readd tests for grayskull too

conda_pip/cli.py

@@ -17,6 +17,8 @@
 
 
 def configure_parser(parser: argparse.ArgumentParser):
+    from .dependencies import BACKENDS
+
     add_parser_help(parser)
     add_parser_prefix(parser)
     add_output_and_prompt_options(parser)
@@ -51,6 +53,13 @@ def configure_parser(parser: argparse.ArgumentParser):
         default="conda-forge",
         help="Where to look for conda dependencies.",
     )
+    install.add_argument(
+        "--backend",
+        metavar="TOOL",
+        default="pip",
+        choices=BACKENDS,
+        help="Which tool to use for PyPI packaging dependency resolution.",
+    )
     install.add_argument("packages", metavar="package", nargs="+")
 
 
@@ -74,7 +83,7 @@ def execute(args: argparse.Namespace) -> None:
             *packages_to_process,
             prefer_on_conda=not args.force_with_pip,
             channel=args.conda_channel,
-            backend="pip",
+            backend=args.backend,
             prefix=prefix,
         )
 

conda_pip/dependencies/__init__.py

@@ -7,6 +7,10 @@
 
 logger = getLogger(f"conda.{__name__}")
 
+BACKENDS = (
+    "grayskull",
+    "pip",
+)
 
 def analyze_dependencies(
     *packages: str,

tests/test_install.py

@@ -5,16 +5,20 @@
 from conda.testing import CondaCLIFixture, TmpEnvFixture
 from conda.testing.integration import package_is_installed
 
+from conda_pip.dependencies import BACKENDS
 
+@pytest.mark.parametrize("backend", BACKENDS)
 @pytest.mark.parametrize("spec", ["numpy", "numpy=1.20"])
-def test_conda_pip_install_numpy(tmp_env: TmpEnvFixture, conda_cli: CondaCLIFixture, spec: str):
+def test_conda_pip_install_numpy(tmp_env: TmpEnvFixture, conda_cli: CondaCLIFixture, spec: str, backend: str):
     with tmp_env("python=3.9", "pip") as prefix:
         out, err, rc = conda_cli(
             "pip",
             "-p",
             prefix,
             "--yes",
             "install",
+            "--backend",
+            backend,
             spec,
         )
         print(out)