Add missing test guards.

Author: lohedges

tests/Align/test_align.py

@@ -929,6 +929,10 @@ def test_ring_breaking_intrascale():
     assert len(omm_rev.changed_exceptions()) == len(ref_exceptions)
 
 
+@pytest.mark.skipif(
+    not has_antechamber or not has_tleap,
+    reason="Requires antechamber and tLEaP to be installed.",
+)
 @pytest.mark.skipif(
     not has_openff,
     reason="Requires OpenFF to be installed.",