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_zero_matcher.go

@@ -0,0 +1,28 @@
+package matchers
+
+import (
+	"reflect"
+
+	"github.com/onsi/gomega/format"
+)
+
+type BeZeroMatcher struct {
+}
+
+func (matcher *BeZeroMatcher) Match(actual interface{}) (success bool, err error) {
+	if actual == nil {
+		return true, nil
+	}
+	zeroValue := reflect.Zero(reflect.TypeOf(actual)).Interface()
+
+	return reflect.DeepEqual(zeroValue, actual), nil
+
+}
+
+func (matcher *BeZeroMatcher) FailureMessage(actual interface{}) (message string) {
+	return format.Message(actual, "to be zero-valued")
+}
+
+func (matcher *BeZeroMatcher) NegatedFailureMessage(actual interface{}) (message string) {
+	return format.Message(actual, "not to be zero-valued")
+}