Merge branch 'fixup_assertion' into 'NIFTy_7'

Test for domain equality

See merge request !690

src/extra.py

@@ -136,6 +136,8 @@ def check_operator(op, loc, tol=1e-12, ntries=100, perf_check=True,
 def assert_allclose(f1, f2, atol=0, rtol=1e-7):
     if isinstance(f1, Field):
         return np.testing.assert_allclose(f1.val, f2.val, atol=atol, rtol=rtol)
+    if f1.domain is not f2.domain:
+        raise AssertionError
     for key, val in f1.items():
         assert_allclose(val, f2[key], atol=atol, rtol=rtol)
 
@@ -143,6 +145,8 @@ def assert_allclose(f1, f2, atol=0, rtol=1e-7):
 def assert_equal(f1, f2):
     if isinstance(f1, Field):
         return np.testing.assert_equal(f1.val, f2.val)
+    if f1.domain is not f2.domain:
+        raise AssertionError
     for key, val in f1.items():
         assert_equal(val, f2[key])