try removing IS_WINDOWS_CI special case

This may fix #326, because this would also fix the lack of permissions that causes the error message there to suggest using `--user`.

tests/test_project.py

@@ -8,7 +8,6 @@
 import pytest
 
 IS_WINDOWS = platform.startswith('win')
-IS_WINDOWS_CI = IS_WINDOWS and os.environ.get('CI', False)
 
 
 def test_project_folder(cookies):
@@ -33,17 +32,11 @@ def run(args: Sequence[str], dirpath: os.PathLike) -> subprocess.CompletedProces
 
 @pytest.fixture
 def project_env_bin_dir(tmp_path):
-    if IS_WINDOWS_CI:
-        # Creating virtualenv does not work on Windows CI,
-        # falling back to using current pip3 dir
-        pip = Path(which('pip3'))
-        bin_dir = pip.parent
-    else:
-        env_output = run(['python3', '-m', 'venv', 'env'], tmp_path)
-        assert env_output.returncode == 0
-        bin_dir = str(tmp_path / 'env' / 'bin')
-        if IS_WINDOWS:
-            bin_dir = str(tmp_path / 'env' / 'Scripts')
+    env_output = run(['python3', '-m', 'venv', 'env'], tmp_path)
+    assert env_output.returncode == 0
+    bin_dir = str(tmp_path / 'env' / 'bin')
+    if IS_WINDOWS:
+        bin_dir = str(tmp_path / 'env' / 'Scripts')
     return str(bin_dir) + os.sep
 
 
@@ -98,9 +91,6 @@ def test_subpackage(baked_with_development_dependencies, project_env_bin_dir):
     subsubpackage.mkdir()
     (subsubpackage / '__init__.py').write_text('FOO = "bar"', encoding="utf-8")
 
-    if IS_WINDOWS_CI:
-        # On Windows CI python and pip executable are in different paths
-        bin_dir = ''
     # sdist and bdist_wheel both call build command to create build/ dir
     # So instead of looking in distribution archives we can look in build/ dir
     result = run([f'{bin_dir}python', 'setup.py', 'build'], project_dir)