Fix new mypy failures in tests/unit/resolution_resolvelib/

Before, during, or after merge b392833a0f1cff1bbee1ac6dbe0270cccdd0c11f,
new code was added that now requires typing.

3 files changed, 16 insertions, 5 deletions

diff --git a/news/9951f555-1210-4fd3-9a37-fc301a12e9f5.trivial.rst b/news/9951f555-1210-4fd3-9a37-fc301a12e9f5.trivial.rst
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/news/9951f555-1210-4fd3-9a37-fc301a12e9f5.trivial.rst
diff --git a/src/pip/_internal/resolution/resolvelib/provider.py b/src/pip/_internal/resolution/resolvelib/provider.py
index a3250b351..c2203933e 100644
--- a/src/pip/_internal/resolution/resolvelib/provider.py
+++ b/src/pip/_internal/resolution/resolvelib/provider.py
@@ -71,7 +71,7 @@ class PipProvider(_ProviderBase):
         identifier: str,
         resolutions: Mapping[str, Candidate],
         candidates: Mapping[str, Iterator[Candidate]],
-        information: Mapping[str, Iterator["PreferenceInformation"]],
+        information: Mapping[str, Iterable["PreferenceInformation"]],
     ) -> "Preference":
         """Produce a sort key for given requirement based on preference.
 
diff --git a/tests/unit/resolution_resolvelib/test_provider.py b/tests/unit/resolution_resolvelib/test_provider.py
index 970254280..09b887f09 100644
--- a/tests/unit/resolution_resolvelib/test_provider.py
+++ b/tests/unit/resolution_resolvelib/test_provider.py
@@ -1,21 +1,32 @@
+from typing import TYPE_CHECKING, List, Optional
+
 from pip._vendor.resolvelib.resolvers import RequirementInformation
 
 from pip._internal.models.candidate import InstallationCandidate
 from pip._internal.models.link import Link
 from pip._internal.req.constructors import install_req_from_req_string
+from pip._internal.resolution.resolvelib.factory import Factory
 from pip._internal.resolution.resolvelib.provider import PipProvider
 from pip._internal.resolution.resolvelib.requirements import SpecifierRequirement
 
+if TYPE_CHECKING:
+    from pip._internal.resolution.resolvelib.provider import PreferenceInformation
+
 
-def build_requirement_information(name, parent):
+def build_requirement_information(
+    name: str, parent: Optional[InstallationCandidate]
+) -> List["PreferenceInformation"]:
     install_requirement = install_req_from_req_string(name)
-    requirement_information = RequirementInformation(
-        requirement=SpecifierRequirement(install_requirement), parent=parent
+    # RequirementInformation is typed as a tuple, but it is a namedtupled.
+    # https://github.com/sarugaku/resolvelib/blob/7bc025aa2a4e979597c438ad7b17d2e8a08a364e/src/resolvelib/resolvers.pyi#L20-L22
+    requirement_information: PreferenceInformation = RequirementInformation(
+        requirement=SpecifierRequirement(install_requirement),  # type: ignore[call-arg]
+        parent=parent,
     )
     return [requirement_information]
 
 
-def test_provider_known_depths(factory):
+def test_provider_known_depths(factory: Factory) -> None:
     # Root requirement is specified by the user
     # therefore has an infered depth of 1
     root_requirement_name = "my-package"