Test for ELB with 0 instances attached (#300)

Author: ajvb

aws/elb/test_elb_instances_attached.py

@@ -0,0 +1,15 @@
+import pytest
+
+from aws.elb.resources import elbs
+
+
+@pytest.mark.elb
+@pytest.mark.parametrize(
+    "elb", elbs(), ids=lambda e: e["LoadBalancerName"],
+)
+def test_elb_instances_attached(elb):
+    """
+    Checks to see that an ELB has attached instances and fails if
+    there are 0
+    """
+    assert len(elb["Instances"]) > 0, "ELB has zero attached instances"