Add structured destination comparison details

internal/publish/plan_test.go

@@ -0,0 +1,41 @@
+package publish
+
+import (
+	"testing"
+	"time"
+
+	"gitea.maximumdirect.net/eric/distributor/internal/config"
+	"gitea.maximumdirect.net/eric/distributor/internal/state"
+	"gitea.maximumdirect.net/eric/distributor/internal/storage/fake"
+	"gitea.maximumdirect.net/eric/distributor/internal/testutil"
+)
+
+func TestCompareDestinationFixedPathReportsDestinationNewerDetail(t *testing.T) {
+	sourceBackend := fake.New()
+	sourceBundle := testutil.WriteFakeSourceBundle(t, sourceBackend, "bundle", testutil.BundleOptions{})
+	destinationState := testutil.DestinationState(sourceBundle.Manifest, testutil.DestinationStateOptions{})
+	destinationState.Source.Manifest.ID = "latest.previous"
+	destinationState.Source.Manifest.Created = sourceBundle.Manifest.Created.Add(time.Hour)
+
+	comparison := compareDestination(Request{
+		PipelineID:            "reports",
+		DestinationID:         "archive",
+		SourceBundle:          sourceBundle,
+		DestinationBundlePath: "",
+		PathMapping:           config.PathMappingFixed,
+		State:                 config.StatePolicy{Mode: config.StateModeSingleOwner},
+	}, state.DestinationStatus{State: &destinationState, HasContents: true})
+
+	if comparison.Outcome != state.OutcomeDestinationNewer {
+		t.Fatalf("comparison outcome = %s, want %s", comparison.Outcome, state.OutcomeDestinationNewer)
+	}
+	if comparison.Reason != "fixed destination source is newer than selected source" {
+		t.Fatalf("comparison reason = %q, want fixed-path newer reason", comparison.Reason)
+	}
+	if comparison.Detail.Kind != state.ComparisonDetailDestinationNewer {
+		t.Fatalf("detail kind = %q, want %q", comparison.Detail.Kind, state.ComparisonDetailDestinationNewer)
+	}
+	if comparison.Detail.CurrentSourceID != sourceBundle.Manifest.ID || comparison.Detail.DestinationSourceID != "latest.previous" {
+		t.Fatalf("detail = %#v, want source ids", comparison.Detail)
+	}
+}