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Field Manual PHP / Laravel reference

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Testing

Tests prove requirements, invariants, and failure behavior.

What it is

Tests prove requirements, invariants, and failure behavior.

When to use it

Prioritize observable outcomes and adversarial cases.

Syntax

happy path | invalid | boundary | denied | duplicate | failure | concurrent

Example

// For a transfer:
// Exact balance -> succeeds
// One minor unit too much -> fails without changes
// Unauthorized source -> forbidden
// Duplicate request -> one transfer
// Second write fails -> first rolled back

Common mistakes

Tests mirroring internal implementation miss behavior; production-engine concurrency needs integration tests.

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