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.teamai/skills/common/golang-samber-do/references/testing.md

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+# Testing with samber/do
+
+## Container Cloning
+
+Clone containers for isolated tests:
+
+```go
+func TestUserService(t *testing.T) {
+    // Create test container by cloning main container
+    testInjector := mainInjector.Clone()
+
+    // Override with mocks
+    mockDB := &MockDatabase{}
+    do.OverrideValue(testInjector, mockDB)
+
+    // Test with mocked dependencies
+    service := do.MustInvoke[UserService](testInjector)
+    // ... test code
+}
+```
+
+## Reusable Test Helpers
+
+```go
+func SetupTestContainer(t *testing.T) do.Injector {
+    injector := do.New()
+
+    do.Provide(injector, func(i do.Injector) (Database, error) {
+        return &MockDatabase{}, nil
+    })
+
+    return injector
+}
+```
+
+## Quick Reference
+
+### Testing & Overrides
+
+| Function                         | Purpose                         |
+| -------------------------------- | ------------------------------- |
+| `injector.Clone()`               | Clone container for testing     |
+| `injector.CloneWithOpts()`       | Clone with custom options       |
+| `do.Override[T]()`               | Replace service (use in tests)  |
+| `do.OverrideNamed[T]()`          | Replace named service           |
+| `do.OverrideValue[T]()`          | Replace value service           |
+| `do.OverrideNamedValue[T]()`     | Replace named value             |
+| `do.OverrideTransient[T]()`      | Replace transient factory       |
+| `do.OverrideNamedTransient[T]()` | Replace named transient factory |