tests: migrate misc.sh

note: only two of the tests actually needed migrating, as the others
were already covered (e.g. by lang)

Change-Id: I30abb2bd728ae2b144ad76566096a216aed3b8f8

tests/functional2/cli/test_env.py

@@ -0,0 +1,15 @@
+from testlib.fixtures.nix import Nix
+import pytest
+
+
+pytestmark = pytest.mark.no_daemon
+
+
+def test_no_op(nix: Nix):
+    res = nix.nix_env(["--foo"]).run().expect(1)
+    assert "no operation" in res.stderr_plain
+
+
+def test_unknown_flag(nix: Nix):
+    res = nix.nix_env(["-q", "--foo"]).run().expect(1)
+    assert "unknown flag" in res.stderr_plain