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|
package internal
import (
"fmt"
"reflect"
"github.com/onsi/gomega/types"
)
type Assertion struct {
actuals []interface{} // actual value plus all extra values
actualIndex int // value to pass to the matcher
vet vetinari // the vet to call before calling Gomega matcher
offset int
g *Gomega
}
// ...obligatory discworld reference, as "vetineer" doesn't sound ... quite right.
type vetinari func(assertion *Assertion, optionalDescription ...interface{}) bool
func NewAssertion(actualInput interface{}, g *Gomega, offset int, extra ...interface{}) *Assertion {
return &Assertion{
actuals: append([]interface{}{actualInput}, extra...),
actualIndex: 0,
vet: (*Assertion).vetActuals,
offset: offset,
g: g,
}
}
func (assertion *Assertion) WithOffset(offset int) types.Assertion {
assertion.offset = offset
return assertion
}
func (assertion *Assertion) Error() types.Assertion {
return &Assertion{
actuals: assertion.actuals,
actualIndex: len(assertion.actuals) - 1,
vet: (*Assertion).vetError,
offset: assertion.offset,
g: assertion.g,
}
}
func (assertion *Assertion) Should(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool {
assertion.g.THelper()
vetOptionalDescription("Assertion", optionalDescription...)
return assertion.vet(assertion, optionalDescription...) && assertion.match(matcher, true, optionalDescription...)
}
func (assertion *Assertion) ShouldNot(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool {
assertion.g.THelper()
vetOptionalDescription("Assertion", optionalDescription...)
return assertion.vet(assertion, optionalDescription...) && assertion.match(matcher, false, optionalDescription...)
}
func (assertion *Assertion) To(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool {
assertion.g.THelper()
vetOptionalDescription("Assertion", optionalDescription...)
return assertion.vet(assertion, optionalDescription...) && assertion.match(matcher, true, optionalDescription...)
}
func (assertion *Assertion) ToNot(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool {
assertion.g.THelper()
vetOptionalDescription("Assertion", optionalDescription...)
return assertion.vet(assertion, optionalDescription...) && assertion.match(matcher, false, optionalDescription...)
}
func (assertion *Assertion) NotTo(matcher types.GomegaMatcher, optionalDescription ...interface{}) bool {
assertion.g.THelper()
vetOptionalDescription("Assertion", optionalDescription...)
return assertion.vet(assertion, 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 {
actualInput := assertion.actuals[assertion.actualIndex]
matches, err := matcher.Match(actualInput)
assertion.g.THelper()
if err != nil {
description := assertion.buildDescription(optionalDescription...)
assertion.g.Fail(description+err.Error(), 2+assertion.offset)
return false
}
if matches != desiredMatch {
var message string
if desiredMatch {
message = matcher.FailureMessage(actualInput)
} else {
message = matcher.NegatedFailureMessage(actualInput)
}
description := assertion.buildDescription(optionalDescription...)
assertion.g.Fail(description+message, 2+assertion.offset)
return false
}
return true
}
// vetActuals vets the actual values, with the (optional) exception of a
// specific value, such as the first value in case non-error assertions, or the
// last value in case of Error()-based assertions.
func (assertion *Assertion) vetActuals(optionalDescription ...interface{}) bool {
success, message := vetActuals(assertion.actuals, assertion.actualIndex)
if success {
return true
}
description := assertion.buildDescription(optionalDescription...)
assertion.g.THelper()
assertion.g.Fail(description+message, 2+assertion.offset)
return false
}
// vetError vets the actual values, except for the final error value, in case
// the final error value is non-zero. Otherwise, it doesn't vet the actual
// values, as these are allowed to take on any values unless there is a non-zero
// error value.
func (assertion *Assertion) vetError(optionalDescription ...interface{}) bool {
if err := assertion.actuals[assertion.actualIndex]; err != nil {
// Go error result idiom: all other actual values must be zero values.
return assertion.vetActuals(optionalDescription...)
}
return true
}
// vetActuals vets a slice of actual values, optionally skipping a particular
// value slice element, such as the first or last value slice element.
func vetActuals(actuals []interface{}, skipIndex int) (bool, string) {
for i, actual := range actuals {
if i == skipIndex {
continue
}
if actual != nil {
zeroValue := reflect.Zero(reflect.TypeOf(actual)).Interface()
if !reflect.DeepEqual(zeroValue, actual) {
message := fmt.Sprintf("Unexpected non-nil/non-zero argument at index %d:\n\t<%T>: %#v", i, actual, actual)
return false, message
}
}
}
return true, ""
}
|
