From 07930c40fc9379edb0b222b9022f737746f64ae8 Mon Sep 17 00:00:00 2001
From: Abhishek Hiremath <131762197+Abhi-DevHub@users.noreply.github.com>
Date: Tue, 21 Jul 2026 23:21:06 +0530
Subject: [PATCH 1/4] Allow dotted test filenames via dot-escape in
 compute_module_name

---
 src/_pytest/pathlib.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/_pytest/pathlib.py b/src/_pytest/pathlib.py
index 291bdf4ecbf..8024092af8e 100644
--- a/src/_pytest/pathlib.py
+++ b/src/_pytest/pathlib.py
@@ -931,6 +931,7 @@ def compute_module_name(root: Path, module_path: Path) -> str | None:
         return None
     if names[-1] == "__init__":
         names.pop()
+    names = [p.replace(".", "_") for p in names]
     return ".".join(names)
 
 

From f39a58fa801ba8558bb574055ad7b59b6427ec1f Mon Sep 17 00:00:00 2001
From: Abhishek Hiremath <131762197+Abhi-DevHub@users.noreply.github.com>
Date: Tue, 21 Jul 2026 23:22:01 +0530
Subject: [PATCH 2/4] Add tests for dotted test filenames in
 compute_module_name

---
 testing/test_pathlib.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/testing/test_pathlib.py b/testing/test_pathlib.py
index bd85b7e8fb4..a5aacdfccc1 100644
--- a/testing/test_pathlib.py
+++ b/testing/test_pathlib.py
@@ -1734,6 +1734,15 @@ def test_compute_module_name(tmp_path: Path) -> None:
         == "src.app.bar"
     )
 
+    assert (
+        compute_module_name(tmp_path, tmp_path / "foo.test.py")
+        == "foo_test"
+    )
+    assert (
+        compute_module_name(tmp_path, tmp_path / "src/app/foo.test.py")
+        == "src.app.foo_test"
+    )
+
 
 def validate_namespace_package(
     pytester: Pytester, paths: Sequence[Path], modules: Sequence[str]

From ce1d906b4cb85cf274aefff19321ca6e683330c0 Mon Sep 17 00:00:00 2001
From: Abhishek Hiremath <131762197+Abhi-DevHub@users.noreply.github.com>
Date: Tue, 21 Jul 2026 23:35:34 +0530
Subject: [PATCH 3/4] Add changelog entry for #14514

---
 changelog/14514.bugfix.rst | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 changelog/14514.bugfix.rst

diff --git a/changelog/14514.bugfix.rst b/changelog/14514.bugfix.rst
new file mode 100644
index 00000000000..9d426952acd
--- /dev/null
+++ b/changelog/14514.bugfix.rst
@@ -0,0 +1 @@
+Dots in test module filenames are now escaped with underscores to prevent ``pytest`` from misinterpreting them as package notation when computing the module name.

From 79fb34be0213505f2973bf567da9defc027db8e6 Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Tue, 21 Jul 2026 18:06:12 +0000
Subject: [PATCH 4/4] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 testing/test_pathlib.py | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/testing/test_pathlib.py b/testing/test_pathlib.py
index a5aacdfccc1..5d4c85bd6c0 100644
--- a/testing/test_pathlib.py
+++ b/testing/test_pathlib.py
@@ -1734,10 +1734,7 @@ def test_compute_module_name(tmp_path: Path) -> None:
         == "src.app.bar"
     )
 
-    assert (
-        compute_module_name(tmp_path, tmp_path / "foo.test.py")
-        == "foo_test"
-    )
+    assert compute_module_name(tmp_path, tmp_path / "foo.test.py") == "foo_test"
     assert (
         compute_module_name(tmp_path, tmp_path / "src/app/foo.test.py")
         == "src.app.foo_test"