Feat: add unhappy path test for post student

tests/e2e/test_api.py

@@ -74,15 +74,35 @@ def test_api_post_student():
 
 @pytest.mark.usefixtures("restart_api")
 @pytest.mark.usefixtures("clean_db")
-def test_api_post_student():
+def test_api_post_student_with_id():
     url = config.get_api_url()
     tribe = build_tribes(1)[0]
     requests.post(f"{url}/tribes", json=tribe.to_dict())
 
-    data = {"name": "zart", "tribe_name": tribe.name}
+    data = {"id": "1234", "name": "zart", "tribe_name": tribe.name}
+    requests.post(f"{url}/students", json=data)
     r = requests.post(f"{url}/students", json=data)
 
-    assert r.status_code == 201
-    assert r.json()["name"] == "zart"
-    assert r.json()["tribe_name"] == tribe.name
-    assert r.json()["id"]
+    assert r.status_code == 409
+    assert (
+        r.json()
+        == f"You can't post a student with an id. It is already registrered. Use PUT to modify it."
+    )
+
+
+@pytest.mark.usefixtures("restart_api")
+@pytest.mark.usefixtures("clean_db")
+def test_api_post_student_in_non_existant_tribe():
+    url = config.get_api_url()
+    tribe = build_tribes(1)[0]
+    requests.post(f"{url}/tribes", json=tribe.to_dict())
+
+    data = {"name": "zart", "tribe_name": tribe.name + "_"}
+    requests.post(f"{url}/students", json=data)
+    r = requests.post(f"{url}/students", json=data)
+
+    assert r.status_code == 409
+    assert (
+        r.json()
+        == f"The tribe {tribe.name+'_'} does not exists. You can't add a student in it."
+    )