Merge pull request #8146 from uranusjr/new-resolver-extra-in-explicit-requirement

New resolver: Carry extras info in ExplicitRequirement

src/pip/_internal/resolution/resolvelib/candidates.py

@@ -413,6 +413,8 @@ class ExtrasCandidate(Candidate):
         ]
         # Add a dependency on the exact base.
         # (See note 2b in the class docstring)
+        # FIXME: This does not work if the base candidate is specified by
+        # link, e.g. "pip install .[dev]" will fail.
         spec = "{}=={}".format(self.base.name, self.base.version)
         deps.append(factory.make_requirement_from_spec(spec, self.base._ireq))
         return deps

src/pip/_internal/resolution/resolvelib/factory.py

@@ -152,7 +152,7 @@ class Factory(object):
             #       Specifically, this might be needed in "name @ URL"
             #       syntax - need to check where that syntax is handled.
             cand = self._make_candidate_from_link(
-                ireq.link, extras=set(), parent=ireq,
+                ireq.link, extras=set(ireq.extras), parent=ireq,
             )
             return ExplicitRequirement(cand)
         return SpecifierRequirement(ireq, factory=self)

tests/functional/test_new_resolver.py

@@ -529,3 +529,80 @@ def test_new_resolver_handles_prerelease(
         *pip_args
     )
     assert_installed(script, pkg=expected_version)
+
+
+class TestExtraMerge(object):
+    """
+    Test installing a package that depends the same package with different
+    extras, one listed as required and the other as in extra.
+    """
+
+    def _local_with_setup(script, name, version, requires, extras):
+        """Create the package as a local source directory to install from path.
+        """
+        return create_test_package_with_setup(
+            script,
+            name=name,
+            version=version,
+            install_requires=requires,
+            extras_require=extras,
+        )
+
+    def _direct_wheel(script, name, version, requires, extras):
+        """Create the package as a wheel to install from path directly.
+        """
+        return create_basic_wheel_for_package(
+            script,
+            name=name,
+            version=version,
+            depends=requires,
+            extras=extras,
+        )
+
+    def _wheel_from_index(script, name, version, requires, extras):
+        """Create the package as a wheel to install from index.
+        """
+        create_basic_wheel_for_package(
+            script,
+            name=name,
+            version=version,
+            depends=requires,
+            extras=extras,
+        )
+        return name
+
+    @pytest.mark.parametrize(
+        "pkg_builder",
+        [
+            pytest.param(
+                _local_with_setup, marks=pytest.mark.xfail(strict=True),
+            ),
+            _direct_wheel,
+            _wheel_from_index,
+        ],
+    )
+    def test_new_resolver_extra_merge_in_package(
+        self, monkeypatch, script, pkg_builder,
+    ):
+        create_basic_wheel_for_package(script, "depdev", "1.0.0")
+        create_basic_wheel_for_package(
+            script,
+            "dep",
+            "1.0.0",
+            extras={"dev": ["depdev"]},
+        )
+        requirement = pkg_builder(
+            script,
+            name="pkg",
+            version="1.0.0",
+            requires=["dep"],
+            extras={"dev": ["dep[dev]"]},
+        )
+
+        script.pip(
+            "install", "--unstable-feature=resolver",
+            "--no-cache-dir", "--no-index",
+            "--find-links", script.scratch_path,
+            requirement + "[dev]",
+        )
+        assert_installed(script, pkg="1.0.0", dep="1.0.0", depdev="1.0.0")