Test BDFM (#4866)

Author: pbrubeck

tests/firedrake/regression/test_bubble.py

@@ -44,6 +44,5 @@ def test_BDFM():
     a = out.dat.data
     a.sort()
     assert (abs(a[1:7]) < 1e-12).all()
-    assert abs(a[0] + 6.75) < 1e-12
-    assert abs(a[7] - 6.75) < 1e-12
-    assert abs(a[8] - 13.5) < 1e-12
+    assert abs(a[7] + a[0]) < 1e-12
+    assert abs(a[8] + a[0]) < 1e-12