github.com/richardbowden/terraform@v0.6.12-0.20160901200758-30ea22c25211/helper/signalwrapper/wrapper_test.go (about)

     1  package signalwrapper
     2  
     3  import (
     4  	"errors"
     5  	"testing"
     6  	"time"
     7  )
     8  
     9  func TestWrapped_goodCh(t *testing.T) {
    10  	errVal := errors.New("hi")
    11  	f := func(<-chan struct{}) error { return errVal }
    12  	err := <-Run(f).ErrCh
    13  	if err != errVal {
    14  		t.Fatalf("bad: %#v", err)
    15  	}
    16  }
    17  
    18  func TestWrapped_goodWait(t *testing.T) {
    19  	errVal := errors.New("hi")
    20  	f := func(<-chan struct{}) error {
    21  		time.Sleep(10 * time.Millisecond)
    22  		return errVal
    23  	}
    24  
    25  	wrapped := Run(f)
    26  
    27  	// Once
    28  	{
    29  		err := wrapped.Wait()
    30  		if err != errVal {
    31  			t.Fatalf("bad: %#v", err)
    32  		}
    33  	}
    34  
    35  	// Again
    36  	{
    37  		err := wrapped.Wait()
    38  		if err != errVal {
    39  			t.Fatalf("bad: %#v", err)
    40  		}
    41  	}
    42  }
    43  
    44  func TestWrapped_cancel(t *testing.T) {
    45  	errVal := errors.New("hi")
    46  	f := func(ch <-chan struct{}) error {
    47  		<-ch
    48  		return errVal
    49  	}
    50  
    51  	wrapped := Run(f)
    52  
    53  	// Once
    54  	{
    55  		err := wrapped.Cancel()
    56  		if err != errVal {
    57  			t.Fatalf("bad: %#v", err)
    58  		}
    59  	}
    60  
    61  	// Again
    62  	{
    63  		err := wrapped.Cancel()
    64  		if err != errVal {
    65  			t.Fatalf("bad: %#v", err)
    66  		}
    67  	}
    68  }
    69  
    70  func TestWrapped_waitAndCancel(t *testing.T) {
    71  	errVal := errors.New("hi")
    72  	readyCh := make(chan struct{})
    73  	f := func(ch <-chan struct{}) error {
    74  		<-ch
    75  		<-readyCh
    76  		return errVal
    77  	}
    78  
    79  	wrapped := Run(f)
    80  
    81  	// Run both cancel and wait and wait some time to hope they're
    82  	// scheduled. We could _ensure_ both are scheduled by using some
    83  	// more lines of code but this is probably just good enough.
    84  	go wrapped.Cancel()
    85  	go wrapped.Wait()
    86  	close(readyCh)
    87  	time.Sleep(10 * time.Millisecond)
    88  
    89  	// Check it by calling Cancel again
    90  	err := wrapped.Cancel()
    91  	if err != errVal {
    92  		t.Fatalf("bad: %#v", err)
    93  	}
    94  }