1 files changed, 38 insertions, 0 deletions
diff --git a/config/config_test.go b/config/config_test.go
new file mode 100644
index 0000000..6b99030
--- /dev/null
+++ b/config/config_test.go
@@ -0,0 +1,38 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSaveAndLoad(t *testing.T) {
+	filename := filepath.Join(t.TempDir(), "config.yaml")
+	want := Default()
+	want.Database.Path = "test.db"
+	want.Strava.ClientID = "123"
+	want.Strava.ExpiresAt = 1_700_000_000
+
+	require.NoError(t, Save(filename, want))
+	got, err := Load(filename)
+	require.NoError(t, err)
+	assert.Equal(t, want, got)
+	info, err := os.Stat(filename)
+	require.NoError(t, err)
+	assert.Equal(t, os.FileMode(0o600), info.Mode().Perm())
+}
+
+func TestSaveReplacesExistingConfigAtomically(t *testing.T) {
+	filename := filepath.Join(t.TempDir(), "config.yaml")
+	require.NoError(t, Save(filename, Default()))
+	updated := Default()
+	updated.Server.Address = "127.0.0.1:9090"
+	require.NoError(t, Save(filename, updated))
+
+	got, err := Load(filename)
+	require.NoError(t, err)
+	assert.Equal(t, "127.0.0.1:9090", got.Server.Address)
+}