<p class="isSelectedEnd">When we talk about integration tests, the goal is usually pretty clear: verify that different parts of the system work together as expected. But then comes the tricky question&mdash;how much mocking or stubbing is acceptable before an &ldquo;integration test&rdquo; stops being truly integrated? This is something many developers struggle with, especially when dealing with complex architectures or microservices.

<p class="isSelectedEnd">Mocking and stubbing are incredibly useful tools. They help prevent tests from becoming slow, flaky, or dependent on external systems you can&rsquo;t control. For example, if your service relies on a payment gateway or a third-party API, it makes sense to replace those calls with predictable mock responses. Nobody wants tests failing at 2 a.m. because some external sandbox environment decided to take a nap.

<p class="isSelectedEnd">But the problem arises when mocks take over everything. If 80% of your test environment is simulated, are you really testing how components interact? Probably not. Over-mocking often creates a false sense of confidence&mdash;your tests pass, but your application still breaks in production because the mocked behavior never truly matched the real world.

<p class="isSelectedEnd">A healthier approach is to mock only what you must mock. Databases? Usually better tested with real or ephemeral instances. Internal services? Often worth including in the test flow. External providers? Those are prime candidates for stubbing. The key is to keep the test environment as realistic as possible without making it fragile or painfully slow.

<p class="isSelectedEnd">Tools like Keploy are also stepping in to help strike the right balance. Instead of hand-crafting mocks, Keploy can record real traffic and generate test cases that feel more natural and reliable, reducing the risk of unrealistic mock behavior.

At the end of the day,integration tests should give you confidence&mdash;not illusions. Use mocks wisely, keep things honest, and aim for a setup that mirrors production as closely as practical.