github.com/outbrain/consul@v1.4.5/lib/telemetry_test.go (about)

     1  package lib
     2  
     3  import (
     4  	"reflect"
     5  	"testing"
     6  	"time"
     7  
     8  	"github.com/stretchr/testify/require"
     9  )
    10  
    11  func makeFullTelemetryConfig(t *testing.T) TelemetryConfig {
    12  	var (
    13  		strSliceVal = []string{"foo"}
    14  		strVal      = "foo"
    15  		intVal      = int64(1 * time.Second)
    16  	)
    17  
    18  	cfg := TelemetryConfig{}
    19  	cfgP := reflect.ValueOf(&cfg)
    20  	cfgV := cfgP.Elem()
    21  	for i := 0; i < cfgV.NumField(); i++ {
    22  		f := cfgV.Field(i)
    23  		if !f.IsValid() || !f.CanSet() {
    24  			continue
    25  		}
    26  		// Set non-zero values for all fields. We only implement kinds that exist
    27  		// now for brevity but will fail the test if a new field type is added since
    28  		// this is likely not implemented in MergeDefaults either.
    29  		switch f.Kind() {
    30  		case reflect.Slice:
    31  			if f.Type() != reflect.TypeOf(strSliceVal) {
    32  				t.Fatalf("unknown slice type in TelemetryConfig." +
    33  					" You need to update MergeDefaults and this test code.")
    34  			}
    35  			f.Set(reflect.ValueOf(strSliceVal))
    36  		case reflect.Int, reflect.Int64: // time.Duration == int64
    37  			f.SetInt(intVal)
    38  		case reflect.String:
    39  			f.SetString(strVal)
    40  		case reflect.Bool:
    41  			f.SetBool(true)
    42  		default:
    43  			t.Fatalf("unknown field type in TelemetryConfig" +
    44  				" You need to update MergeDefaults and this test code.")
    45  		}
    46  	}
    47  	return cfg
    48  }
    49  
    50  func TestTelemetryConfig_MergeDefaults(t *testing.T) {
    51  	tests := []struct {
    52  		name     string
    53  		cfg      TelemetryConfig
    54  		defaults TelemetryConfig
    55  		want     TelemetryConfig
    56  	}{
    57  		{
    58  			name: "basic merge",
    59  			cfg: TelemetryConfig{
    60  				StatsiteAddr: "stats.it:4321",
    61  			},
    62  			defaults: TelemetryConfig{
    63  				StatsdAddr:   "localhost:5678",
    64  				StatsiteAddr: "localhost:1234",
    65  			},
    66  			want: TelemetryConfig{
    67  				StatsdAddr:   "localhost:5678",
    68  				StatsiteAddr: "stats.it:4321",
    69  			},
    70  		},
    71  		{
    72  			// This test uses reflect to build a TelemetryConfig with every value set
    73  			// to ensure that we exercise every possible field type. This means that
    74  			// if new fields are added that are not supported types in the code, this
    75  			// test should either ensure they work or fail to build the test case and
    76  			// fail the test.
    77  			name:     "exhaustive",
    78  			cfg:      TelemetryConfig{},
    79  			defaults: makeFullTelemetryConfig(t),
    80  			want:     makeFullTelemetryConfig(t),
    81  		},
    82  	}
    83  	for _, tt := range tests {
    84  		t.Run(tt.name, func(t *testing.T) {
    85  			c := tt.cfg
    86  			c.MergeDefaults(&tt.defaults)
    87  			require.Equal(t, tt.want, c)
    88  		})
    89  	}
    90  }