Fix TestPoetry test cases.

Due to an update of poetry some behaviour changed
where it no longer supports the `src` layout of
python projects by default. This resulted in the
three tests of `TestPoetry` failing.
The fix creates the source files under the `test`
directory matching the package name.

* tests/test_pyvenv.py

Author: real-yfprojects

tests/test_pyvenv.py

@@ -196,7 +196,7 @@ class TestPoetry:
     async def test_simple_project(self, tmp_path: Path):
         """Test installing a simple project with poetry."""
         # create source files
-        src_location = tmp_path / "src"
+        src_location = tmp_path / "test"
         src_location.mkdir()
         src_location.joinpath("__init__.py").touch()
 
@@ -261,7 +261,7 @@ async def test_simple_project(self, tmp_path: Path):
     async def test_simple_project_with_optional_deps(self, tmp_path: Path):
         """Test installing a simple project with poetry."""
         # create source files
-        src_location = tmp_path / "src"
+        src_location = tmp_path / "test"
         src_location.mkdir()
         src_location.joinpath("__init__.py").touch()
 
@@ -351,7 +351,7 @@ async def test_simple_project_with_optional_deps(self, tmp_path: Path):
     async def test_create_two_concurrently(self, tmp_path: Path):
         """Test creating two environments concurrently."""
         # create source files
-        src_location = tmp_path / "src"
+        src_location = tmp_path / "test"
         src_location.mkdir()
         src_location.joinpath("__init__.py").touch()