diff --git a/tests/test_flake_services_manager.py b/tests/test_flake_services_manager.py
index 73195bf..456c083 100644
--- a/tests/test_flake_services_manager.py
+++ b/tests/test_flake_services_manager.py
@@ -1,26 +1,74 @@
 import pytest
 
-from selfprivacy_api.services.flake_service_manager import FlakeServiceManager
+from selfprivacy_api.services.flake_service_manager import (
+    FlakeServiceManager,
+    FLAKE_CONFIG_PATH,
+)
+
+all_services_file = """
+{
+    description = "SelfPrivacy NixOS PoC modules/extensions/bundles/packages/etc";
+
+
+    inputs.bitwarden.url = git+https://git.selfprivacy.org/SelfPrivacy/selfprivacy-nixos-config.git?ref=flakes&dir=sp-modules/bitwarden;
+
+    inputs.gitea.url = git+https://git.selfprivacy.org/SelfPrivacy/selfprivacy-nixos-config.git?ref=flakes&dir=sp-modules/gitea;
+
+    inputs.jitsi-meet.url = git+https://git.selfprivacy.org/SelfPrivacy/selfprivacy-nixos-config.git?ref=flakes&dir=sp-modules/jitsi-meet;
+
+    inputs.nextcloud.url = git+https://git.selfprivacy.org/SelfPrivacy/selfprivacy-nixos-config.git?ref=flakes&dir=sp-modules/nextcloud;
+
+    inputs.ocserv.url = git+https://git.selfprivacy.org/SelfPrivacy/selfprivacy-nixos-config.git?ref=flakes&dir=sp-modules/ocserv;
+
+    inputs.pleroma.url = git+https://git.selfprivacy.org/SelfPrivacy/selfprivacy-nixos-config.git?ref=flakes&dir=sp-modules/pleroma;
+
+    inputs.simple-nixos-mailserver.url = git+https://git.selfprivacy.org/SelfPrivacy/selfprivacy-nixos-config.git?ref=flakes&dir=sp-modules/simple-nixos-mailserver;
+
+    outputs = _: { };
+}
+"""
+
+
+some_services_file = """
+{
+    description = "SelfPrivacy NixOS PoC modules/extensions/bundles/packages/etc";
+
+
+    inputs.bitwarden.url = git+https://git.selfprivacy.org/SelfPrivacy/selfprivacy-nixos-config.git?ref=flakes&dir=sp-modules/bitwarden;
+
+    inputs.gitea.url = git+https://git.selfprivacy.org/SelfPrivacy/selfprivacy-nixos-config.git?ref=flakes&dir=sp-modules/gitea;
+
+    inputs.jitsi-meet.url = git+https://git.selfprivacy.org/SelfPrivacy/selfprivacy-nixos-config.git?ref=flakes&dir=sp-modules/jitsi-meet;
+
+    outputs = _: { };
+}
+"""
 
 
 @pytest.fixture
 def some_services_flake_mock(mocker, datadir):
+    flake_config_path = datadir / "some_services.nix"
     mocker.patch(
         "selfprivacy_api.services.flake_service_manager.FLAKE_CONFIG_PATH",
-        new=datadir / "some_services.nix",
+        new=flake_config_path,
     )
+    return flake_config_path
 
 
 @pytest.fixture
 def no_services_flake_mock(mocker, datadir):
+    flake_config_path = datadir / "no_services.nix"
     mocker.patch(
         "selfprivacy_api.services.flake_service_manager.FLAKE_CONFIG_PATH",
-        new=datadir / "no_services.nix",
+        new=flake_config_path,
     )
+    return flake_config_path
+
+
+# ---
 
 
 def test_read_services_list(some_services_flake_mock):
-
     with FlakeServiceManager() as manager:
         services = {
             "bitwarden": "git+https://git.selfprivacy.org/SelfPrivacy/selfprivacy-nixos-config.git?ref=flakes&dir=sp-modules/bitwarden",
@@ -47,6 +95,11 @@ def test_change_services_list(some_services_flake_mock):
     with FlakeServiceManager() as manager:
         assert manager.services == services
 
+    with open(some_services_flake_mock, "r", encoding="utf-8") as file:
+        file_content = file.read().strip()
+
+    assert all_services_file.strip() == file_content
+
 
 def test_read_empty_services_list(no_services_flake_mock):
     with FlakeServiceManager() as manager:
@@ -70,3 +123,8 @@ def test_change_empty_services_list(no_services_flake_mock):
 
     with FlakeServiceManager() as manager:
         assert manager.services == services
+
+    with open(no_services_flake_mock, "r", encoding="utf-8") as file:
+        file_content = file.read().strip()
+
+    assert all_services_file.strip() == file_content