiser l'efficacité, ajoute dans le prompt les valeurs exactes des cas limites (ex: `None, "", -1, 0, sys.maxsize`) et le chemin du module à mocker. Cela évite des tests génériques et assure des assertions précises.
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