Ensure we run linting on test files

.github/workflows/lint.yml

@@ -28,7 +28,7 @@ jobs:
 
     - name: Check import statement sorting
       run: |
-        isort -c --df my_project_name/ my-project-name
+        isort -c --df my_project_name/ my-project-name tests
 
     - name: Python syntax errors, undefined names, etc.
       run: |
@@ -36,4 +36,4 @@ jobs:
 
     - name: PEP8 formatting
       run: |
-        black --check --diff my_project_name/ my-project-name
+        black --check --diff my_project_name/ my-project-name tests

scripts-dev/lint.sh

@@ -11,7 +11,7 @@ if [ $# -ge 1 ]
 then
     files=$*
   else
-    files="my_project_name my-project-name"
+    files="my_project_name my-project-name tests"
 fi
 
 echo "Linting these locations: $files"