Switch to ginkgo/gomega for tests

This switches over to ginkgo/gomega for tests, which makes writing
certain tests easier/more fluent in the future.

vendor/github.com/onsi/gomega/matchers/be_closed_matcher.go

@@ -0,0 +1,46 @@
+package matchers
+
+import (
+	"fmt"
+	"reflect"
+
+	"github.com/onsi/gomega/format"
+)
+
+type BeClosedMatcher struct {
+}
+
+func (matcher *BeClosedMatcher) Match(actual interface{}) (success bool, err error) {
+	if !isChan(actual) {
+		return false, fmt.Errorf("BeClosed matcher expects a channel.  Got:\n%s", format.Object(actual, 1))
+	}
+
+	channelType := reflect.TypeOf(actual)
+	channelValue := reflect.ValueOf(actual)
+
+	if channelType.ChanDir() == reflect.SendDir {
+		return false, fmt.Errorf("BeClosed matcher cannot determine if a send-only channel is closed or open.  Got:\n%s", format.Object(actual, 1))
+	}
+
+	winnerIndex, _, open := reflect.Select([]reflect.SelectCase{
+		reflect.SelectCase{Dir: reflect.SelectRecv, Chan: channelValue},
+		reflect.SelectCase{Dir: reflect.SelectDefault},
+	})
+
+	var closed bool
+	if winnerIndex == 0 {
+		closed = !open
+	} else if winnerIndex == 1 {
+		closed = false
+	}
+
+	return closed, nil
+}
+
+func (matcher *BeClosedMatcher) FailureMessage(actual interface{}) (message string) {
+	return format.Message(actual, "to be closed")
+}
+
+func (matcher *BeClosedMatcher) NegatedFailureMessage(actual interface{}) (message string) {
+	return format.Message(actual, "to be open")
+}