fix: solve error for running tests without Zulip API Key (#102)

Closes #82

.github/workflows/tests.yml

@@ -37,9 +37,6 @@ jobs:
         python -m pip install --upgrade pip
         pip install -r requirements.txt
         pip install coverage==5.4
-    
-    - name: Creating Zulip API key
-      run: echo -e "${{ secrets.ZULIP_API_KEY }}" >> download
 
     - name: Exporting Secret Key
       run: echo -e "SECRET_KEY=${{ secrets.SECRET_KEY }}" >> .env

osp/utils/zulip_api.py

@@ -2,7 +2,10 @@
 
 # By default the API key file you download is named as 'download' by Zulip. You can place
 # this file one directory previous to the cuurent directory your file is in
-client = Client(config_file="download")
+
+
+def get_client():
+    return Client(config_file="download")
 
 def get_self_zulip_id():
     result =  client.get_profile()
@@ -18,6 +21,7 @@ def get_zulip_user(zulip_id: int) -> dict:
             {"avatar_url": "...","bot_type": null,... "profile_data":...}
     """
 
+    client = get_client()
     result = client.get_user_by_id(zulip_id)
     print(result)
     return result["user"]
@@ -34,6 +38,7 @@ def get_total_messages_count(zulip_id: int) -> int:
             10
     """
 
+    client = get_client()
     request = {
         "anchor": "newest",
         "num_before": 5000,
@@ -55,6 +60,7 @@ def get_newest_message(zulip_id: int) -> dict:
             {"avatar_url": ...,"bot_type": null, ..., "profile_data":...}
     """
 
+    client = get_client()
     request = {
         "anchor": "newest",
         "num_before": 1,
@@ -76,6 +82,7 @@ def get_stream_messages_count(stream: str, zulip_id: int) -> int:
             10
     """
 
+    client = get_client()
     request = {
         "anchor": "newest",
         "num_before": 1,