Add some tests for a when clause based on an enum of names

The new tests, test the handling of a when clause based on an
enum with string values. The code should translate the enum name string
into the internal database numeric value for the enum so the comparison
works.

tests/test_create.py

@@ -633,6 +633,47 @@ def test_restconf_when_condition_false():
     """)
 
 
+def test_restconf_when_condition_translate_true():
+    tree = """
+{
+    "cage": [
+        "box"
+    ]
+}
+"""
+    response = requests.post("{}{}/data/test/animals/animal/cat/cages".format(server_uri, docroot),
+                             auth=server_auth, headers=set_restconf_headers, data=tree)
+    assert response.status_code == 201
+    assert len(response.content) == 0
+    assert apteryx.get("/test/animals/animal/cat/cages/cage/box") == "box"
+
+
+def test_restconf_when_condition_translate_false():
+    tree = """
+{
+    "cage": [
+        "box"
+    ]
+}
+"""
+    response = requests.post("{}{}/data/test/animals/animal/mouse/cages".format(server_uri, docroot),
+                             auth=server_auth, headers=set_restconf_headers, data=tree)
+    assert response.status_code == 404
+    assert response.json() == json.loads("""
+{
+    "ietf-restconf:errors" : {
+        "error" : [
+        {
+            "error-message": "uri path not found",
+            "error-type" : "application",
+            "error-tag" : "invalid-value"
+        }
+        ]
+    }
+}
+    """)
+
+
 def test_restconf_must_condition_true():
     data = """{"friend": "ben"}"""
     response = requests.post("{}{}/data/test/animals/animal/dog".format(server_uri, docroot),