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assert.go
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assert.go
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package rxgo
import (
"testing"
"errors"
"github.com/reactivex/rxgo/handlers"
"github.com/reactivex/rxgo/optional"
"github.com/stretchr/testify/assert"
)
// Assertion lists the assertions which may be configured on an Observable.
type Assertion interface {
apply(*assertion)
hasItemsFunc() (bool, []interface{})
hasSizeFunc() (bool, int)
hasValueFunc() (bool, interface{})
hasRaisedErrorFunc() (bool, error)
hasRaisedAnErrorFunc() bool
isEmptyFunc() (bool, bool)
}
type assertion struct {
f func(*assertion)
checkHasItems bool
hasItems []interface{}
checkHasSize bool
hasSize int
checkHasValue bool
hasValue interface{}
checkHasRaisedError bool
hasRaisedError error
checkHasRaisedAnError bool
checkIsEmpty bool
isEmpty bool
}
func (ass *assertion) hasItemsFunc() (bool, []interface{}) {
return ass.checkHasItems, ass.hasItems
}
func (ass *assertion) hasSizeFunc() (bool, int) {
return ass.checkHasSize, ass.hasSize
}
func (ass *assertion) hasValueFunc() (bool, interface{}) {
return ass.checkHasValue, ass.hasValue
}
func (ass *assertion) hasRaisedErrorFunc() (bool, error) {
return ass.checkHasRaisedError, ass.hasRaisedError
}
func (ass *assertion) hasRaisedAnErrorFunc() bool {
return ass.checkHasRaisedAnError
}
func (ass *assertion) isEmptyFunc() (bool, bool) {
return ass.checkIsEmpty, ass.isEmpty
}
func (ass *assertion) apply(do *assertion) {
ass.f(do)
}
func newAssertion(f func(*assertion)) *assertion {
return &assertion{
f: f,
}
}
func parseAssertions(assertions ...Assertion) Assertion {
a := new(assertion)
for _, assertion := range assertions {
assertion.apply(a)
}
return a
}
// HasItems checks that an observable produces the corresponding items.
func HasItems(items ...interface{}) Assertion {
return newAssertion(func(a *assertion) {
a.checkHasItems = true
a.hasItems = items
})
}
// HasItems checks that an observable produces the corresponding number of items.
func HasSize(size int) Assertion {
return newAssertion(func(a *assertion) {
a.checkHasSize = true
a.hasSize = size
})
}
// IsEmpty checks that an observable produces zero items.
func IsEmpty() Assertion {
return newAssertion(func(a *assertion) {
a.checkIsEmpty = true
a.isEmpty = true
})
}
// IsNotEmpty checks that an observable produces items.
func IsNotEmpty() Assertion {
return newAssertion(func(a *assertion) {
a.checkIsEmpty = true
a.isEmpty = false
})
}
// HasValue checks that a single produces the corresponding value.
func HasValue(value interface{}) Assertion {
return newAssertion(func(a *assertion) {
a.checkHasValue = true
a.hasValue = value
})
}
// HasRaisedError checks that a single raises the corresponding error.
func HasRaisedError(err error) Assertion {
return newAssertion(func(a *assertion) {
a.checkHasRaisedError = true
a.hasRaisedError = err
})
}
// HasRaisedAnError checks that a single raises an error.
func HasRaisedAnError() Assertion {
return newAssertion(func(a *assertion) {
a.checkHasRaisedAnError = true
})
}
// AssertThatObservable asserts the result of an Observable against a list of assertions.
func AssertThatObservable(t *testing.T, observable Observable, assertions ...Assertion) {
ass := parseAssertions(assertions...)
got := make([]interface{}, 0)
observable.Subscribe(handlers.NextFunc(func(i interface{}) {
got = append(got, i)
})).Block()
checkHasItems, items := ass.hasItemsFunc()
if checkHasItems {
assert.Equal(t, items, got)
}
checkHasSize, size := ass.hasSizeFunc()
if checkHasSize {
assert.Equal(t, size, len(got))
}
checkIsEmpty, empty := ass.isEmptyFunc()
if checkIsEmpty {
if empty {
assert.Equal(t, 0, len(got))
} else {
assert.NotEqual(t, 0, len(got))
}
}
}
// AssertThatSingle asserts the result of a Single against a list of assertions.
func AssertThatSingle(t *testing.T, single Single, assertions ...Assertion) {
ass := parseAssertions(assertions...)
v, err := single.Subscribe(nil).Block()
checkHasValue, value := ass.hasValueFunc()
if checkHasValue {
if err != nil {
assert.Fail(t, "error is not nil")
} else {
assert.Equal(t, value, v)
}
}
checkHasRaisedAnError := ass.hasRaisedAnErrorFunc()
if checkHasRaisedAnError {
assert.NotNil(t, err)
}
checkHasRaisedError, value := ass.hasRaisedErrorFunc()
if checkHasRaisedError {
assert.Equal(t, value, err)
}
}
// AssertThatOptionalSingle asserts the result of an OptionalSingle against a list of assertions.
func AssertThatOptionalSingle(t *testing.T, optionalSingle OptionalSingle, assertions ...Assertion) {
ass := parseAssertions(assertions...)
v, err := optionalSingle.Subscribe(nil).Block()
if err != nil {
assert.Fail(t, "error while retrieving OptionalSingle results")
}
if optional, ok := v.(optional.Optional); ok {
checkIsEmpty, empty := ass.isEmptyFunc()
if checkIsEmpty {
if empty {
assert.True(t, optional.IsEmpty())
} else {
assert.False(t, optional.IsEmpty())
}
}
got, emptyError := optional.Get()
checkHasRaisedAnError := ass.hasRaisedAnErrorFunc()
if checkHasRaisedAnError {
assert.Nil(t, emptyError)
assert.IsType(t, errors.New(""), got)
}
checkHasRaisedError, emptyError := ass.hasRaisedErrorFunc()
if checkHasRaisedError {
assert.Equal(t, emptyError, got)
}
checkHasValue, value := ass.hasValueFunc()
if checkHasValue {
assert.Equal(t, value, got)
}
} else {
assert.Fail(t, "OptionalSingle did not produce an Optional")
}
}