Add test project and initial test fixtures

tests/fixtures.py

@@ -0,0 +1,57 @@
+import time
+from pathlib import Path
+
+import poetry.factory
+import poetry.installation.pip_installer
+import poetry.utils.env
+import pytest
+import tox
+from poetry.core.packages import Package as PoetryPackage
+
+from tox_poetry_installer import utilities
+
+
+TEST_PROJECT_PATH = Path(__file__).parent.resolve() / "test-project"
+
+FAKE_VENV_PATH = Path("nowhere")
+
+
+class MockVirtualEnv:
+    class MockTestenvConfig:
+        envdir = FAKE_VENV_PATH
+
+    def __init__(self, *args, **kwargs):
+        self.envconfig = self.MockTestenvConfig()
+        self.installed = []
+
+    def is_valid_for_marker(self, *args, **kwargs):
+        return True
+
+
+class MockPipInstaller:
+    def __init__(self, env: MockVirtualEnv, **kwargs):
+        self.env = env
+
+    def install(self, package: PoetryPackage):
+        self.env.installed.append(package)
+        time.sleep(1)
+
+
+@pytest.fixture
+def mock_venv(monkeypatch):
+    monkeypatch.setattr(utilities, "convert_virtualenv", lambda venv: venv)
+    monkeypatch.setattr(
+        poetry.installation.pip_installer, "PipInstaller", MockPipInstaller
+    )
+    monkeypatch.setattr(tox.venv, "VirtualEnv", MockVirtualEnv)
+    monkeypatch.setattr(poetry.utils.env, "VirtualEnv", MockVirtualEnv)
+
+
+@pytest.fixture(scope="function")
+def mock_poetry_factory(monkeypatch):
+    pypoetry = poetry.factory.Factory().create_poetry(cwd=TEST_PROJECT_PATH)
+
+    def mock_factory(*args, **kwargs):
+        return pypoetry
+
+    monkeypatch.setattr(poetry.factory.Factory, "create_poetry", mock_factory)