Implement notifications service with shared messaging and email drivers (#36)

backend/notifications/app/config_test.go

@@ -0,0 +1,35 @@
+package app
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestExampleConfigAndSecrets(t *testing.T) {
+	t.Setenv("SXCHNGE_NOTIFICATIONS_PRODUCT_TOKEN", strings.Repeat("a", 32))
+	c, err := Load("../config.example.yml")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if c.Email.Driver != "resend" || c.Messaging.Driver != "NATS" || c.Database.Driver != "mongodb" {
+		t.Fatal("wrong driver configuration")
+	}
+	t.Setenv("SXCHNGE_NOTIFICATIONS_PRODUCT_TOKEN", "")
+	if _, err = Load("../config.example.yml"); err == nil {
+		t.Fatal("missing credentials accepted")
+	}
+	t.Setenv("SXCHNGE_NOTIFICATIONS_PRODUCT_TOKEN", strings.Repeat("a", 32))
+	data, err := os.ReadFile("../config.example.yml")
+	if err != nil {
+		t.Fatal(err)
+	}
+	path := filepath.Join(t.TempDir(), "config.yml")
+	if err = os.WriteFile(path, append(data, []byte("\n---\nunexpected: document\n")...), 0600); err != nil {
+		t.Fatal(err)
+	}
+	if _, err = Load(path); err == nil {
+		t.Fatal("extra YAML document accepted")
+	}
+}