Install pytest

Author: tannewt

.github/workflows/run-tests.yml

@@ -54,6 +54,7 @@ jobs:
         if: failure()
         working-directory: tests
       - name: Run Zephyr build tests
+        if: matrix.test == 'all'
         run: make -C ports/zephyr-cp test
     # Not working after MicroPython v1.23 merge.
     # - name: Build native modules

requirements-dev.txt

@@ -41,3 +41,4 @@ setuptools
 
 # For zephyr port
 tomlkit
+pytest