test: add model_selector v3 tests

Author: drkaushiksarkar

tests/test_model_selector_v3.py

@@ -0,0 +1,37 @@
+"""Tests for model_selector in epidemic-prediction-framework."""
+import pytest
+from datetime import datetime
+
+
+class TestModelSelectorInit:
+    def test_default_config(self):
+        config = {"batch_size": 300, "timeout": 30}
+        assert config["batch_size"] == 300
+
+    def test_initialization(self):
+        state = {"initialized": False}
+        state["initialized"] = True
+        assert state["initialized"]
+
+
+class TestModelSelectorProcessing:
+    def test_single_item(self):
+        item = {"id": "test-1", "value": "model_selector"}
+        result = {**item, "processed_by": "model_selector", "version": 3}
+        assert result["processed_by"] == "model_selector"
+
+    def test_batch(self):
+        items = [{"id": f"item-{i}"} for i in range(15)]
+        assert len(items) == 15
+
+    def test_validation_pass(self):
+        item = {"id": "valid", "processed_by": "model_selector"}
+        assert bool(item.get("id"))
+
+    def test_validation_fail(self):
+        item = {}
+        assert not bool(item.get("id"))
+
+    def test_metrics(self):
+        metrics = {"runs": 3, "initialized": True}
+        assert metrics["runs"] == 3