assertion.go
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package assertion
import (
"fmt"
"reflect"
"github.com/onsi/gomega/types"
)
type Assertion struct {
actualInput interface{}
failWrapper *types.GomegaFailWrapper
offset int
extra []interface{}
}
func New(actualInput interface{}, failWrapper *types.GomegaFailWrapper, offset int, extra ...interface{}) *Assertion {
return &Assertion{
actualInput: actualInput,
failWrapper: failWrapper,
offset: offset,
extra: extra,
}
}
func (assertion *Assertion) Should(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool {
assertion.failWrapper.TWithHelper.Helper()
return assertion.vetExtras(optionalDescription...) && assertion.match(matcher, true, optionalDescription...)
}
func (assertion *Assertion) ShouldNot(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool {
assertion.failWrapper.TWithHelper.Helper()
return assertion.vetExtras(optionalDescription...) && assertion.match(matcher, false, optionalDescription...)
}
func (assertion *Assertion) To(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool {
assertion.failWrapper.TWithHelper.Helper()
return assertion.vetExtras(optionalDescription...) && assertion.match(matcher, true, optionalDescription...)
}
func (assertion *Assertion) ToNot(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool {
assertion.failWrapper.TWithHelper.Helper()
return assertion.vetExtras(optionalDescription...) && assertion.match(matcher, false, optionalDescription...)
}
func (assertion *Assertion) NotTo(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool {
assertion.failWrapper.TWithHelper.Helper()
return assertion.vetExtras(optionalDescription...) && assertion.match(matcher, false, optionalDescription...)
}
func (assertion *Assertion) buildDescription(optionalDescription ...interface{}) string {
switch len(optionalDescription) {
case 0:
return ""
case 1:
if describe, ok := optionalDescription[0].(func() string); ok {
return describe() + "\n"
}
}
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)
assertion.failWrapper.TWithHelper.Helper()
if err != nil {
description := assertion.buildDescription(optionalDescription...)
assertion.failWrapper.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)
}
description := assertion.buildDescription(optionalDescription...)
assertion.failWrapper.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.failWrapper.TWithHelper.Helper()
assertion.failWrapper.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, ""
}