github.com/yankunsam/loki/v2@v2.6.3-0.20220817130409-389df5235c27/pkg/util/cfg/files_test.go (about)

     1  package cfg
     2  
     3  import (
     4  	"flag"
     5  	"testing"
     6  
     7  	"github.com/grafana/dskit/flagext"
     8  	"github.com/stretchr/testify/require"
     9  )
    10  
    11  type testCfg struct {
    12  	v int
    13  }
    14  
    15  func (cfg *testCfg) RegisterFlags(f *flag.FlagSet) {
    16  	cfg.v++
    17  }
    18  
    19  func (cfg *testCfg) Clone() flagext.Registerer {
    20  	return func(cfg testCfg) flagext.Registerer {
    21  		return &cfg
    22  	}(*cfg)
    23  }
    24  
    25  func TestConfigFileLoaderDoesNotMutate(t *testing.T) {
    26  	cfg := &testCfg{}
    27  	err := ConfigFileLoader(nil, "something")(cfg)
    28  	require.Nil(t, err)
    29  	require.Equal(t, 0, cfg.v)
    30  
    31  	cfg.RegisterFlags(nil)
    32  	require.Equal(t, 1, cfg.v)
    33  }