diff --git a/e2e_tests/helpers.py b/e2e_tests/helpers.py
index 2cd507c..7ed8137 100644
--- a/e2e_tests/helpers.py
+++ b/e2e_tests/helpers.py
@@ -174,7 +174,10 @@ class TempGitRepositoryWorktree:
             git --git-dir .git-main-working-tree config core.bare true
         """
         )
-        return self.tmpdir.name
+        commit = git.Repo(
+            f"{self.tmpdir.name}/.git-main-working-tree"
+        ).head.commit.hexsha
+        return (self.tmpdir.name, commit)
 
     def __exit__(self, exc_type, exc_val, exc_tb):
         del self.tmpdir
diff --git a/e2e_tests/test_worktree_clean.py b/e2e_tests/test_worktree_clean.py
index 17f16ce..bdcf22e 100644
--- a/e2e_tests/test_worktree_clean.py
+++ b/e2e_tests/test_worktree_clean.py
@@ -6,7 +6,7 @@ from helpers import *
 
 
 def test_worktree_clean():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test", "--track", "origin/test"], cwd=base_dir)
         assert cmd.returncode == 0
         assert "test" in os.listdir(base_dir)
@@ -17,7 +17,7 @@ def test_worktree_clean():
 
 
 def test_worktree_clean_refusal_no_tracking_branch():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test"], cwd=base_dir)
         assert cmd.returncode == 0
 
@@ -31,7 +31,7 @@ def test_worktree_clean_refusal_no_tracking_branch():
 
 
 def test_worktree_clean_refusal_uncommited_changes_new_file():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test", "--track", "origin/test"], cwd=base_dir)
         assert cmd.returncode == 0
 
@@ -47,7 +47,7 @@ def test_worktree_clean_refusal_uncommited_changes_new_file():
 
 
 def test_worktree_clean_refusal_uncommited_changes_changed_file():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test", "--track", "origin/test"], cwd=base_dir)
         assert cmd.returncode == 0
 
@@ -63,7 +63,7 @@ def test_worktree_clean_refusal_uncommited_changes_changed_file():
 
 
 def test_worktree_clean_refusal_uncommited_changes_cleand_file():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test", "--track", "origin/test"], cwd=base_dir)
         assert cmd.returncode == 0
 
@@ -81,7 +81,7 @@ def test_worktree_clean_refusal_uncommited_changes_cleand_file():
 
 
 def test_worktree_clean_refusal_commited_changes():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test", "--track", "origin/test"], cwd=base_dir)
         assert cmd.returncode == 0
 
@@ -99,7 +99,7 @@ def test_worktree_clean_refusal_commited_changes():
 
 
 def test_worktree_clean_refusal_tracking_branch_mismatch():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test", "--track", "origin/test"], cwd=base_dir)
         assert cmd.returncode == 0
 
@@ -117,7 +117,7 @@ def test_worktree_clean_refusal_tracking_branch_mismatch():
 
 
 def test_worktree_clean_fail_from_subdir():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test"], cwd=base_dir)
         assert cmd.returncode == 0
 
diff --git a/e2e_tests/test_worktree_config_presistent_branch.py b/e2e_tests/test_worktree_config_presistent_branch.py
index c8f3f6a..9174b77 100644
--- a/e2e_tests/test_worktree_config_presistent_branch.py
+++ b/e2e_tests/test_worktree_config_presistent_branch.py
@@ -6,7 +6,7 @@ from helpers import *
 
 
 def test_worktree_never_clean_persistent_branches():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         with open(os.path.join(base_dir, "grm.toml"), "w") as f:
             f.write(
                 """
@@ -33,7 +33,7 @@ def test_worktree_never_clean_persistent_branches():
 
 
 def test_worktree_clean_branch_merged_into_persistent():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         with open(os.path.join(base_dir, "grm.toml"), "w") as f:
             f.write(
                 """
@@ -72,7 +72,7 @@ def test_worktree_clean_branch_merged_into_persistent():
 
 
 def test_worktree_no_clean_unmerged_branch():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         with open(os.path.join(base_dir, "grm.toml"), "w") as f:
             f.write(
                 """
@@ -105,7 +105,7 @@ def test_worktree_no_clean_unmerged_branch():
 
 
 def test_worktree_delete_branch_merged_into_persistent():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         with open(os.path.join(base_dir, "grm.toml"), "w") as f:
             f.write(
                 """
diff --git a/e2e_tests/test_worktree_conversion.py b/e2e_tests/test_worktree_conversion.py
index 47bb16b..33d5312 100644
--- a/e2e_tests/test_worktree_conversion.py
+++ b/e2e_tests/test_worktree_conversion.py
@@ -23,7 +23,7 @@ def test_convert():
 
 
 def test_convert_already_worktree():
-    with TempGitRepositoryWorktree() as git_dir:
+    with TempGitRepositoryWorktree() as (git_dir, _commit):
         before = checksum_directory(git_dir)
 
         cmd = grm(["wt", "convert"], cwd=git_dir)
diff --git a/e2e_tests/test_worktree_status.py b/e2e_tests/test_worktree_status.py
index 86a92d8..d55fa66 100644
--- a/e2e_tests/test_worktree_status.py
+++ b/e2e_tests/test_worktree_status.py
@@ -4,7 +4,7 @@ from helpers import *
 
 
 def test_worktree_status():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test"], cwd=base_dir)
         assert cmd.returncode == 0
 
@@ -16,7 +16,7 @@ def test_worktree_status():
 
 
 def test_worktree_status_fail_from_subdir():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test"], cwd=base_dir)
         assert cmd.returncode == 0
 
diff --git a/e2e_tests/test_worktrees.py b/e2e_tests/test_worktrees.py
index 0e95659..82516bf 100644
--- a/e2e_tests/test_worktrees.py
+++ b/e2e_tests/test_worktrees.py
@@ -15,7 +15,7 @@ import os.path
 def test_worktree_add_simple(
     remote_branch_already_exists, has_config, has_default, has_prefix
 ):
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         if has_config:
             with open(os.path.join(base_dir, "grm.toml"), "w") as f:
                 f.write(
@@ -75,7 +75,7 @@ def test_worktree_add_simple(
 
 
 def test_worktree_add_into_subdirectory():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "dir/test"], cwd=base_dir)
         assert cmd.returncode == 0
 
@@ -93,7 +93,7 @@ def test_worktree_add_into_subdirectory():
 
 
 def test_worktree_add_into_invalid_subdirectory():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "/dir/test"], cwd=base_dir)
         assert cmd.returncode == 1
         assert "dir" not in os.listdir(base_dir)
@@ -111,7 +111,7 @@ def test_worktree_add_into_invalid_subdirectory():
 def test_worktree_add_with_tracking(
     remote_branch_already_exists, has_config, has_default, has_prefix
 ):
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         if has_config:
             with open(os.path.join(base_dir, "grm.toml"), "w") as f:
                 f.write(
@@ -171,7 +171,7 @@ def test_worktree_add_with_tracking(
 def test_worktree_add_with_explicit_no_tracking(
     has_config, has_default, has_prefix, track
 ):
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         if has_config:
             with open(os.path.join(base_dir, "grm.toml"), "w") as f:
                 f.write(
@@ -218,7 +218,7 @@ def test_worktree_add_with_explicit_no_tracking(
 def test_worktree_add_with_config(
     remote_branch_already_exists, has_default, has_prefix
 ):
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         with open(os.path.join(base_dir, "grm.toml"), "w") as f:
             f.write(
                 f"""
@@ -274,7 +274,7 @@ def test_worktree_add_with_config(
 
 
 def test_worktree_delete():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test", "--track", "origin/test"], cwd=base_dir)
         assert cmd.returncode == 0
         assert "test" in os.listdir(base_dir)
@@ -291,7 +291,7 @@ def test_worktree_delete():
 
 
 def test_worktree_delete_refusal_no_tracking_branch():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test"], cwd=base_dir)
         assert cmd.returncode == 0
 
@@ -307,7 +307,7 @@ def test_worktree_delete_refusal_no_tracking_branch():
 
 
 def test_worktree_delete_refusal_uncommited_changes_new_file():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test", "--track", "origin/test"], cwd=base_dir)
         assert cmd.returncode == 0
 
@@ -325,7 +325,7 @@ def test_worktree_delete_refusal_uncommited_changes_new_file():
 
 
 def test_worktree_delete_refusal_uncommited_changes_changed_file():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test", "--track", "origin/test"], cwd=base_dir)
         assert cmd.returncode == 0
 
@@ -343,7 +343,7 @@ def test_worktree_delete_refusal_uncommited_changes_changed_file():
 
 
 def test_worktree_delete_refusal_uncommited_changes_deleted_file():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test", "--track", "origin/test"], cwd=base_dir)
         assert cmd.returncode == 0
 
@@ -363,7 +363,7 @@ def test_worktree_delete_refusal_uncommited_changes_deleted_file():
 
 
 def test_worktree_delete_refusal_commited_changes():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test", "--track", "origin/test"], cwd=base_dir)
         assert cmd.returncode == 0
 
@@ -383,7 +383,7 @@ def test_worktree_delete_refusal_commited_changes():
 
 
 def test_worktree_delete_refusal_tracking_branch_mismatch():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test", "--track", "origin/test"], cwd=base_dir)
         assert cmd.returncode == 0
 
@@ -403,7 +403,7 @@ def test_worktree_delete_refusal_tracking_branch_mismatch():
 
 
 def test_worktree_delete_force_refusal():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test"], cwd=base_dir)
         assert cmd.returncode == 0
 
@@ -413,7 +413,7 @@ def test_worktree_delete_force_refusal():
 
 
 def test_worktree_add_delete_add():
-    with TempGitRepositoryWorktree() as base_dir:
+    with TempGitRepositoryWorktree() as (base_dir, _commit):
         cmd = grm(["wt", "add", "test", "--track", "origin/test"], cwd=base_dir)
         assert cmd.returncode == 0
         assert "test" in os.listdir(base_dir)