Which of the following is testing how parts of your system interact with other parts of your system?1 pointEnd-to-end testingIntegration testingPost-hoc testingUnit testing

The type of testing that checks how parts of your system interact with other parts of your system is called Integration testing.

Here's a step-by-step explanation:

1. Unit Testing: This is the first level of software testing where the smallest testable parts of a software are tested. This is not the correct answer because it only tests individual components of a system, not their interaction.

2. Integration Testing: This is the phase in software testing in which individual software modules are combined and tested as a group. This is the correct answer because it specifically tests how different parts of your system work together.

3. End-to-End Testing: This type of testing involves testing of a complete application environment in a situation that mimics real-world use, such as interacting with a database, using network communications, or interacting with other hardware, applications, or systems if appropriate. While this does test interactions, it's more about testing the entire system from start to finish, not just the interactions between individual parts.

4. Post-hoc Testing: This is a type of testing that is done after the fact, often to try and replicate bugs or issues that have been reported. It doesn't specifically test interactions between parts of a system.

So, the answer is Integration Testing.