github.com/m3db/m3@v1.5.0/src/x/instrument/invariant_test.go (about)

     1  // Copyright (c) 2018 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package instrument_test
    22  
    23  import (
    24  	"fmt"
    25  	"testing"
    26  
    27  	"github.com/m3db/m3/src/x/instrument"
    28  
    29  	"github.com/stretchr/testify/require"
    30  	"github.com/uber-go/tally"
    31  	"go.uber.org/zap"
    32  )
    33  
    34  func ExampleInvariantViolatedMetricInvocation() {
    35  	defer instrument.SetShouldPanicEnvironmentVariable(false)()
    36  	testScope := tally.NewTestScope("", nil)
    37  	opts := instrument.NewOptions().SetMetricsScope(testScope)
    38  
    39  	instrument.EmitInvariantViolation(opts)
    40  	counters := testScope.Snapshot().Counters()
    41  	counter := counters[instrument.InvariantViolatedMetricName+"+"]
    42  	fmt.Println(counter.Name(), counter.Value())
    43  	// Output: invariant_violated 1
    44  }
    45  
    46  func TestEmitInvariantViolationDoesNotPanicIfEnvNotSet(t *testing.T) {
    47  	defer instrument.SetShouldPanicEnvironmentVariable(false)()
    48  	opts := instrument.NewOptions()
    49  	require.NotPanics(t, func() {
    50  		instrument.EmitInvariantViolation(opts)
    51  	})
    52  }
    53  
    54  func TestEmitAndLogInvariantViolationDoesNotPanicIfEnvNotSet(t *testing.T) {
    55  	defer instrument.SetShouldPanicEnvironmentVariable(false)()
    56  	opts := instrument.NewOptions()
    57  	require.NotPanics(t, func() {
    58  		instrument.EmitAndLogInvariantViolation(opts, func(l *zap.Logger) {
    59  			l.Error("some_error")
    60  		})
    61  	})
    62  }
    63  
    64  func TestErrorfDoesNotPanicIfEnvNotSet(t *testing.T) {
    65  	defer instrument.SetShouldPanicEnvironmentVariable(false)()
    66  	var (
    67  		format      = "some error format: %s"
    68  		err_msg     = "error message"
    69  		expectedErr = fmt.Errorf("invariant_violated: some error format: error message")
    70  	)
    71  	require.NotPanics(t, func() {
    72  		require.Equal(
    73  			t, expectedErr, instrument.InvariantErrorf(format, err_msg))
    74  	})
    75  }
    76  
    77  func TestEmitInvariantViolationPanicsIfEnvSet(t *testing.T) {
    78  	defer instrument.SetShouldPanicEnvironmentVariable(true)()
    79  
    80  	opts := instrument.NewOptions()
    81  	require.Panics(t, func() {
    82  		instrument.EmitInvariantViolation(opts)
    83  	})
    84  }
    85  
    86  func TestEmitAndLogInvariantViolationPanicsIfEnvSet(t *testing.T) {
    87  	defer instrument.SetShouldPanicEnvironmentVariable(true)()
    88  
    89  	opts := instrument.NewOptions()
    90  	require.Panics(t, func() {
    91  		instrument.EmitAndLogInvariantViolation(opts, func(l *zap.Logger) {
    92  			l.Error("some_error")
    93  		})
    94  	})
    95  }
    96  
    97  func TestErrorfPanicsIfEnvSet(t *testing.T) {
    98  	defer instrument.SetShouldPanicEnvironmentVariable(true)()
    99  	require.Panics(t, func() {
   100  		instrument.InvariantErrorf("some_error")
   101  	})
   102  }