installing dev packages

Author: shimwell

.github/workflows/tests.yml

@@ -1,6 +1,6 @@
 name: Tests
 
-on: [push, pull_request]
+on: [pull_request]
 
 jobs:
   tests-with-conda-install:
@@ -38,6 +38,6 @@ jobs:
           python-version: 3.11
       - name: Install dependencies
         run: |
-          python -m pip install .
+          python -m pip install .[dev]
       - name: Run tests
         run: python -m pytest -v