refactor: conftest: Generate msg templates from factory function.

This commit adds a new function msg_template_factory that can generate
templates for all message types, i.e. stream/PM/group with minimum
input parameters.

This new factory simplifies the code and reduces duplication in tests.
All the different message template functions are defined as fixtures
so that they can be reused throughout the tests. This new factory also
makes it easy to create a large number of output templates with minimal
modification of the input.

Author: zee-bit

tests/conftest.py

@@ -1,6 +1,6 @@
 from collections import OrderedDict, defaultdict
 from copy import deepcopy
-from typing import Any, Dict, List, Tuple
+from typing import Any, Dict, List, Optional, Tuple, Union
 
 import pytest
 
@@ -289,85 +289,80 @@ def display_recipient_factory(recipient_details_list: List[Tuple[int, str]]):
     ]
 
 
-stream_msg_template = {
-    "id": 537286,
-    "sender_full_name": "Foo Foo",
-    "timestamp": 1520918722,
-    "client": "website",
-    "sender_email": "[email protected]",
-    "type": "stream",
-    "sender_realm_str": "",
-    "flags": ["read"],
-    "sender_id": 5140,
-    "content_type": "text/x-markdown",
-    "stream_id": 205,
-    "subject": "Test",
-    "reactions": [],
-    "subject_links": [],
-    "avatar_url": "dummy_avatar_url",
-    "is_me_message": False,
-    "content": "Stream content here.",
-    "display_recipient": "PTEST",
-}
+def msg_template_factory(
+    msg_id: int,
+    msg_type: str,
+    timestamp: int,
+    *,
+    subject: str = "",
+    stream_id: Optional[int] = None,
+    recipients: Union[str, List[Dict[str, Any]]] = "PTEST",
+):
+    """
+    Generate message template for all types of messages(stream/PM/group)
+    """
+    return {
+        "id": msg_id,
+        "sender_full_name": "Foo Foo",
+        "timestamp": timestamp,
+        "client": "website",
+        "sender_email": "[email protected]",
+        "type": msg_type,
+        "sender_realm_str": "",
+        "flags": ["read"],
+        "sender_id": 5140,
+        "content_type": "text/x-markdown",
+        "stream_id": stream_id,
+        "subject": subject,
+        "reactions": [],
+        "subject_links": [],
+        "avatar_url": "dummy_avatar_url",
+        "is_me_message": False,
+        "content": f"{msg_type} content here.",
+        "display_recipient": recipients,
+    }
 
-pm_template = {
-    "id": 537287,
-    "sender_full_name": "Foo Foo",
-    "timestamp": 1520918736,
-    "client": "website",
-    "is_me_message": False,
-    "sender_email": "[email protected]",
-    "flags": ["read"],
-    "sender_id": 5140,
-    "content_type": "text/x-markdown",
-    "sender_realm_str": "",
-    "subject": "",
-    "reactions": [],
-    "type": "private",
-    "avatar_url": "dummy_avatar_url",
-    "subject_links": [],
-    "content": "Hey PM content here.",
-    "display_recipient": display_recipient_factory(
-        [(5179, "Boo Boo"), (5140, "Foo Foo")]
-    ),
-}
 
-group_pm_template = {
-    "id": 537288,
-    "sender_full_name": "Foo Foo",
-    "timestamp": 1520918737,
-    "client": "website",
-    "is_me_message": False,
-    "sender_email": "[email protected]",
-    "flags": ["read"],
-    "sender_id": 5140,
-    "content_type": "text/x-markdown",
-    "sender_realm_str": "",
-    "subject": "",
-    "reactions": [],
-    "type": "private",
-    "avatar_url": "dummy_avatar_url",
-    "subject_links": [],
-    "content": "Hey PM content here again.",
-    "display_recipient": display_recipient_factory(
+@pytest.fixture
+def stream_msg_template():
+    msg_template = msg_template_factory(
+        537286, "stream", 1520918722, subject="PTEST", stream_id=205)
+    msg_template["subject"] = "Test"
+    return msg_template
+
+
+@pytest.fixture
+def pm_template():
+    recipients = display_recipient_factory([(5179, "Boo Boo"), (5140, "Foo Foo")])
+    return msg_template_factory(537287, "private", 1520918736, recipients=recipients)
+
+
+@pytest.fixture
+def group_pm_template():
+    recipients = display_recipient_factory(
         [(5179, "Boo Boo"), (5140, "Foo Foo"), (5180, "Bar Bar")]
-    ),
-}
+    )
+    return msg_template_factory(537288, "private", 1520918737, recipients=recipients)
 
 
 @pytest.fixture(
-    params=[stream_msg_template, pm_template, group_pm_template],
+    params=["stream_msg_template", "pm_template", "group_pm_template"],
     ids=["stream_message", "pm_message", "group_pm_message"],
 )
 def message_fixture(request):
     """
     Acts as a parametrize fixture for stream msg, pms and group_pms.
     """
-    return deepcopy(request.param)
+    template = request.getfixturevalue(request.param)
+    return template
 
 
 @pytest.fixture
-def messages_successful_response() -> Dict[str, Any]:
+def messages_successful_response(
+    stream_msg_template,
+    pm_template,
+    group_pm_template,
+) -> Dict[str, Any]:
     """
     A successful response from a /messages API query.
     """
@@ -640,7 +635,7 @@ def initial_index():
 
 
 @pytest.fixture
-def empty_index():
+def empty_index(stream_msg_template, pm_template, group_pm_template):
     return deepcopy(
         {
             "pointer": defaultdict(set, {}),