Revert vendor directory to support old golang (GOPATH mode)

gomodule is still in progress to migrate for now, hence multus
team decide to keep vendor directory to support build without
gomodule.

vendor/github.com/onsi/gomega/internal/assertion/assertion.go

@@ -0,0 +1,98 @@
+package assertion
+
+import (
+	"fmt"
+	"reflect"
+
+	"github.com/onsi/gomega/types"
+)
+
+type Assertion struct {
+	actualInput interface{}
+	fail        types.GomegaFailHandler
+	offset      int
+	extra       []interface{}
+}
+
+func New(actualInput interface{}, fail types.GomegaFailHandler, offset int, extra ...interface{}) *Assertion {
+	return &Assertion{
+		actualInput: actualInput,
+		fail:        fail,
+		offset:      offset,
+		extra:       extra,
+	}
+}
+
+func (assertion *Assertion) Should(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool {
+	return assertion.vetExtras(optionalDescription...) && assertion.match(matcher, true, optionalDescription...)
+}
+
+func (assertion *Assertion) ShouldNot(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool {
+	return assertion.vetExtras(optionalDescription...) && assertion.match(matcher, false, optionalDescription...)
+}
+
+func (assertion *Assertion) To(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool {
+	return assertion.vetExtras(optionalDescription...) && assertion.match(matcher, true, optionalDescription...)
+}
+
+func (assertion *Assertion) ToNot(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool {
+	return assertion.vetExtras(optionalDescription...) && assertion.match(matcher, false, optionalDescription...)
+}
+
+func (assertion *Assertion) NotTo(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool {
+	return assertion.vetExtras(optionalDescription...) && assertion.match(matcher, false, optionalDescription...)
+}
+
+func (assertion *Assertion) buildDescription(optionalDescription ...interface{}) string {
+	switch len(optionalDescription) {
+	case 0:
+		return ""
+	default:
+		return fmt.Sprintf(optionalDescription[0].(string), optionalDescription[1:]...) + "\n"
+	}
+}
+
+func (assertion *Assertion) match(matcher types.GomegaMatcher, desiredMatch bool, optionalDescription ...interface{}) bool {
+	matches, err := matcher.Match(assertion.actualInput)
+	description := assertion.buildDescription(optionalDescription...)
+	if err != nil {
+		assertion.fail(description+err.Error(), 2+assertion.offset)
+		return false
+	}
+	if matches != desiredMatch {
+		var message string
+		if desiredMatch {
+			message = matcher.FailureMessage(assertion.actualInput)
+		} else {
+			message = matcher.NegatedFailureMessage(assertion.actualInput)
+		}
+		assertion.fail(description+message, 2+assertion.offset)
+		return false
+	}
+
+	return true
+}
+
+func (assertion *Assertion) vetExtras(optionalDescription ...interface{}) bool {
+	success, message := vetExtras(assertion.extra)
+	if success {
+		return true
+	}
+
+	description := assertion.buildDescription(optionalDescription...)
+	assertion.fail(description+message, 2+assertion.offset)
+	return false
+}
+
+func vetExtras(extras []interface{}) (bool, string) {
+	for i, extra := range extras {
+		if extra != nil {
+			zeroValue := reflect.Zero(reflect.TypeOf(extra)).Interface()
+			if !reflect.DeepEqual(zeroValue, extra) {
+				message := fmt.Sprintf("Unexpected non-nil/non-zero extra argument at index %d:\n\t<%T>: %#v", i+1, extra, extra)
+				return false, message
+			}
+		}
+	}
+	return true, ""
+}