feat(test): add --clear-data flag to clear app data on launch

cmd/sanderling/main.go

@@ -23,6 +23,7 @@ type testOptions struct {
 	duration  time.Duration
 	seed      int64
 	output    string
+	clearData bool
 }
 
 const topUsage = `sanderling is a property-based UI fuzzer for mobile apps.
@@ -51,6 +52,7 @@ func parseTestArgs(args []string, stderr io.Writer) (testOptions, error) {
 	flagSet.DurationVar(&options.duration, "duration", 5*time.Minute, "total test duration")
 	flagSet.Int64Var(&options.seed, "seed", 0, "RNG seed (0 = random)")
 	flagSet.StringVar(&options.output, "output", "./runs", "output directory for traces")
+	flagSet.BoolVar(&options.clearData, "clear-data", false, "clear app data before launching so the run starts from a fresh install")
 	if err := flagSet.Parse(args); err != nil {
 		return testOptions{}, err
 	}

cmd/sanderling/test_run.go

@@ -17,5 +17,6 @@ func runTestPipeline(ctx context.Context, options testOptions, stdout io.Writer)
 		Duration:  options.duration,
 		Seed:      options.seed,
 		Output:    options.output,
+		ClearData: options.clearData,
 	}, stdout)
 }