test: probe branches, local upload errors, upstream errors, rpm/gc error paths

internal/gc/gc_integration_test.go

@@ -94,3 +94,21 @@ func TestSweepNoOrphans(t *testing.T) {
 	// A sweep with nothing to collect should be a clean no-op.
 	New(testDB, testStore, time.Hour).sweep(context.Background())
 }
+
+func TestRunStopsOnContextCancel(t *testing.T) {
+	if testDB == nil {
+		t.Skip("Docker unavailable")
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	done := make(chan struct{})
+	go func() {
+		New(testDB, testStore, time.Hour).Run(ctx)
+		close(done)
+	}()
+	cancel()
+	select {
+	case <-done:
+	case <-time.After(5 * time.Second):
+		t.Fatal("Run did not return after context cancel")
+	}
+}