Do you remember the pill about test doubles? I hope you do because they are important not only in unit tests.

Unit tests are cool.

But integration tests are cooler 😎 (...well, not cooler, but more abstract).

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They help us to answer the questions about our system like:

• Can we establish a connection to an HTTP endpoint?
• Can we establish a connection to the database?
• Can serialize/deserialize objects for transport?
• Can we accept incoming requests?
• Can we handle the exceptions and errors properly?

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As you see in the picture below, we want to answer the questions above in isolation from the entire system. To achieve such isolation we need... test doubles! 😂

Another way of presenting a high-level view of the system might be the hexagonal architecture depicted below. Integration tests test... well... integration with other systems.

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Quick email.

Quick tip.

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All the best,
Bartosz