Explain a situation where you might use a mock object in Go testing and how you would implement it.
- When testing a component that depends on external services.
- When testing pure Go functions with no dependencies.
- When testing user interface (UI) components.
- When testing Go's standard library functions.
Mock objects are used in Go testing when you want to isolate the component being tested from its external dependencies, such as databases, external APIs, or services. By replacing real external dependencies with mock objects, you can control the behavior and responses of those dependencies, making tests more predictable and repeatable. To implement a mock object in Go, you typically create a struct that implements an interface matching the external dependency, providing customized behavior for testing scenarios.
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