dependency: consider source_name in is_same_source_as

src/poetry/core/packages/dependency.py

@@ -46,6 +46,8 @@ def __init__(
         source_reference: str | None = None,
         source_resolved_reference: str | None = None,
         source_subdirectory: str | None = None,
+        *,
+        source_name: str | None = None,
     ) -> None:
         from poetry.core.version.markers import AnyMarker
 
@@ -92,7 +94,7 @@ def __init__(
 
         self.is_root = False
         self._marker: BaseMarker = AnyMarker()
-        self.source_name: str | None = None
+        self.source_name: str | None = source_name
 
     @property
     def name(self) -> NormalizedName:
@@ -475,6 +477,11 @@ def create_from_pep_508(
 
         return dep
 
+    def is_same_source_as(self, other: PackageSpecification) -> bool:
+        if isinstance(other, Dependency) and self.source_name != other.source_name:
+            return False
+        return super().is_same_source_as(other)
+
     def __eq__(self, other: object) -> bool:
         if not isinstance(other, Dependency):
             return NotImplemented

tests/packages/test_dependency.py

@@ -4,6 +4,7 @@
 
 from poetry.core.constraints.version.exceptions import ParseConstraintError
 from poetry.core.packages.dependency import Dependency
+from poetry.core.packages.specification import PackageSpecification
 from poetry.core.version.markers import parse_marker
 
 
@@ -314,6 +315,26 @@ def test_create_from_pep_508_url_with_activated_extras() -> None:
     assert dependency.extras == {"fred", "bar"}
 
 
+@pytest.mark.parametrize(
+    "dependency, package_specification, expected",
+    [
+        (Dependency("a", "*"), Dependency("b", "*"), True),
+        (Dependency("a", "*", source_name="s"), Dependency("b", "*"), False),
+        (
+            Dependency("a", "*", source_name="s1"),
+            Dependency("b", "*", source_name="s2"),
+            False,
+        ),
+        (Dependency("a", "*", source_name="s"), PackageSpecification("b"), True),
+    ],
+)
+def test_is_same_source_as(
+    dependency: Dependency, package_specification: PackageSpecification, expected: bool
+) -> None:
+    assert dependency.is_same_source_as(package_specification) is expected
+    assert package_specification.is_same_source_as(dependency) is expected
+
+
 @pytest.mark.parametrize(
     "dependency1, dependency2, expected",
     [