diff --git a/test/conftest.py b/test/conftest.py
index e5ab2a0..aae96dd 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -212,6 +212,45 @@ def generate_query_and_status(params) -> list[tuple[str, int]]:
 	return query_and_status
 
 
+def generate_body_and_status(params: dict[str, str]) -> list[tuple[dict, int]]:
+	possible_values_int = [0, -1, 42, "banana", ""]
+	possible_values_str = [0]
+
+	defaults = [{param: 1 for param in params.keys()}]
+
+	# Missing params
+	body_list = [
+		{key: ("valid string" if params[key] == "str" else 1) for key in combo}
+		for r in range(len(defaults[0].keys()) + 1)
+		for combo in combinations(defaults[0].keys(), r)
+	]
+
+	# Complete body as default for generating invalid checks
+	default_body = body_list.pop(-1)
+
+	# Generates checks for each param being invalid
+	for param, typ in params.items():
+		if typ == "int":
+			possible_values = possible_values_int
+		elif typ == "str":
+			possible_values = possible_values_str
+		else:
+			raise TypeError(f"Unknown type {typ}")
+		for value in possible_values:
+			new_record = default_body.copy()
+			new_record[param] = value
+			body_list.append(new_record)
+
+	body_and_status = []
+
+	# Assign expected status
+	for body in body_list:
+		# ID 42 is used to represent a non-existent entry. So it should 404.
+		status = 404 if 42 in body.values() else 422
+		body_and_status.append((body, status))
+	return body_and_status
+
+
 def get_testable_routes():
 	routes = []
 
diff --git a/test/test_iam.py b/test/test_iam.py
index 03b4548..d879b26 100644
--- a/test/test_iam.py
+++ b/test/test_iam.py
@@ -3,8 +3,7 @@
 import pytest
 from httpx import AsyncClient
 
-from .conftest import generate_query_and_status
-
+from .conftest import generate_query_and_status, generate_body_and_status
 
 pytestmark = [
 	pytest.mark.iam_module,
@@ -259,32 +258,7 @@ async def test_post_group_success(default_client: AsyncClient):
 
 @pytest.mark.parametrize(
 	"body, expected_status",
-	[
-		({"organisation_id": 1, "name": "Org One Group"}, 409),
-		(
-			{"organisation_id": 42, "name": "new group"},
-			404,
-		),  # Non-existent organisation, valid name
-		(
-			{"organisation_id": "banana", "name": "new group"},
-			422,
-		),  # Invalid organisation ID, valid name
-		(
-			{"organisation_id": "", "name": "new group"},
-			422,
-		),  # Blank organisation ID, valid name
-		(
-			{"organisation_id": -1, "name": "new group"},
-			422,
-		),  # Negative organisation ID, valid name
-		({"name": 1}, 422),  # Only name
-		({}, 422),  # Blank body
-		({"organisation_id": "", "name": ""}, 422),  # Both blank
-		({"organisation_id": 1, "name": 42}, 422),  # Valid organisation, invalid name
-		({"organisation_id": 1, "name": ""}, 422),  # Valid organisation, blank name
-		({"organisation_id": 1, "name": "hi"}, 422),  # Valid organisation, small name
-		({"organisation_id": 1}, 422),  # Only organisation ID
-	],
+	generate_body_and_status({"organisation_id": "int", "name": "str"}),
 )
 @pytest.mark.anyio
 async def test_post_group_status_checks(
@@ -295,6 +269,15 @@ async def test_post_group_status_checks(
 	assert resp.status_code == expected_status
 
 
+@pytest.mark.anyio
+async def test_post_group_conflict(default_client: AsyncClient):
+	resp = await default_client.post(
+		"/iam/group", json={"organisation_id": 1, "name": "Org One Group"}
+	)
+
+	assert resp.status_code == 409
+
+
 @pytest.mark.anyio
 async def test_put_group_perm_success(default_client: AsyncClient):
 	resp = await default_client.put(
@@ -322,67 +305,9 @@ async def test_put_group_perm_success(default_client: AsyncClient):
 
 @pytest.mark.parametrize(
 	"body, expected_status",
-	[
-		(
-			{"organisation_id": 42, "group_id": 1, "permission_id": 1},
-			404,
-		),  # Non-existent organisation
-		(
-			{"organisation_id": "banana", "group_id": 1, "permission_id": 1},
-			422,
-		),  # Invalid organisation ID
-		(
-			{"organisation_id": "", "group_id": 1, "permission_id": 1},
-			422,
-		),  # Blank organisation ID
-		(
-			{"organisation_id": -1, "group_id": 1, "permission_id": 1},
-			422,
-		),  # Negative organisation ID
-		(
-			{"organisation_id": 1, "group_id": 42, "permission_id": 1},
-			404,
-		),  # Non-existent group
-		(
-			{"organisation_id": 1, "group_id": "banana", "permission_id": 1},
-			422,
-		),  # Invalid group ID
-		(
-			{"organisation_id": 1, "group_id": "", "permission_id": 1},
-			422,
-		),  # Blank group ID
-		(
-			{"organisation_id": 1, "group_id": -1, "permission_id": 1},
-			422,
-		),  # Negative group ID
-		(
-			{"organisation_id": 1, "group_id": 1, "permission_id": 42},
-			404,
-		),  # Non-existent permission
-		(
-			{"organisation_id": 1, "group_id": 1, "permission_id": "banana"},
-			422,
-		),  # Invalid permission ID
-		(
-			{"organisation_id": 1, "group_id": 1, "permission_id": ""},
-			422,
-		),  # Blank permission ID
-		(
-			{"organisation_id": 1, "group_id": 1, "permission_id": -1},
-			422,
-		),  # Negative permission ID
-		({}, 422),  # Blank body
-		({"permission_id": 1}, 422),  # Only permission
-		({"organisation_id": 1}, 422),  # Only organisation
-		({"group_id": 1}, 422),  # Only group
-		({"organisation_id": 1, "permission_id": 1}, 422),  # Missing group
-		({"group_id": 1, "permission_id": 1}, 422),  # Missing organisation
-		({"organisation_id": 1, "group_id": 1}, 422),  # Missing permission
-		(
-			{"organisation_id": 1, "group_id": 1, "permission_id": 1},
-			409,
-		),  # Permission already in group
-	],
+	generate_body_and_status(
+		{"organisation_id": "int", "group_id": "int", "permission_id": "int"}
+	),
 )
 @pytest.mark.anyio
 async def test_put_group_perm_status_checks(
@@ -393,6 +318,16 @@ async def test_put_group_perm_status_checks(
 	assert resp.status_code == expected_status
 
 
+@pytest.mark.anyio
+async def test_put_group_perm_conflict(default_client: AsyncClient):
+	resp = await default_client.put(
+		"/iam/group/permission",
+		json={"organisation_id": 1, "group_id": 1, "permission_id": 1},
+	)
+
+	assert resp.status_code == 409
+
+
 @pytest.mark.parametrize(
 	"body",
 	[
@@ -434,54 +369,9 @@ async def test_put_group_user_success(default_client: AsyncClient):
 
 @pytest.mark.parametrize(
 	"body, expected_status",
-	[
-		(
-			{"organisation_id": 42, "group_id": 1, "user_id": 1},
-			404,
-		),  # Non-existent organisation
-		(
-			{"organisation_id": "banana", "group_id": 1, "user_id": 1},
-			422,
-		),  # Invalid organisation ID
-		(
-			{"organisation_id": "", "group_id": 1, "user_id": 1},
-			422,
-		),  # Blank organisation ID
-		(
-			{"organisation_id": -1, "group_id": 1, "user_id": 1},
-			422,
-		),  # Negative organisation ID
-		(
-			{"organisation_id": 1, "group_id": 42, "user_id": 1},
-			404,
-		),  # Non-existent group
-		(
-			{"organisation_id": 1, "group_id": "banana", "user_id": 1},
-			422,
-		),  # Invalid group ID
-		({"organisation_id": 1, "group_id": "", "user_id": 1}, 422),  # Blank group ID
-		(
-			{"organisation_id": 1, "group_id": -1, "user_id": 1},
-			422,
-		),  # Negative group ID
-		(
-			{"organisation_id": 1, "group_id": 1, "user_id": 42},
-			404,
-		),  # Non-existent user
-		(
-			{"organisation_id": 1, "group_id": 1, "user_id": "banana"},
-			422,
-		),  # Invalid user ID
-		({"organisation_id": 1, "group_id": 1, "user_id": ""}, 422),  # Blank user ID
-		({"organisation_id": 1, "group_id": 1, "user_id": -1}, 422),  # Negative user ID
-		({}, 422),  # Blank body
-		({"user_id": 1}, 422),  # Only user
-		({"organisation_id": 1}, 422),  # Only organisation
-		({"group_id": 1}, 422),  # Only group
-		({"organisation_id": 1, "user_id": 1}, 422),  # Missing group
-		({"group_id": 1, "user_id": 1}, 422),  # Missing organisation
-		({"organisation_id": 1, "group_id": 1}, 422),  # Missing user
-	],
+	generate_body_and_status(
+		{"organisation_id": "int", "group_id": "int", "user_id": "int"}
+	),
 )
 @pytest.mark.anyio
 async def test_put_group_user_status_checks(
diff --git a/test/test_service.py b/test/test_service.py
index 0114748..b874a89 100644
--- a/test/test_service.py
+++ b/test/test_service.py
@@ -5,8 +5,7 @@
 import pytest
 from httpx import AsyncClient
 
-from .conftest import generate_query_and_status
-
+from .conftest import generate_query_and_status, generate_body_and_status
 
 pytestmark = [
 	pytest.mark.service_module,
@@ -51,12 +50,7 @@ async def test_post_service_success(default_client: AsyncClient):
 
 
 @pytest.mark.parametrize(
-	"body, expected_status",
-	[
-		({"name": "Test Service"}, 409),
-		({"name": 42}, 422),
-		({}, 422),
-	],
+	"body, expected_status", generate_body_and_status({"name": "str"})
 )
 @pytest.mark.anyio
 async def test_post_service_status_checks(
@@ -67,6 +61,13 @@ async def test_post_service_status_checks(
 	assert resp.status_code == expected_status
 
 
+@pytest.mark.anyio
+async def test_post_service_conflict(default_client: AsyncClient):
+	resp = await default_client.post("/service", json={"name": "Test Service"})
+
+	assert resp.status_code == 409
+
+
 @pytest.mark.anyio
 async def test_patch_service_success(default_client: AsyncClient):
 	resp = await default_client.patch("/service/key", json={"service_id": 1})
@@ -82,12 +83,7 @@ async def test_patch_service_success(default_client: AsyncClient):
 
 @pytest.mark.parametrize(
 	"body, expected_status",
-	[
-		({"service_id": 42}, 404),
-		({"service_id": "Test Service"}, 422),
-		({"service_id": ""}, 422),
-		({}, 422),
-	],
+	generate_body_and_status({"service_id": "int"}),
 )
 @pytest.mark.anyio
 async def test_patch_services_status_checks(