test(branch): remove obsolete test_branch.py after branch module refactor

The old test tests/unit/pkgmgr/actions/test_branch.py has been removed because:

- it targeted the previous monolithic pkgmgr.actions.branch module structure
- its patch targets no longer match the refactored code
- its responsibilities are now fully covered by the new, dedicated unit,
  integration, and E2E tests for branch actions and CLI wiring

This avoids redundant coverage and prevents misleading or broken tests
after the branch refactor.

https://chatgpt.com/share/693bcc8d-b84c-800f-8510-8d6c66faf627

tests/unit/pkgmgr/actions/branch/test_close_branch.py

@@ -0,0 +1,55 @@
+import unittest
+from unittest.mock import patch, MagicMock
+
+from pkgmgr.actions.branch.close_branch import close_branch
+from pkgmgr.core.git import GitError
+
+
+class TestCloseBranch(unittest.TestCase):
+    @patch("pkgmgr.actions.branch.close_branch.input", return_value="y")
+    @patch("pkgmgr.actions.branch.close_branch.get_current_branch", return_value="feature-x")
+    @patch("pkgmgr.actions.branch.close_branch._resolve_base_branch", return_value="main")
+    @patch("pkgmgr.actions.branch.close_branch.run_git")
+    def test_close_branch_happy_path(self, run_git, resolve, current, input_mock):
+        close_branch(None, cwd=".")
+        expected = [
+            (["fetch", "origin"],),
+            (["checkout", "main"],),
+            (["pull", "origin", "main"],),
+            (["merge", "--no-ff", "feature-x"],),
+            (["push", "origin", "main"],),
+            (["branch", "-d", "feature-x"],),
+            (["push", "origin", "--delete", "feature-x"],),
+        ]
+        actual = [call.args for call in run_git.call_args_list]
+        self.assertEqual(actual, expected)
+
+    @patch("pkgmgr.actions.branch.close_branch.get_current_branch", return_value="main")
+    @patch("pkgmgr.actions.branch.close_branch._resolve_base_branch", return_value="main")
+    def test_refuses_to_close_base_branch(self, resolve, current):
+        with self.assertRaises(RuntimeError):
+            close_branch(None)
+
+    @patch("pkgmgr.actions.branch.close_branch.input", return_value="n")
+    @patch("pkgmgr.actions.branch.close_branch.get_current_branch", return_value="feature-x")
+    @patch("pkgmgr.actions.branch.close_branch._resolve_base_branch", return_value="main")
+    @patch("pkgmgr.actions.branch.close_branch.run_git")
+    def test_close_branch_aborts_on_no(self, run_git, resolve, current, input_mock):
+        close_branch(None, cwd=".")
+        run_git.assert_not_called()
+
+    @patch("pkgmgr.actions.branch.close_branch.get_current_branch", return_value="feature-x")
+    @patch("pkgmgr.actions.branch.close_branch._resolve_base_branch", return_value="main")
+    @patch("pkgmgr.actions.branch.close_branch.run_git")
+    def test_close_branch_force_skips_prompt(self, run_git, resolve, current):
+        close_branch(None, cwd=".", force=True)
+        self.assertGreater(len(run_git.call_args_list), 0)
+
+    @patch("pkgmgr.actions.branch.close_branch.get_current_branch", side_effect=GitError("fail"))
+    def test_close_branch_errors_if_cannot_detect_branch(self, current):
+        with self.assertRaises(RuntimeError):
+            close_branch(None)
+
+
+if __name__ == "__main__":
+    unittest.main()