Fix repr sorting issue and add some small tests

src/sage/algebras/clifford_algebra.py

@@ -180,7 +180,7 @@ def list(self):
             sage: elt.list()
             [(1, 5), (01, 1)]
         """
-        return sorted(self._monomial_coefficients.items(), key=lambda m_c : (-len(m_c[0]), m_c))
+        return sorted(self._monomial_coefficients.items(), key=lambda m : (-len(m[0]), list(m[0])))
 
     def support(self):
         """
@@ -197,7 +197,7 @@ def support(self):
             sage: elt.support()
             [1, 01]
         """
-        return sorted(self._monomial_coefficients.keys(), key=lambda x: (-len(x), x))
+        return sorted(self._monomial_coefficients.keys(), key=lambda x: (-len(x), list(x)))
 
     def reflection(self):
         r"""
@@ -545,8 +545,7 @@ def __init__(self, Q, names, category=None):
             sage: Q = QuadraticForm(ZZ, 9)
             sage: Cl = CliffordAlgebra(Q)
             sage: ba = Cl.basis().keys()
-            sage: all( tuple(sorted(S)) in ba
-            ....:      for S in Subsets(range(9)) )
+            sage: all(FrozenBitset(format(i,'b')[::-1]) in ba for i in range(2**9))
             True
         """
         self._quadratic_form = Q
@@ -583,6 +582,8 @@ def _repr_term(self, m):
             sage: Cl.<x,y,z> = CliffordAlgebra(Q)
             sage: Cl._repr_term((0,2))
             'x*z'
+            sage: Cl._repr_term(FrozenBitset('101'))
+            'x*z'
             sage: Cl._repr_term(())
             '1'
             sage: Cl._repr_term((1,))