fixed an issue in TestWALRestoreCorrupted

wal_test.go

@@ -19,6 +19,7 @@ import (
 	"math/rand"
 	"os"
 	"testing"
+	"time"
 
 	"github.com/go-kit/kit/log"
 	"github.com/prometheus/tsdb/fileutil"
@@ -370,6 +371,11 @@ func TestWALRestoreCorrupted(t *testing.T) {
 
 			testutil.Ok(t, w.cut())
 
+			//Sleep 2 seconds to avoid error where cut and test "cases" function may write or
+			//truncate the file out of orders as "cases" are not synchronized with cut.
+			//Hopefully cut will complete by 2 seconds
+			time.Sleep(2 * time.Second)
+
 			testutil.Ok(t, w.LogSamples([]RefSample{{T: 3, V: 4}}))
 			testutil.Ok(t, w.LogSamples([]RefSample{{T: 5, V: 6}}))