tcontext_test.go

Documentation: k8s.io/kubernetes/test/utils/ktesting

     1  /*
     2  Copyright 2023 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package ktesting_test
    18  
    19  import (
    20  	"sync"
    21  	"testing"
    22  
    23  	"github.com/stretchr/testify/assert"
    24  
    25  	apiextensions "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
    26  	"k8s.io/client-go/dynamic"
    27  	clientset "k8s.io/client-go/kubernetes"
    28  	"k8s.io/client-go/rest"
    29  	"k8s.io/client-go/restmapper"
    30  	"k8s.io/klog/v2"
    31  	"k8s.io/kubernetes/test/utils/ktesting"
    32  )
    33  
    34  func TestCancelManual(t *testing.T) {
    35  	tCtx := ktesting.Init(t)
    36  	var wg sync.WaitGroup
    37  	wg.Add(1)
    38  	go func() {
    39  		defer wg.Done()
    40  		// Blocks until tCtx.Cancel is called below.
    41  		<-tCtx.Done()
    42  	}()
    43  	tCtx.Cancel("manually canceled")
    44  	wg.Wait()
    45  }
    46  
    47  func TestCancelAutomatic(t *testing.T) {
    48  	var wg sync.WaitGroup
    49  	// This callback gets registered first and thus
    50  	// gets invoked last.
    51  	t.Cleanup(wg.Wait)
    52  	tCtx := ktesting.Init(t)
    53  	wg.Add(1)
    54  	go func() {
    55  		defer wg.Done()
    56  		// Blocks until the context gets canceled automatically.
    57  		<-tCtx.Done()
    58  	}()
    59  }
    60  
    61  func TestCancelCtx(t *testing.T) {
    62  	tCtx := ktesting.Init(t)
    63  	var discardLogger klog.Logger
    64  	tCtx = ktesting.WithLogger(tCtx, discardLogger)
    65  	tCtx = ktesting.WithRESTConfig(tCtx, new(rest.Config))
    66  	baseCtx := tCtx
    67  
    68  	tCtx.Cleanup(func() {
    69  		if tCtx.Err() == nil {
    70  			t.Error("context should be canceled but isn't")
    71  		}
    72  	})
    73  	tCtx.CleanupCtx(func(tCtx ktesting.TContext) {
    74  		if tCtx.Err() != nil {
    75  			t.Errorf("context should not be canceled but is: %v", tCtx.Err())
    76  		}
    77  		assert.Equal(t, baseCtx.Logger(), tCtx.Logger(), "Logger()")
    78  		assert.Equal(t, baseCtx.RESTConfig(), tCtx.RESTConfig(), "RESTConfig()")
    79  		assert.Equal(t, baseCtx.RESTMapper(), tCtx.RESTMapper(), "RESTMapper()")
    80  		assert.Equal(t, baseCtx.Client(), tCtx.Client(), "Client()")
    81  		assert.Equal(t, baseCtx.Dynamic(), tCtx.Dynamic(), "Dynamic()")
    82  		assert.Equal(t, baseCtx.APIExtensions(), tCtx.APIExtensions(), "APIExtensions()")
    83  	})
    84  
    85  	// Cancel, then let testing.T invoke test cleanup.
    86  	tCtx.Cancel("test is complete")
    87  }
    88  
    89  func TestWithTB(t *testing.T) {
    90  	tCtx := ktesting.Init(t)
    91  
    92  	cfg := new(rest.Config)
    93  	mapper := new(restmapper.DeferredDiscoveryRESTMapper)
    94  	client := clientset.New(nil)
    95  	dynamic := dynamic.New(nil)
    96  	apiextensions := apiextensions.New(nil)
    97  	tCtx = ktesting.WithClients(tCtx, cfg, mapper, client, dynamic, apiextensions)
    98  
    99  	t.Run("sub", func(t *testing.T) {
   100  		tCtx := ktesting.WithTB(tCtx, t)
   101  
   102  		assert.Equal(t, cfg, tCtx.RESTConfig(), "RESTConfig")
   103  		assert.Equal(t, mapper, tCtx.RESTMapper(), "RESTMapper")
   104  		assert.Equal(t, client, tCtx.Client(), "Client")
   105  		assert.Equal(t, dynamic, tCtx.Dynamic(), "Dynamic")
   106  		assert.Equal(t, apiextensions, tCtx.APIExtensions(), "APIExtensions")
   107  
   108  		tCtx.Cancel("test is complete")
   109  	})
   110  
   111  	if err := tCtx.Err(); err != nil {
   112  		t.Errorf("parent TContext should not have been cancelled: %v", err)
   113  	}
   114  }
   115
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