Add integration test with napari (#65)

This adds some test to ensure the plugin can be programmatically added
as a widget to the napari viewer.

.github/workflows/test_and_deploy.yml

@@ -7,17 +7,36 @@ on:
   push:
     branches:
       - main
-      - npe2
     tags:
       - "v*" # Push events to matching v*, i.e. v1.0, v20.15.10
   pull_request:
     branches:
       - main
-      - npe2
   workflow_dispatch:
 
 jobs:
+  validate:
+    name: validate with npe2
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Python 3.10
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.10'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install .
+
+      - name: Validate with npe2
+        run: npe2 validate napari-metadata
+
   test:
+    needs: [validate]
     name: ${{ matrix.platform }} py${{ matrix.python-version }}
     runs-on: ${{ matrix.platform }}
     strategy:

src/napari_metadata/_tests/test_napari.py

@@ -0,0 +1,7 @@
+from napari_metadata._widget import MetadataWidget
+
+
+def test_add_widget_to_napari(make_napari_viewer):
+    viewer = make_napari_viewer()
+    _, widget = viewer.window.add_plugin_dock_widget("napari-metadata")
+    assert isinstance(widget, MetadataWidget)