Fix last missing coverage in main.py

tests/test_inverters.py

@@ -27,6 +27,14 @@ def test_post_inverters_for_site(client, sites, httpx_mock):
     assert response.json()["inverters"][0]["id"] == test_inverter_client_id
 
 
+def test_post_inverters_for_nonexistant_site(client, sites):
+    nonexistant_site_uuid = "1cd11139-790a-46c0-8849-0c7c8e810ba5"
+    test_inverter_client_id = "6c078ca2-2e75-40c8-9a7f-288bd0b70065"
+    json = [test_inverter_client_id]
+    response = client.post(f"/sites/{nonexistant_site_uuid}/inverters", json=json)
+    assert response.status_code == 404
+
+
 def test_get_inverters_for_site_fake(client, sites, inverters, fake):
     response = client.get(f"/sites/{sites[0].site_uuid}/inverters")
     assert response.status_code == 200