change prepmanager_test.go according to prepmanager
@@ -244,7 +244,7 @@ func TestPRepManager_disablePRep(t *testing.T) {
assert.NoError(t, err)
noPRep := pm.GetPRepByOwner(owner)
- assert.Nil(t, noPRep)
+ assert.NotNil(t, noPRep)
assert.Equal(t, size-i-1, pm.Size())
