fix(caddyconfig): custom global Caddy config is preserved on regeneration,warn about last load error in 'uc caddy config' (fixes #412)

internal/machine/caddyconfig/service_test.go

@@ -0,0 +1,42 @@
+package caddyconfig
+
+import (
+	"errors"
+	"sync"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestService_LastReconciliationError(t *testing.T) {
+	service := NewService(t.TempDir())
+	assert.NoError(t, service.LastReconciliationError())
+
+	service.setReconciliationResult(errors.New("global Caddy config rejected"))
+	assert.EqualError(t, service.LastReconciliationError(), "global Caddy config rejected")
+
+	service.setReconciliationResult(nil)
+	assert.NoError(t, service.LastReconciliationError())
+}
+
+func TestService_LastReconciliationErrorConcurrent(t *testing.T) {
+	service := NewService(t.TempDir())
+	var wg sync.WaitGroup
+	for range 10 {
+		wg.Add(2)
+		go func() {
+			defer wg.Done()
+			for range 100 {
+				service.setReconciliationResult(errors.New("retry"))
+				service.setReconciliationResult(nil)
+			}
+		}()
+		go func() {
+			defer wg.Done()
+			for range 100 {
+				_ = service.LastReconciliationError()
+			}
+		}()
+	}
+	wg.Wait()
+}