Addded logic to check whether a collection exists.

src/msmongoclient.py

@@ -42,9 +42,19 @@ def find(self, collection_name, query):
 
   def delete_many(self, collection_name, query):
     return self.client[collection_name].delete_many(query)
+
+  def exists_collection(self, collection_name):
+    return collection_name in self.collection_names()
+
+  @cache
+  def collection_names(self):
+    return self.client.list_collection_names()
 
 def test_insert_one():
   client = MSMongoClient.singleton 
   client.insert_one("users", { "name": "Moctezuma" })
   entry = client.find_one("users", {})
-  assert(entry["name"] == "Moctezuma")
+  assert(entry["name"] == "Moctezuma")
+
+def test_exists_collection():
+  assert(MSMongoClient.singleton.exists_collection("SoccerEvent") == True)