Fix mocking path for CI

Author: thatbudakguy

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
     name: test
     runs-on: ubuntu-latest
     env:
-      MICROPYPATH: "$(pwd)/tests/mocks:$(pwd):.frozen:~/.micropython/lib:/usr/lib/micropython"
+      MICROPYPATH: "$(pwd):.frozen:~/.micropython/lib:/usr/lib/micropython:$(pwd)/tests/mocks"
     steps:
       - uses: actions/checkout@v2
       - name: Build micropython