github.com/Schaudge/grailbase@v0.0.0-20240223061707-44c758a471c0/status/status_test.go (about)

     1  // Copyright 2018 GRAIL, Inc. All rights reserved.
     2  // Use of this source code is governed by the Apache 2.0
     3  // license that can be found in the LICENSE file.
     4  
     5  package status
     6  
     7  import (
     8  	"math/rand"
     9  	"testing"
    10  )
    11  
    12  func TestStatus(t *testing.T) {
    13  	var status Status
    14  	if got, want := len(status.Groups()), 0; got != want {
    15  		t.Errorf("got %v, want %v", got, want)
    16  	}
    17  	c := status.Wait(-1)
    18  	var v int
    19  	select {
    20  	case v = <-c:
    21  	default:
    22  		t.Fatal("expected update")
    23  	}
    24  	if got, want := v, 0; got != want {
    25  		t.Errorf("got %v, want %v", got, want)
    26  	}
    27  	c = status.Wait(v)
    28  	select {
    29  	case <-c:
    30  		t.Fatal("unexpected update")
    31  	default:
    32  	}
    33  	g := status.Group("test")
    34  	select {
    35  	case v = <-c:
    36  	default:
    37  		t.Fatal("expected update")
    38  	}
    39  	if got, want := v, 1; got != want {
    40  		t.Errorf("got %v, want %v", got, want)
    41  	}
    42  	c = status.Wait(v)
    43  	task := g.Start("hello world")
    44  	select {
    45  	case v = <-c:
    46  	default:
    47  		t.Fatal("expected update")
    48  	}
    49  	c = status.Wait(v)
    50  	task.Print("an update")
    51  	select {
    52  	case v = <-c:
    53  	default:
    54  		t.Fatal("expected update")
    55  	}
    56  	groups := status.Groups()
    57  	if got, want := len(groups), 1; got != want {
    58  		t.Fatalf("got %v, want %v", got, want)
    59  	}
    60  	if got, want := groups[0], g; got != want {
    61  		t.Errorf("got %v, want %v", got, want)
    62  	}
    63  	g = groups[0]
    64  	if got, want := g.Value().Title, "test"; got != want {
    65  		t.Errorf("got %v, want %v", got, want)
    66  	}
    67  	tasks := g.Tasks()
    68  	if got, want := len(tasks), 1; got != want {
    69  		t.Fatalf("got %v, want %v", got, want)
    70  	}
    71  	task = tasks[0]
    72  	if got, want := task.Value().Title, "hello world"; got != want {
    73  		t.Errorf("got %v, want %v", got, want)
    74  	}
    75  	if got, want := task.Value().Status, "an update"; got != want {
    76  		t.Errorf("got %v, want %v", got, want)
    77  	}
    78  }
    79  
    80  func TestStatusManyWaiters(t *testing.T) {
    81  	var (
    82  		status   Status
    83  		versions = rand.Perm(100)
    84  		waiters  = make([]<-chan int, len(versions))
    85  	)
    86  	for _, v := range versions {
    87  		waiters[v] = status.Wait(v)
    88  	}
    89  	for v := <-status.Wait(-1); v < len(versions); v++ {
    90  		for w := v; w < len(versions); w++ {
    91  			select {
    92  			case <-waiters[w]:
    93  				t.Errorf("unexpected ready waiter %v", w)
    94  			default:
    95  			}
    96  		}
    97  		status.notify()
    98  		select {
    99  		case <-waiters[v]:
   100  		default:
   101  			t.Errorf("expected waiter %v to be ready (version %d)", v, status.version)
   102  		}
   103  	}
   104  }