diff --git a/tests/test_thread.py b/tests/test_thread.py
new file mode 100644
index 0000000..baea7ad
--- /dev/null
+++ b/tests/test_thread.py
@@ -0,0 +1,65 @@
+import pytest
+import fbchat
+from fbchat._thread import ThreadType, ThreadColor, Thread
+
+
+def test_thread_type_to_class():
+    assert fbchat.User == ThreadType.USER._to_class()
+    assert fbchat.Group == ThreadType.GROUP._to_class()
+    assert fbchat.Page == ThreadType.PAGE._to_class()
+
+
+def test_thread_color_from_graphql():
+    assert None is ThreadColor._from_graphql(None)
+    assert ThreadColor.MESSENGER_BLUE is ThreadColor._from_graphql("")
+    assert ThreadColor.VIKING is ThreadColor._from_graphql("FF44BEC7")
+    assert ThreadColor._from_graphql("DEADBEEF") is getattr(
+        ThreadColor, "UNKNOWN_#ADBEEF"
+    )
+
+
+def test_thread_parse_customization_info_empty():
+    assert {} == Thread._parse_customization_info(None)
+    assert {} == Thread._parse_customization_info({"customization_info": None})
+
+
+def test_thread_parse_customization_info_group():
+    data = {
+        "thread_key": {"thread_fbid": "11111", "other_user_id": None},
+        "customization_info": {
+            "emoji": "🎉",
+            "participant_customizations": [
+                {"participant_id": "123456789", "nickname": "A"},
+                {"participant_id": "987654321", "nickname": "B"},
+            ],
+            "outgoing_bubble_color": "FFFF5CA1",
+        },
+        "customization_enabled": True,
+        "thread_type": "GROUP",
+        # ... Other irrelevant fields
+    }
+    expected = {
+        "emoji": "🎉",
+        "color": ThreadColor.BRILLIANT_ROSE,
+        "nicknames": {"123456789": "A", "987654321": "B"},
+    }
+    assert expected == Thread._parse_customization_info(data)
+
+
+def test_thread_parse_customization_info_user():
+    data = {
+        "thread_key": {"thread_fbid": None, "other_user_id": "987654321"},
+        "customization_info": {
+            "emoji": None,
+            "participant_customizations": [
+                {"participant_id": "123456789", "nickname": "A"},
+                {"participant_id": "987654321", "nickname": "B"},
+            ],
+            "outgoing_bubble_color": None,
+        },
+        "customization_enabled": True,
+        "thread_type": "ONE_TO_ONE",
+        # ... Other irrelevant fields
+    }
+    expected = {"emoji": None, "color": None, "own_nickname": "A", "nickname": "B"}
+    assert expected == Thread._parse_customization_info(data)