diff --git a/tests/unit/pkgmgr/actions/install/installers/nix/test_legacy.py b/tests/unit/pkgmgr/actions/install/installers/nix/test_legacy.py
index b6c8978..ba68093 100644
--- a/tests/unit/pkgmgr/actions/install/installers/nix/test_legacy.py
+++ b/tests/unit/pkgmgr/actions/install/installers/nix/test_legacy.py
@@ -115,105 +115,7 @@ class TestNixFlakeInstaller(unittest.TestCase):
 
         install_cmds = self._install_cmds_from_calls(subproc_mock.call_args_list)
         self.assertEqual(install_cmds, [f"nix profile install {self.repo_dir}#default"])
-
-    def test_nix_flake_run_mandatory_failure_raises(self) -> None:
-        """
-        For a generic repository, 'default' is mandatory.
-        A non-zero return code must raise SystemExit with that code.
-        """
-        ctx = DummyCtx(identifier="some-lib", repo_dir=self.repo_dir)
-        installer = NixFlakeInstaller()
-
-        # retry layer does one attempt (non-403), then fallback does final attempt => 2 installs
-        install_results = [self._cp(1), self._cp(1)]
-
-        def fake_subprocess_run(cmd, *args, **kwargs):
-            if isinstance(cmd, str) and cmd.startswith("nix profile list --json"):
-                return self._cp(0, stdout='{"elements": []}', stderr="")
-            if isinstance(cmd, str) and cmd.startswith("nix profile install "):
-                return install_results.pop(0)
-            return self._cp(0)
-
-        buf = io.StringIO()
-        with patch("pkgmgr.actions.install.installers.nix.installer.shutil.which") as which_mock, patch(
-            "pkgmgr.actions.install.installers.nix.installer.os.path.exists", return_value=True
-        ), patch(
-            "pkgmgr.actions.install.installers.nix.runner.subprocess.run", side_effect=fake_subprocess_run
-        ) as subproc_mock, redirect_stdout(buf):
-            self._enable_nix_in_module(which_mock)
-
-            self.assertTrue(installer.supports(ctx))
-            with self.assertRaises(SystemExit) as cm:
-                installer.run(ctx)
-
-        self.assertEqual(cm.exception.code, 1)
-
-        out = buf.getvalue()
-        self.assertIn("[nix] install: nix profile install", out)
-        self.assertIn("[ERROR] Failed to install Nix flake output 'default' (exit 1)", out)
-
-        install_cmds = self._install_cmds_from_calls(subproc_mock.call_args_list)
-        self.assertEqual(
-            install_cmds,
-            [
-                f"nix profile install {self.repo_dir}#default",
-                f"nix profile install {self.repo_dir}#default",
-            ],
-        )
-
-    def test_nix_flake_run_optional_failure_does_not_raise(self) -> None:
-        """
-        For pkgmgr/package-manager repositories:
-          - 'pkgmgr' output is mandatory
-          - 'default' output is optional
-        Failure of optional output must not raise.
-        """
-        ctx = DummyCtx(identifier="pkgmgr", repo_dir=self.repo_dir)
-        installer = NixFlakeInstaller()
-
-        # pkgmgr success (1 call), default fails (2 calls: attempt + final)
-        install_results = [self._cp(0), self._cp(1), self._cp(1)]
-
-        def fake_subprocess_run(cmd, *args, **kwargs):
-            if isinstance(cmd, str) and cmd.startswith("nix profile list --json"):
-                return self._cp(0, stdout='{"elements": []}', stderr="")
-            if isinstance(cmd, str) and cmd.startswith("nix profile install "):
-                return install_results.pop(0)
-            return self._cp(0)
-
-        buf = io.StringIO()
-        with patch("pkgmgr.actions.install.installers.nix.installer.shutil.which") as which_mock, patch(
-            "pkgmgr.actions.install.installers.nix.installer.os.path.exists", return_value=True
-        ), patch(
-            "pkgmgr.actions.install.installers.nix.runner.subprocess.run", side_effect=fake_subprocess_run
-        ) as subproc_mock, redirect_stdout(buf):
-            self._enable_nix_in_module(which_mock)
-
-            self.assertTrue(installer.supports(ctx))
-            installer.run(ctx)  # must NOT raise
-
-        out = buf.getvalue()
-
-        # Should announce both outputs
-        self.assertIn("ensuring outputs: pkgmgr, default", out)
-
-        # First output ok
-        self.assertIn("[nix] output 'pkgmgr' successfully installed.", out)
-
-        # Second output failed but no raise
-        self.assertIn("[ERROR] Failed to install Nix flake output 'default' (exit 1)", out)
-        self.assertIn("[WARNING] Continuing despite failure of optional output 'default'.", out)
-
-        install_cmds = self._install_cmds_from_calls(subproc_mock.call_args_list)
-        self.assertEqual(
-            install_cmds,
-            [
-                f"nix profile install {self.repo_dir}#pkgmgr",
-                f"nix profile install {self.repo_dir}#default",
-                f"nix profile install {self.repo_dir}#default",
-            ],
-        )
-
+        
     def test_nix_flake_supports_respects_disable_env(self) -> None:
         """
         PKGMGR_DISABLE_NIX_FLAKE_INSTALLER=1 must disable the installer,