Add prune retention planning

internal/config/validate_test.go

@@ -3,6 +3,7 @@ package config
 import (
 	"strings"
 	"testing"
+	"time"
 )
 
 func TestValidatePublishTransformPolicy(t *testing.T) {
@@ -175,6 +176,50 @@ func TestValidateStatePolicy(t *testing.T) {
 	}
 }
 
+func TestValidateRetentionPolicy(t *testing.T) {
+	olderThan := Duration(24 * time.Hour)
+	zeroDuration := Duration(0)
+	keepZero := 0
+	keepThree := 3
+	keepNegative := -1
+	tests := []struct {
+		name      string
+		retention RetentionPolicy
+		wantErr   bool
+	}{
+		{name: "disabled"},
+		{name: "older than", retention: RetentionPolicy{Prune: PrunePolicy{Enabled: true, OlderThan: &olderThan}}},
+		{name: "keep zero", retention: RetentionPolicy{Prune: PrunePolicy{Enabled: true, KeepLatest: &keepZero}}},
+		{name: "keep latest", retention: RetentionPolicy{Prune: PrunePolicy{Enabled: true, KeepLatest: &keepThree}}},
+		{name: "combined", retention: RetentionPolicy{Prune: PrunePolicy{Enabled: true, OlderThan: &olderThan, KeepLatest: &keepThree}}},
+		{name: "missing policy", retention: RetentionPolicy{Prune: PrunePolicy{Enabled: true}}, wantErr: true},
+		{name: "zero older than", retention: RetentionPolicy{Prune: PrunePolicy{Enabled: true, OlderThan: &zeroDuration}}, wantErr: true},
+		{name: "negative keep latest", retention: RetentionPolicy{Prune: PrunePolicy{Enabled: true, KeepLatest: &keepNegative}}, wantErr: true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			cfg := Config{Pipelines: []Pipeline{{
+				ID:     "reports",
+				Source: Backend{Backend: BackendLocal, Path: "/source"},
+				Destinations: []Destination{{
+					ID:        "archive",
+					Backend:   BackendLocal,
+					Path:      "/destination",
+					Retention: tt.retention,
+				}},
+			}}}
+			ApplyDefaults(&cfg)
+			err := Validate(cfg)
+			if tt.wantErr && err == nil {
+				t.Fatal("Validate() error = nil, want error")
+			}
+			if !tt.wantErr && err != nil {
+				t.Fatalf("Validate() error = %v", err)
+			}
+		})
+	}
+}
+
 func TestValidateLinks(t *testing.T) {
 	tests := []struct {
 		name    string