1 files changed, 109 insertions, 0 deletions
diff --git a/setuptools/tests/test_editable_install.py b/setuptools/tests/test_editable_install.py
new file mode 100644
index 00000000..2957cba0
--- /dev/null
+++ b/setuptools/tests/test_editable_install.py
@@ -0,0 +1,109 @@
+import subprocess
+from textwrap import dedent
+
+import pytest
+import jaraco.envs
+import path
+
+
+@pytest.fixture
+def venv(tmp_path, setuptools_wheel):
+    env = jaraco.envs.VirtualEnv()
+    vars(env).update(
+        root=path.Path(tmp_path),  # workaround for error on windows
+        name=".venv",
+        create_opts=["--no-setuptools"],
+        req=str(setuptools_wheel),
+    )
+    return env.create()
+
+
+SETUP_SCRIPT_STUB = "__import__('setuptools').setup()"
+
+EXAMPLE = {
+    'pyproject.toml': dedent("""\
+        [build-system]
+        requires = ["setuptools", "wheel"]
+        build-backend = "setuptools.build_meta"
+
+        [project]
+        name = "mypkg"
+        version = "3.14159"
+        description = "This is a Python package"
+        dynamic = ["license", "readme"]
+        classifiers = [
+            "Development Status :: 5 - Production/Stable",
+            "Intended Audience :: Developers"
+        ]
+        urls = {Homepage = "http://github.com"}
+        dependencies = ['importlib-metadata; python_version<"3.8"']
+
+        [tool.setuptools]
+        package-dir = {"" = "src"}
+        packages = {find = {where = ["src"]}}
+
+        [tool.setuptools.dynamic]
+        license = "MIT"
+        license_files = ["LICENSE*"]
+        readme = {file = "README.rst"}
+
+        [tool.distutils.egg_info]
+        tag-build = ".post0"
+        """),
+    "MANIFEST.in": dedent("""\
+        global-include *.py *.txt
+        global-exclude *.py[cod]
+        """).strip(),
+    "README.rst": "This is a ``README``",
+    "LICENSE.txt": "---- placeholder MIT license ----",
+    "src": {
+        "mypkg": {
+            "__init__.py": dedent("""\
+                import sys
+
+                if sys.version_info[:2] >= (3, 8):
+                    from importlib.metadata import PackageNotFoundError, version
+                else:
+                    from importlib_metadata import PackageNotFoundError, version
+
+                try:
+                    __version__ = version(__name__)
+                except PackageNotFoundError:
+                    __version__ = "unknown"
+                """),
+            "__main__.py": dedent("""\
+                from importlib.resources import read_text
+                from . import __version__, __name__ as parent
+                from .mod import x
+
+                data = read_text(parent, "data.txt")
+                print(__version__, data, x)
+                """),
+            "mod.py": "x = ''",
+            "data.txt": "Hello World",
+        }
+    }
+}
+
+
+@pytest.mark.parametrize("setup_script", [SETUP_SCRIPT_STUB, None])
+def test_editable_with_pyproject(tmp_path, venv, setup_script):
+    if setup_script is None:
+        pytest.skip("Editable install currently only supported with `setup.py` stub")
+
+    project = tmp_path / "mypkg"
+    files = {**EXAMPLE, "setup.py": setup_script}
+    project.mkdir()
+    jaraco.path.build(files, prefix=project)
+
+    cmd = [venv.exe(), "-m", "pip", "install",
+           "--no-build-isolation",  # required to force current version of setuptools
+           "-e", str(project)]
+    print(str(subprocess.check_output(cmd), "utf-8"))
+
+    cmd = [venv.exe(), "-m", "mypkg"]
+    assert subprocess.check_output(cmd).strip() == b"3.14159.post0 Hello World"
+
+    (project / "src/mypkg/data.txt").write_text("foobar")
+    (project / "src/mypkg/mod.py").write_text("x = 42")
+    assert subprocess.check_output(cmd).strip() == b"3.14159.post0 foobar 42"