From c0cd44307a6a593f7657699e1a3825a27411a209 Mon Sep 17 00:00:00 2001
From: Shay <assetoverflow@icloud.com>
Date: Fri, 3 Jul 2026 17:11:57 -0700
Subject: [PATCH] fix(tests): preserve environment in formation subprocess
 tests to ensure xdist hermeticity

---
 tests/formation/test_compose.py                    | 3 ++-
 tests/formation/test_template_composed_relation.py | 3 ++-
 tests/formation/test_template_falsification.py     | 3 ++-
 tests/formation/test_template_identity_anchor.py   | 3 ++-
 tests/formation/test_template_procedural.py        | 3 ++-
 5 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/tests/formation/test_compose.py b/tests/formation/test_compose.py
index 36b0c0d5..308df8e4 100644
--- a/tests/formation/test_compose.py
+++ b/tests/formation/test_compose.py
@@ -10,6 +10,7 @@ Per Phase 3 of ``docs/formation_pipeline_plan.md``:
 """
 
 from __future__ import annotations
+import os
 
 import subprocess
 import sys
@@ -236,7 +237,7 @@ class TestCrossSession:
             capture_output=True,
             text=True,
             cwd=str(repo_root),
-            env={"PYTHONHASHSEED": "random", "PATH": ""},
+            env={**os.environ, "PYTHONHASHSEED": "random", "PATH": ""},
         )
         assert result.stdout.strip() == in_proc
 
diff --git a/tests/formation/test_template_composed_relation.py b/tests/formation/test_template_composed_relation.py
index 06773604..9da05a74 100644
--- a/tests/formation/test_template_composed_relation.py
+++ b/tests/formation/test_template_composed_relation.py
@@ -1,6 +1,7 @@
 """Tests for ``formation.templates.composed_relation``."""
 
 from __future__ import annotations
+import os
 
 import subprocess
 import sys
@@ -187,6 +188,6 @@ class TestCrossSession:
             [sys.executable, "-c", script],
             check=True, capture_output=True, text=True,
             cwd=str(repo_root),
-            env={"PYTHONHASHSEED": "random", "PATH": ""},
+            env={**os.environ, "PYTHONHASHSEED": "random", "PATH": ""},
         )
         assert result.stdout.strip() == in_proc
diff --git a/tests/formation/test_template_falsification.py b/tests/formation/test_template_falsification.py
index 2a9b3358..71c8d625 100644
--- a/tests/formation/test_template_falsification.py
+++ b/tests/formation/test_template_falsification.py
@@ -1,6 +1,7 @@
 """Tests for ``formation.templates.falsification``."""
 
 from __future__ import annotations
+import os
 
 import subprocess
 import sys
@@ -132,6 +133,6 @@ class TestCrossSession:
             [sys.executable, "-c", script],
             check=True, capture_output=True, text=True,
             cwd=str(repo_root),
-            env={"PYTHONHASHSEED": "random", "PATH": ""},
+            env={**os.environ, "PYTHONHASHSEED": "random", "PATH": ""},
         )
         assert result.stdout.strip() == in_proc
diff --git a/tests/formation/test_template_identity_anchor.py b/tests/formation/test_template_identity_anchor.py
index ebf7cb45..a64a6224 100644
--- a/tests/formation/test_template_identity_anchor.py
+++ b/tests/formation/test_template_identity_anchor.py
@@ -1,6 +1,7 @@
 """Tests for ``formation.templates.identity_anchor``."""
 
 from __future__ import annotations
+import os
 
 import subprocess
 import sys
@@ -154,6 +155,6 @@ class TestCrossSession:
             [sys.executable, "-c", script],
             check=True, capture_output=True, text=True,
             cwd=str(repo_root),
-            env={"PYTHONHASHSEED": "random", "PATH": ""},
+            env={**os.environ, "PYTHONHASHSEED": "random", "PATH": ""},
         )
         assert result.stdout.strip() == in_proc
diff --git a/tests/formation/test_template_procedural.py b/tests/formation/test_template_procedural.py
index efec52df..46cc0b41 100644
--- a/tests/formation/test_template_procedural.py
+++ b/tests/formation/test_template_procedural.py
@@ -1,6 +1,7 @@
 """Tests for ``formation.templates.procedural``."""
 
 from __future__ import annotations
+import os
 
 import subprocess
 import sys
@@ -157,6 +158,6 @@ class TestCrossSession:
             [sys.executable, "-c", script],
             check=True, capture_output=True, text=True,
             cwd=str(repo_root),
-            env={"PYTHONHASHSEED": "random", "PATH": ""},
+            env={**os.environ, "PYTHONHASHSEED": "random", "PATH": ""},
         )
         assert result.stdout.strip() == in_proc