You want to run tests inside a container but only for Python files changed in your Git branch. Which approach is best?

hard📝 Workflow Q9 of 15

Docker - in CI/CD

AManually copy changed files into container before testing

BRun pytest on all files inside container ignoring Git changes

CRun tests outside container only on changed files

DUse a script to list changed files, then run pytest on those inside the container

Step-by-Step Solution

Solution:

Step 1: Identify selective testing method
Listing changed files via Git and passing them to pytest inside container runs only needed tests.
Step 2: Evaluate other options
Running all tests wastes time, manual copying is error-prone, and running outside container loses environment consistency.
Final Answer:
Use a script to list changed files, then run pytest on those inside the container -> Option D
Quick Check:
Selective testing = script + container pytest [OK]

Quick Trick: Filter changed files with Git, then run tests inside container [OK]

Common Mistakes:

Master "in CI/CD" in Docker

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