Minor improvements in testing

Author: gmou3

src/sage/matroids/flats_matroid.pyx

@@ -150,9 +150,9 @@ cdef class FlatsMatroid(Matroid):
         EXAMPLES::
 
             sage: from sage.matroids.flats_matroid import FlatsMatroid
-            sage: M = FlatsMatroid(matroids.Theta(7))
+            sage: M = FlatsMatroid(matroids.Theta(6))
             sage: M.full_rank()
-            7
+            6
         """
         return self._matroid_rank
 
@@ -410,6 +410,12 @@ cdef class FlatsMatroid(Matroid):
             sage: M = FlatsMatroid(matroids.catalog.XY13())
             sage: M.whitney_numbers2()
             [1, 13, 78, 250, 394, 191, 1]
+
+        TESTS::
+
+            sage: from sage.matroids.flats_matroid import FlatsMatroid
+            sage: for M in matroids.AllMatroids(4):  # optional - matroid_database
+            ....:     assert M.whitney_numbers2() == FlatsMatroid(M).whitney_numbers2()
         """
         cdef list W = []
         cdef int i