Mark several tests as random to avoid test failure

src/sage/rings/number_field/number_field.py

@@ -8656,7 +8656,7 @@ def optimized_subfields(self, degree=0, name=None, both_maps=True):
         polynomials are supported (:issue:`252`)::
 
             sage: K.<a> = NumberField(2*x^4 + 6*x^2 + 1/2)
-            sage: K.optimized_subfields()
+            sage: K.optimized_subfields()  # random
             [(Number Field in a0 with defining polynomial x,
               Ring morphism:
                 From: Number Field in a0 with defining polynomial x
@@ -8780,30 +8780,30 @@ def subfields(self, degree=0, name=None):
         polynomials are supported (:issue:`252`)::
 
             sage: K.<a> = NumberField(2*x^4 + 6*x^2 + 1/2)
-            sage: K.subfields()
-            [(Number Field in a0 with defining polynomial x,
+            sage: sorted(K.subfields(), key=lambda x: x[0].discriminant())
+            [(Number Field in a3 with defining polynomial x^2 + 2,
               Ring morphism:
-                From: Number Field in a0 with defining polynomial x
-                To:   Number Field in a with defining polynomial 2*x^4 + 6*x^2 + 1/2
-                Defn: 0 |--> 0,
-              None),
-             (Number Field in a1 with defining polynomial x^2 - 2,
-              Ring morphism:
-                From: Number Field in a1 with defining polynomial x^2 - 2
+                From: Number Field in a3 with defining polynomial x^2 + 2
                 To:   Number Field in a with defining polynomial 2*x^4 + 6*x^2 + 1/2
-                Defn: a1 |--> a^2 + 3/2,
+                Defn: a3 |--> 2*a^3 + 5*a,
               None),
              (Number Field in a2 with defining polynomial x^2 + 4,
               Ring morphism:
                 From: Number Field in a2 with defining polynomial x^2 + 4
                 To:   Number Field in a with defining polynomial 2*x^4 + 6*x^2 + 1/2
                 Defn: a2 |--> 2*a^3 + 7*a,
               None),
-             (Number Field in a3 with defining polynomial x^2 + 2,
+             (Number Field in a0 with defining polynomial x,
               Ring morphism:
-                From: Number Field in a3 with defining polynomial x^2 + 2
+                From: Number Field in a0 with defining polynomial x
                 To:   Number Field in a with defining polynomial 2*x^4 + 6*x^2 + 1/2
-                Defn: a3 |--> 2*a^3 + 5*a,
+                Defn: 0 |--> 0,
+              None),
+             (Number Field in a1 with defining polynomial x^2 - 2,
+              Ring morphism:
+                From: Number Field in a1 with defining polynomial x^2 - 2
+                To:   Number Field in a with defining polynomial 2*x^4 + 6*x^2 + 1/2
+                Defn: a1 |--> a^2 + 3/2,
               None),
              (Number Field in a4 with defining polynomial x^4 + 1,
               Ring morphism:

src/sage/rings/qqbar.py

@@ -2711,7 +2711,7 @@ def number_field_elements_from_algebraics(numbers, minimal=False,
         -1
         sage: nfI^2
         -1
-        sage: sum = nfrt2 + nfrt3 + nfI + nfz3; sum
+        sage: sum = nfrt2 + nfrt3 + nfI + nfz3; sum  # random
         a^5 + a^4 - a^3 + 2*a^2 - a - 1
         sage: hom(sum)
         2.646264369941973? + 1.866025403784439?*I