install pytest in run_test

Author: Jeff Whitaker

.github/workflows/build-wheels.yml

@@ -111,7 +111,7 @@ jobs:
     - name: Build and Install Wheels
       run: |
         BUILD_DEPENDS="cython $NP_DEP"
-        TEST_DEPENDS="pytest $NP_DEP"
+        TEST_DEPENDS="$NP_DEP"
         source multibuild/common_utils.sh
         source multibuild/travis_steps.sh
         echo "------- BEFORE INSTALL --------"

config.sh

@@ -3,5 +3,6 @@
 function run_tests {
     # Runs tests on installed distribution from an empty directory
     python --version
+    pip install pytest pytest-cov
     pytest -v ../cftime/test/test_cftime.py
 }