github.com/wallyworld/juju@v0.0.0-20161013125918-6cf1bc9d917a/state/watcher/helpers_test.go (about)

     1  // Copyright 2012, 2013 Canonical Ltd.
     2  // Licensed under the AGPLv3, see LICENCE file for details.
     3  
     4  package watcher_test
     5  
     6  import (
     7  	stderrors "errors"
     8  
     9  	gc "gopkg.in/check.v1"
    10  	"gopkg.in/tomb.v1"
    11  
    12  	"github.com/juju/juju/state/watcher"
    13  )
    14  
    15  type dummyWatcher struct {
    16  	err error
    17  }
    18  
    19  func (w *dummyWatcher) Stop() error {
    20  	return w.err
    21  }
    22  
    23  func (w *dummyWatcher) Err() error {
    24  	return w.err
    25  }
    26  
    27  func (s *FastPeriodSuite) TestStop(c *gc.C) {
    28  	t := &tomb.Tomb{}
    29  	watcher.Stop(&dummyWatcher{nil}, t)
    30  	c.Assert(t.Err(), gc.Equals, tomb.ErrStillAlive)
    31  
    32  	watcher.Stop(&dummyWatcher{stderrors.New("BLAM")}, t)
    33  	c.Assert(t.Err(), gc.ErrorMatches, "BLAM")
    34  }
    35  
    36  func (s *FastPeriodSuite) TestEnsureErr(c *gc.C) {
    37  	err := watcher.EnsureErr(&dummyWatcher{stderrors.New("POW")})
    38  	c.Assert(err, gc.ErrorMatches, "POW")
    39  
    40  	err = watcher.EnsureErr(&dummyWatcher{tomb.ErrStillAlive})
    41  	c.Assert(err, gc.ErrorMatches, "expected .* to be stopped: tomb: still alive")
    42  
    43  	err = watcher.EnsureErr(&dummyWatcher{nil})
    44  	c.Assert(err, gc.ErrorMatches, "expected an error from .*, got nil")
    45  }