querylog: fix tests for windows

internal/querylog/qlog_test.go

@@ -6,6 +6,7 @@ import (
 	"math/rand"
 	"net"
 	"os"
+	"runtime"
 	"sort"
 	"testing"
 	"time"
@@ -26,12 +27,30 @@ func TestMain(m *testing.M) {
 func prepareTestDir(t *testing.T) string {
 	t.Helper()
 
-	dir, err := ioutil.TempDir("", "agh-tests")
+	wd, err := os.Getwd()
+	require.Nil(t, err)
+
+	dir, err := ioutil.TempDir(wd, "agh-tests")
 	require.Nil(t, err)
 	require.NotEmpty(t, dir)
 
 	t.Cleanup(func() {
-		assert.Nil(t, os.RemoveAll(dir))
+		// TODO(e.burkov): Replace with t.TempDir methods after updating
+		// go version to 1.15.
+		start := time.Now()
+		for {
+			err := os.RemoveAll(dir)
+			if err == nil {
+				break
+			}
+
+			if runtime.GOOS != "windows" || time.Since(start) >= 500*time.Millisecond {
+				break
+			}
+			time.Sleep(5 * time.Millisecond)
+		}
+
+		assert.Nil(t, err)
 	})
 
 	return dir