add test for base settings

unittests/test_base_settings.py

@@ -0,0 +1,37 @@
+import pytest
+from pydantic import ValidationError
+
+from ebd_toolchain.main import Settings
+
+
+def test_settings_from_env(monkeypatch):
+    # Mock environment variables to simulate the .env behavior
+    monkeypatch.setenv("KROKI_PORT", "8000")
+    monkeypatch.setenv("KROKI_HOST", "localhost")
+
+    # Instantiate the Settings class
+    settings = Settings()
+
+    # Assert the settings have loaded correctly from environment
+    assert settings.kroki_port == 8000
+    assert settings.kroki_host == "localhost"
+
+
+def test_settings_missing_required_fields(monkeypatch):
+    # Ensure no environment variables are set
+    monkeypatch.delenv("KROKI_PORT", raising=False)
+    monkeypatch.delenv("KROKI_HOST", raising=False)
+
+    # Expecting ValidationError due to missing required environment variables
+    with pytest.raises(ValidationError):
+        Settings()
+
+
+def test_invalid_port_value(monkeypatch):
+    # Set invalid environment variables
+    monkeypatch.setenv("KROKI_PORT", "not_an_integer")
+    monkeypatch.setenv("KROKI_HOST", "localhost")
+
+    # Expecting ValidationError because KROKI_PORT is not a valid integer
+    with pytest.raises(ValidationError):
+        Settings()