add test for validation of the plugin package's manifest

pyproject.toml

@@ -61,8 +61,10 @@ linting = [
 ]
 testsuite = [
     "hypothesis >= 6.92.1",
+    "npe2",
     "pytest >= 7.1.0",
     "pytest-cov >= 5.0.0",
+    "typer",
 ]
 
 [tool.codespell]

tests/test_manifest_validation.py

@@ -0,0 +1,12 @@
+"""Test that the plugin will be able to be used by Napari."""
+
+import npe2.cli
+import pytest
+import typer
+
+
+def test_plugin_package_manifest_is_valid():
+    try:
+        npe2.cli.validate("looptrace-regionals-vis")
+    except typer.Exit as e:
+        pytest.fail(f"Manifest validation failed: {e}")