November 2018
Intermediate to advanced
346 pages
8h 12m
English
Content preview from Hands-On Dependency Injection in Go
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Downstream currency service
The exchange package makes HTTP calls to an external service for exchange rates. Currently, when the tests are run, it will make calls to that service. This means that our tests have the following features:
- They require an internet connection
- They are dependent on the downstream service being accessible and working properly
- They require proper credentials and quotas from the downstream service
All of these factors are either out of our control or otherwise wholly unrelated to our service. If we take the perspective that the reliability of our tests is a measure of the quality of our work, then our quality is now dependent on things we cannot control. This is far from ideal.
We could create a fake currency service ...
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