refactor: testing

Redid testing structure, added tests and changed some tests.

ref: N25B-301

test/unit/schemas/test_ri_message.py

@@ -0,0 +1,26 @@
+import pytest
+from pydantic import ValidationError
+
+from control_backend.schemas.ri_message import RIEndpoint, RIMessage, SpeechCommand
+
+
+def valid_command_1():
+    return SpeechCommand(data="Hallo?")
+
+
+def invalid_command_1():
+    return RIMessage(endpoint=RIEndpoint.PING, data="Hello again.")
+
+
+def test_valid_speech_command_1():
+    command = valid_command_1()
+    RIMessage.model_validate(command)
+    SpeechCommand.model_validate(command)
+
+
+def test_invalid_speech_command_1():
+    command = invalid_command_1()
+    RIMessage.model_validate(command)
+
+    with pytest.raises(ValidationError):
+        SpeechCommand.model_validate(command)