Rewrite tests while keeping 97% cov

tests/test_engine/test_engine_init.py

@@ -0,0 +1,18 @@
+import pytest
+from searchbox.engine import UnknownEngineError, get_engine
+from searchbox.engine.qdrant_engine import QdrantEngine
+
+
+def test_get_qdrant_engine():
+    engine = get_engine("qdrant")
+    assert isinstance(engine, QdrantEngine)
+
+
+def test_get_qdrant_engine_with_kwargs():
+    engine = get_engine("qdrant", url="http://localhost:6333", api_key=None)
+    assert isinstance(engine, QdrantEngine)
+
+
+def test_get_unknown_engine():
+    with pytest.raises(UnknownEngineError):
+        get_engine("unknown") # type: ignore[reportCallArgs]