dry-run and fast-deps behavior testing

news/12183.trivial.rst

@@ -0,0 +1 @@
+Add test cases for some behaviors of ``install --dry-run`` and ``--use-feature=fast-deps``.

tests/functional/test_fast_deps.py

@@ -2,12 +2,14 @@
 import json
 import os
 import pathlib
+import re
 from os.path import basename
 from typing import Iterable
 
 from pip._vendor.packaging.utils import canonicalize_name
 from pytest import mark
 
+from pip._internal.utils.misc import hash_file
 from tests.lib import PipTestEnvironment, TestData, TestPipResult
 
 
@@ -101,3 +103,36 @@ def test_hash_mismatch(script: PipTestEnvironment, tmp_path: pathlib.Path) -> No
         expect_error=True,
     )
     assert "DO NOT MATCH THE HASHES" in result.stderr
+
+
+@mark.network
+def test_hash_mismatch_existing_download_for_metadata_only_wheel(
+    script: PipTestEnvironment, tmp_path: pathlib.Path
+) -> None:
+    """Metadata-only wheels from PEP 658 or fast-deps check for hash matching in
+    a separate code path than when the wheel is downloaded all at once. Make sure we
+    still check for hash mismatches."""
+    reqs = tmp_path / "requirements.txt"
+    reqs.write_text("idna==2.10")
+    dl_dir = tmp_path / "downloads"
+    dl_dir.mkdir()
+    idna_wheel = dl_dir / "idna-2.10-py2.py3-none-any.whl"
+    idna_wheel.write_text("asdf")
+    result = script.pip(
+        "download",
+        # Ensure that we have a metadata-only dist for idna.
+        "--use-feature=fast-deps",
+        "-r",
+        str(reqs),
+        "-d",
+        str(dl_dir),
+        allow_stderr_warning=True,
+    )
+    assert re.search(
+        r"WARNING: Previously-downloaded file.*has bad hash", result.stderr
+    )
+    # This is the correct hash for idna==2.10.
+    assert (
+        hash_file(str(idna_wheel))[0].hexdigest()
+        == "b97d804b1e9b523befed77c48dacec60e6dcb0b5391d57af6a65a312a90648c0"
+    )

tests/functional/test_install.py

@@ -7,7 +7,7 @@
 import textwrap
 from os.path import curdir, join, pardir
 from pathlib import Path
-from typing import Dict, List, Tuple
+from typing import Dict, Iterable, List, Optional, Tuple
 
 import pytest
 
@@ -20,6 +20,7 @@
     PipTestEnvironment,
     ResolverVariant,
     TestData,
+    TestPipResult,
     _create_svn_repo,
     _create_test_package,
     create_basic_wheel_for_package,
@@ -2371,14 +2372,68 @@ def test_install_logs_pip_version_in_debug(
     assert_re_match(pattern, result.stdout)
 
 
-def test_install_dry_run(script: PipTestEnvironment, data: TestData) -> None:
-    """Test that pip install --dry-run logs what it would install."""
-    result = script.pip(
-        "install", "--dry-run", "--find-links", data.find_links, "simple"
+def install_find_links(
+    script: PipTestEnvironment,
+    data: TestData,
+    args: Iterable[str],
+    *,
+    dry_run: bool,
+    target_dir: Optional[Path],
+) -> TestPipResult:
+    return script.pip(
+        "install",
+        *(
+            (
+                "--target",
+                str(target_dir),
+            )
+            if target_dir is not None
+            else ()
+        ),
+        *(("--dry-run",) if dry_run else ()),
+        "--no-index",
+        "--find-links",
+        data.find_links,
+        *args,
+    )
+
+
+@pytest.mark.parametrize(
+    "with_target_dir",
+    (True, False),
+)
+def test_install_dry_run_nothing_installed(
+    script: PipTestEnvironment,
+    data: TestData,
+    tmpdir: Path,
+    with_target_dir: bool,
+) -> None:
+    """Test that pip install --dry-run logs what it would install, but doesn't actually
+    install anything."""
+    if with_target_dir:
+        install_dir = tmpdir / "fake-install"
+        install_dir.mkdir()
+    else:
+        install_dir = None
+
+    result = install_find_links(
+        script, data, ["simple"], dry_run=True, target_dir=install_dir
     )
     assert "Would install simple-3.0" in result.stdout
     assert "Successfully installed" not in result.stdout
 
+    script.assert_not_installed("simple")
+    if with_target_dir:
+        assert not os.listdir(install_dir)
+
+    # Ensure that the same install command would normally have worked if not for
+    # --dry-run.
+    install_find_links(script, data, ["simple"], dry_run=False, target_dir=install_dir)
+    if with_target_dir:
+        assert os.listdir(install_dir)
+    else:
+        script.assert_installed(simple="3.0")
+
 
 @pytest.mark.skipif(
     sys.version_info < (3, 11),

tests/unit/metadata/test_metadata.py

@@ -129,3 +129,17 @@ def test_dist_found_in_zip(tmp_path: Path) -> None:
     dist = get_environment([location]).get_distribution("pkg")
     assert dist is not None and dist.location is not None
     assert Path(dist.location) == Path(location)
+
+
+@pytest.mark.parametrize(
+    "path",
+    (
+        "/path/to/foo.egg-info".replace("/", os.path.sep),
+        # Tests issue fixed by https://github.com/pypa/pip/pull/2530
+        "/path/to/foo.egg-info/".replace("/", os.path.sep),
+    ),
+)
+def test_trailing_slash_directory_metadata(path: str) -> None:
+    dist = get_directory_distribution(path)
+    assert dist.raw_name == dist.canonical_name == "foo"
+    assert dist.location == "/path/to".replace("/", os.path.sep)

tests/unit/test_req.py

@@ -23,7 +23,6 @@
     PreviousBuildDirError,
 )
 from pip._internal.index.package_finder import PackageFinder
-from pip._internal.metadata import select_backend
 from pip._internal.models.direct_url import ArchiveInfo, DirectUrl, DirInfo, VcsInfo
 from pip._internal.models.link import Link
 from pip._internal.network.session import PipSession
@@ -600,22 +599,6 @@ def test_url_preserved_editable_req(self) -> None:
         assert req.link is not None
         assert req.link.url == url
 
-    @pytest.mark.parametrize(
-        "path",
-        (
-            "/path/to/foo.egg-info".replace("/", os.path.sep),
-            # Tests issue fixed by https://github.com/pypa/pip/pull/2530
-            "/path/to/foo.egg-info/".replace("/", os.path.sep),
-        ),
-    )
-    def test_get_dist(self, path: str) -> None:
-        req = install_req_from_line("foo")
-        req.metadata_directory = path
-        dist = req.get_dist()
-        assert isinstance(dist, select_backend().Distribution)
-        assert dist.raw_name == dist.canonical_name == "foo"
-        assert dist.location == "/path/to".replace("/", os.path.sep)
-
     def test_markers(self) -> None:
         for line in (
             # recommended syntax