Centralize link URL validation

internal/config/validate_test.go

@@ -1,6 +1,9 @@
 package config
 
-import "testing"
+import (
+	"strings"
+	"testing"
+)
 
 func TestValidatePublishTransformPolicy(t *testing.T) {
 	tests := publishTransformPolicyCases()
@@ -145,6 +148,28 @@ func TestValidateLinks(t *testing.T) {
 	}
 }
 
+func TestValidateLinksReportsFieldContext(t *testing.T) {
+	cfg := Config{Pipelines: []Pipeline{{
+		ID:     "reports",
+		Source: Backend{Backend: BackendLocal, Path: "/source"},
+		Destinations: []Destination{{
+			ID:      "web",
+			Backend: BackendLocal,
+			Path:    "/destination",
+			Links:   &Links{BaseURL: "https://reports.example.com/archive?preview=1", Primary: LinkPrimaryAuto},
+		}},
+	}}}
+	ApplyDefaults(&cfg)
+	err := Validate(cfg)
+	if err == nil {
+		t.Fatal("Validate() error = nil, want error")
+	}
+	want := "pipelines[0].destinations[0].links.base_url must not include a query string"
+	if !strings.Contains(err.Error(), want) {
+		t.Fatalf("Validate() error = %q, want %q", err, want)
+	}
+}
+
 type publishTransformPolicyCase struct {
 	name      string
 	publish   PublishPolicy