github.com/sacloud/iaas-api-go@v1.12.0/helper/wait/simple_state_waiter_test.go (about)

     1  // Copyright 2016-2022 The sacloud/iaas-api-go Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package wait
    16  
    17  import (
    18  	"context"
    19  	"errors"
    20  	"testing"
    21  	"time"
    22  
    23  	"github.com/stretchr/testify/require"
    24  )
    25  
    26  func TestSimpleStateWaiter(t *testing.T) {
    27  	t.Run("timeout", func(t *testing.T) {
    28  		waiter := &SimpleStateWaiter{
    29  			ReadStateFunc: func() (bool, error) {
    30  				return false, nil
    31  			},
    32  			Timeout:         100 * time.Millisecond,
    33  			PollingInterval: 1 * time.Millisecond,
    34  		}
    35  		ctx := context.Background()
    36  		_, err := waiter.WaitForState(ctx)
    37  		require.Error(t, err)
    38  		require.EqualError(t, err, "context deadline exceeded")
    39  	})
    40  
    41  	t.Run("parent context was canceled", func(t *testing.T) {
    42  		waiter := &SimpleStateWaiter{
    43  			ReadStateFunc: func() (bool, error) {
    44  				return false, nil
    45  			},
    46  			Timeout:         100 * time.Millisecond,
    47  			PollingInterval: 1 * time.Millisecond,
    48  		}
    49  		ctx, cancel := context.WithCancel(context.Background())
    50  		defer cancel()
    51  
    52  		_, err := waiter.WaitForState(ctx)
    53  		go func() {
    54  			time.Sleep(5 * time.Millisecond)
    55  			cancel()
    56  		}()
    57  
    58  		require.Error(t, err)
    59  		require.EqualError(t, err, "context deadline exceeded")
    60  	})
    61  
    62  	t.Run("ReadStateFunc returns false", func(t *testing.T) {
    63  		retry := 5
    64  		read := 0
    65  		waiter := &SimpleStateWaiter{
    66  			ReadStateFunc: func() (bool, error) {
    67  				read++
    68  				if read < retry {
    69  					return false, nil
    70  				}
    71  				return true, nil
    72  			},
    73  			Timeout:         100 * time.Millisecond,
    74  			PollingInterval: 1 * time.Millisecond,
    75  		}
    76  		ctx := context.Background()
    77  		_, err := waiter.WaitForState(ctx)
    78  
    79  		require.NoError(t, err)
    80  		require.Equal(t, retry, read)
    81  	})
    82  
    83  	t.Run("ReadStateFunc got unexpected error", func(t *testing.T) {
    84  		waiter := &SimpleStateWaiter{
    85  			ReadStateFunc: func() (bool, error) {
    86  				return false, errors.New("dummy")
    87  			},
    88  			Timeout:         100 * time.Millisecond,
    89  			PollingInterval: 1 * time.Millisecond,
    90  		}
    91  		ctx := context.Background()
    92  		_, err := waiter.WaitForState(ctx)
    93  
    94  		require.Error(t, err)
    95  		require.EqualError(t, err, "dummy")
    96  	})
    97  }