Install test plugin package from wheel rather than source

Author: mgorny

tests/artifacts/test-plugin-package/pyproject.toml

@@ -6,3 +6,4 @@ build-backend = "flit_core.buildapi"
 name = "test-plugin-package"
 version = "0"
 description = "Installable plugin for testing"
+requires-python = ">=3.9"

tests/artifacts/test_plugin_package-0-py3-none-any.whl

@@ -40,3 +40,13 @@ def mocked_entry_points(
         MockedEntryPoint("second", "tests.mocked_plugins:MockedPluginB"),
         MockedEntryPoint("third", "tests.mocked_plugins:MockedPluginC"),
     ]
+
+
+@pytest.fixture(scope="session")
+def test_plugin_package_req() -> str:
+    installable_package = (
+        Path("tests/artifacts/test_plugin_package-0-py3-none-any.whl")
+        .absolute()
+        .as_posix()
+    )
+    return f"test-plugin-package @ file://{installable_package}"

tests/conftest.py

@@ -6,7 +6,6 @@
 from abc import ABC
 from abc import abstractproperty
 from email import message_from_string
-from pathlib import Path
 from typing import Any
 
 import pytest
@@ -445,16 +444,13 @@ def test_load_plugins_from_entry_points(mocked_entry_points: None) -> None:
         }
 
 
-def test_install_plugin():
-    installable_package = (
-        Path("tests/artifacts/test-plugin-package").absolute().as_posix()
-    )
+def test_install_plugin(test_plugin_package_req: str):
     metadata = VariantMetadata(
         namespace_priorities=["installable_plugin"],
         providers={
             "installable_plugin": ProviderInfo(
                 plugin_api="test_plugin_package:TestPlugin",
-                requires=[f"test-plugin-package @ file://{installable_package}"],
+                requires=[test_plugin_package_req],
             ),
         },
     )

tests/plugins/test_loader.py

@@ -11,22 +11,14 @@
 from variantlib.plugins.py_envs import python_env
 
 
-@pytest.fixture(scope="session")
-def test_package_req() -> str:
-    installable_package = (
-        Path("tests/artifacts/test-plugin-package").absolute().as_posix()
-    )
-    return f"test-plugin-package @ file://{installable_package}"
-
-
 def test_system_env():
     with python_env(isolated=False) as env:
         assert env.venv_path is None
         assert env.python_executable == Path(sys.executable)
 
 
 @pytest.mark.parametrize("custom", [False, True])
-def test_isolated_env(custom: bool, tmp_path: Path, test_package_req: str):
+def test_isolated_env(custom: bool, tmp_path: Path, test_plugin_package_req: str):
     if custom:
         venv.create(tmp_path, with_pip=True)
     with python_env(isolated=True, venv_path=tmp_path if custom else None) as env:
@@ -40,7 +32,7 @@ def test_isolated_env(custom: bool, tmp_path: Path, test_package_req: str):
             "python.exe" if os.name == "nt" else "python"
         )
 
-        env.install([test_package_req])
+        env.install([test_plugin_package_req])
 
         purelib = Path(sysconfig.get_path("purelib", vars={"base": str(env.venv_path)}))
         assert (purelib / "test_plugin_package.py").exists()