fix: skip empty policy bindings in `len()` and `iter()` (#159)

Exclude empty policy bindings (bindings with no members) in
`Policy.__iter__()` and `Policy.__len__()`

Follow up to #155 

1 files changed, 5 insertions, 5 deletions

diff --git a/tests/unit/test_iam.py b/tests/unit/test_iam.py
index f9771f0..0da9b23 100644
--- a/tests/unit/test_iam.py
+++ b/tests/unit/test_iam.py
@@ -32,11 +32,11 @@ class TestPolicy:
         policy = self._make_one()
         assert policy.etag is None
         assert policy.version is None
-        assert len(policy) == 0
-        assert dict(policy) == {}
         assert policy.owners == empty
         assert policy.editors == empty
         assert policy.viewers == empty
+        assert len(policy) == 0
+        assert dict(policy) == {}
 
     def test_ctor_explicit(self):
         VERSION = 1
@@ -45,11 +45,11 @@ class TestPolicy:
         policy = self._make_one(ETAG, VERSION)
         assert policy.etag == ETAG
         assert policy.version == VERSION
-        assert len(policy) == 0
-        assert dict(policy) == {}
         assert policy.owners == empty
         assert policy.editors == empty
         assert policy.viewers == empty
+        assert len(policy) == 0
+        assert dict(policy) == {}
 
     def test___getitem___miss(self):
         policy = self._make_one()
@@ -301,10 +301,10 @@ class TestPolicy:
         policy = klass.from_api_repr(RESOURCE)
         assert policy.etag == "ACAB"
         assert policy.version is None
-        assert dict(policy) == {}
         assert policy.owners == empty
         assert policy.editors == empty
         assert policy.viewers == empty
+        assert dict(policy) == {}
 
     def test_from_api_repr_complete(self):
         from google.api_core.iam import OWNER_ROLE, EDITOR_ROLE, VIEWER_ROLE