Sometimes backend work feels like being the ghost in the machine nobody sees what you do, but everything breaks when you stop doing it. 👻💻
#backend#developers#tech#programming
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Almost all Kubernetes practitioners experience OOMKilled error, but only a few understand how it happens.
OOMKilled occurs in Kubernetes when a container exceeds its memory limit or tries to access unavailable resources on a node, flagged by exit code 137.
Point worth noting:
If a pod is terminate due to a memory issue. it doesn’t necessarily mean it will be removed from the node.
If the node’s restart policy is set to ‘Always’, the pod will attempt to restart.
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System integration testing changed how I test my applications.
Have you heard about it?
This type of test gives you the highest level of confidence.
Let's take a modular monolith and test the integration between modules.
A modular monolith consists of multiple modules (duh), each with a distinct responsibility. Modules represent high-level components with well-defined boundaries.
The modules essentially group together related functionalities (use cases).
What's the best way to test module interactions?
System integration testing (SIT) is an approach to verifying the collaboration of these modules.
During system integration testing, we want to ensure that all these modules interact correctly and fulfill our system's business requirements.
Here's a hypothetical scenario:
- A user registers with our application through the Users Module
- The Users Module publishes an integration event to notify other modules
- The Ticketing Module handles the event and creates a customer record
How would you write a test for this scenario?
If you want to learn more about system integration testing, I wrote a high-level guide.
Read it here: milanjovanovic.tech/blog/tes…
What do you think about this testing approach?
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