// Constructs an if-and-only-if/then matcher:
// matcher := IfAndOnlyIf(AntecedentMatcher).Then(ConsequentMatcher)
// that matches when both or neither of the Antecedent and the
// Consequent match. Note that this is logically equivalent to:
// Either(Not(AntecedentMatcher)).Xor(ConsequentMatcher)
// But may be more readable in practice.
func (self *IfAndOnlyIfClause) Then(consequent *base.Matcher) *base.Matcher {
antecedent := self.antecedent
match := func(actual interface{}) *base.Result {
result1 := antecedent.Match(actual)
result2 := consequent.Match(actual)
if result1.Matched() {
if result2.Matched() {
return base.NewResultf(true,
"Matched because both parts of 'Iff/Then' matched on [%v]", actual).
WithCauses(result1, result2)
}
return base.NewResultf(false,
"Failed because only the first part of 'Iff/Then' matched on [%v]", actual).
WithCauses(result1, result2)
}
if result2.Matched() {
return base.NewResultf(false,
"Failed because only the second part of 'IFf/Then' matched on [%v]", actual).
WithCauses(result1, result2)
}
return base.NewResultf(true,
"Matched because neither part of 'Iff/Then' matched on [%v]", actual).
WithCauses(result1, result2)
}
return base.NewMatcherf(match, "if and only if [%v] then [%v]", antecedent, consequent)
}
// Returns a matcher that matches on any array or slice input value
// if the given matcher matches every element of that array or slice.
//
// The returned matcher does not match any non-array-or-slice value.
func EachElem(matcher *base.Matcher) *base.Matcher {
match := func(actual interface{}) *base.Result {
v := reflect.NewValue(actual)
var value _ElemAndLen
var ok bool
value, ok = v.(*reflect.ArrayValue)
if !ok {
value, ok = v.(*reflect.SliceValue)
}
if !ok {
return base.NewResultf(false,
"Was not array or slice: was type %T", actual)
}
n := value.Len()
for i := 0; i < n; i++ {
elem := value.Elem(i).Interface()
result := matcher.Match(elem)
if !result.Matched() {
return base.NewResultf(false,
"Failed to match element %v of %v: %v",
i+1, n, elem).
WithCauses(result)
}
}
return base.NewResultf(true,
"Matched all of the %v elements", n)
}
return base.NewMatcherf(match, "EveryElement[%v]", matcher)
}
// Second part of a builder for an either/xor matcher:
// matcher := Either(matcher1).Xor(matcher2)
// This matcher matches when exactly one of the two matchers matches
// a given value; if both or neither of the matchers is successful,
// xor fails to match. Note that this is *never* a short-circuiting
// operation.
func (self *EitherClause) Xor(matcher2 *base.Matcher) *base.Matcher {
matcher1 := self.matcher
match := func(actual interface{}) *base.Result {
result1 := matcher1.Match(actual)
result2 := matcher2.Match(actual)
if result1.Matched() {
if result2.Matched() {
return base.NewResultf(false,
"both parts of 'Either/Xor' matched [%v]", actual).
WithCauses(result1, result2)
}
return base.NewResultf(true,
"only the first part of 'Either/Xor' matched [%v]", actual).
WithCauses(result1, result2)
}
if result2.Matched() {
return base.NewResultf(true,
"only the second part of 'Either/Xor' matched [%v]", actual).
WithCauses(result1, result2)
}
return base.NewResultf(false,
"neither part of 'Either/Xor' matched [%v]", actual).
WithCauses(result1, result2)
}
return base.NewMatcherf(match, "either [%v] xor [%v]", matcher1, matcher2)
}
func logSamples(t *testing.T, matcher *base.Matcher) {
t.Logf("Sample results for: %v\n", matcher)
we := asserter.Using(t)
for index, value := range sampleValues {
t.Logf("Sample #%v: %T[value: %v]\n", index+1, value, value)
we.LogResult(matcher.Match(value))
}
}
// Creates a new matcher that applies the given matcher to the result of
// converting an input string to uppercase (using strings.ToUpper).
// If the input value is not a string, the matcher fails to match.
func ToUpper(matcher *base.Matcher) *base.Matcher {
match := func(s string) *base.Result {
upper := strings.ToUpper(s)
result := matcher.Match(upper)
return base.NewResultf(result.Matched(),
"ToUpper is %v", upper).
WithCauses(result)
}
return base.NewMatcherf(match, "ToUpper(%v)", matcher)
}
// Creates a new matcher that applies the given matcher to the result of
// converting an input string its length. (using the `len()` builtin).
// If the input value is not a string, the matcher fails to match.
func ToLen(matcher *base.Matcher) *base.Matcher {
match := func(s string) *base.Result {
length := len(s)
result := matcher.Match(length)
return base.NewResultf(result.Matched(),
"length is %v", length).
WithCauses(result)
}
return base.NewMatcherf(match, "ToLen(%v)", matcher)
}
// Returns a new matcher that applies the type of its input
// element to the given matcher.
func ToType(matcher *base.Matcher) *base.Matcher {
match := func(actual interface{}) *base.Result {
actualType := reflect.Typeof(actual)
result := matcher.Match(actualType)
return base.NewResultf(result.Matched(),
"reflect.Typeof() returned %v", actualType).
WithCauses(result)
}
return base.NewMatcherf(match, "ToType(%v)", matcher)
}
func safeMatch(value interface{}, matcher *base.Matcher) (result *base.Result) {
defer func() {
if x := recover(); x != nil {
result = base.NewResultf(false, "Panic: %v", x).
WithMatcherAndValue(matcher, value)
}
}()
result = matcher.Match(value)
return
}
// Applies the given matcher to the length of the input element.
func ToLen(matcher *base.Matcher) *base.Matcher {
match := func(actual interface{}) *base.Result {
value := reflect.NewValue(actual)
if hasLen, ok := value.(_HasLen); ok {
length := hasLen.Len()
result := matcher.Match(length)
return base.NewResultf(result.Matched(), "Len() returned %v", length)
}
return base.NewResultf(false,
"Can't determine Len() for %T", actual)
}
return base.NewMatcherf(match, "ToLen[%v]", matcher)
}
// Returns a new matcher that, on any input that is a *reflect.SliceType,
// extracts the type of element and matches it against the given matcher.
//
// If the given input is not an *reflect.SliceType, this fails to match.
// Note: this matches slice *types*, not slices. (See SliceOf.)
func SliceTypeOf(elementTypeMatcher *base.Matcher) *base.Matcher {
match := func(actual interface{}) *base.Result {
if sliceType, ok := actual.(*reflect.SliceType); ok {
elementType := sliceType.Elem()
result := elementTypeMatcher.Match(elementType)
return base.NewResultf(
result.Matched(),
"was SliceType with elements of type %v", elementType.Name()).
WithCauses(result)
}
return base.NewResultf(false, "was of type %T, not a slice", actual)
}
return base.NewMatcherf(match, "SliceTypeOf(%v)", elementTypeMatcher)
}
// Returns a new matcher that, on any input that is an array, extracts
// its type and matches it against the given matcher.
//
// If the given input is not an array, this fails to match.
// Note: this matches *arrays*, not array *types*. (See ArrayTypeOf.)
func ArrayOf(elementTypeMatcher *base.Matcher) *base.Matcher {
match := func(actual interface{}) *base.Result {
actualType := reflect.Typeof(actual)
if arrayType, ok := actualType.(*reflect.ArrayType); ok {
elementType := arrayType.Elem()
result := elementTypeMatcher.Match(elementType)
return base.NewResultf(
result.Matched(),
"was array with elements of type %v", elementType).
WithCauses(result)
}
return base.NewResultf(false, "was of type %T, not an array", actual)
}
return base.NewMatcherf(match, "ArrayOf(%v)", elementTypeMatcher)
}
// Returns a new matcher that, on any input that is a channel, extracts
// its type and matches it against the given matcher.
//
// If the given input is not a channel, this fails to match.
// Note: this matches *channels*, not channel *types*. (See ChannelTypeOf.)
func ChannelOf(elementTypeMatcher *base.Matcher) *base.Matcher {
match := func(actual interface{}) *base.Result {
actualType := reflect.Typeof(actual)
if channelType, ok := actualType.(*reflect.ChanType); ok {
elementType := channelType.Elem()
result := elementTypeMatcher.Match(elementType)
return base.NewResultf(result.Matched(),
"was channel with elements of type %v",
elementType).
WithCauses(result)
}
return base.NewResultf(false, "was of type %T, not a channel", actual)
}
return base.NewMatcherf(match, "ChannelOf(%v)", elementTypeMatcher)
}
// Returns a new matcher that, on any input that is a pointer, extracts the
// type of object that it thinks it's pointing to (the "pointee") and
// matches it against the given matcher.
//
// If the given input is not an pointer, this fails to match.
// Note: this matches *pointers*, not pointer *types*. (See PtrTypeTo.)
func PtrTo(pointeeTypeMatcher *base.Matcher) *base.Matcher {
match := func(actual interface{}) *base.Result {
actualType := reflect.Typeof(actual)
if ptrType, ok := actualType.(*reflect.PtrType); ok {
elementType := ptrType.Elem()
result := pointeeTypeMatcher.Match(elementType)
return base.NewResultf(
result.Matched(), "was PtrType to type %v", elementType).
WithCauses(result)
}
return base.NewResultf(false,
"was type %T, not a pointer", actual)
}
return base.NewMatcherf(match,
"PtrTo(%v)", pointeeTypeMatcher)
}
// Applies the given matcher to the result of writing the input object's
// to a string by using fmt.Sprintf("%#v", object).
func ToGoString(matcher *base.Matcher) *base.Matcher {
match := func(actual interface{}) *base.Result {
if gostringer, ok := actual.(fmt.GoStringer); ok {
s := gostringer.GoString()
result := matcher.Match(s)
return base.NewResultf(result.Matched(),
"GoString() returned %v", s).
WithCauses(result)
}
s := fmt.Sprintf("%#v", actual)
result := matcher.Match(s)
return base.NewResultf(result.Matched(),
"Not a fmt.GoStringer, but prints as %v", s).
WithCauses(result)
}
return base.NewMatcherf(match, "ToGoString(%v)", matcher)
}
// Creates a matcher that passes when neither this matcher nor the
// other matcher pass. This operation is short-circuiting, so that
// if the first matcher matches, the second is not attempted.
// Note that this is logically equivalent to:
// Both(Not(matcher1)).And(Not(matcher2))
// But may be more readable in practice.
func (self *NeitherClause) Nor(matcher2 *base.Matcher) *base.Matcher {
matcher1 := self.matcher
match := func(actual interface{}) *base.Result {
result1 := matcher1.Match(actual)
if result1.Matched() {
return base.NewResultf(false,
"first part of 'Nor' matched [%v]", actual).
WithCauses(result1)
}
result2 := matcher2.Match(actual)
if result2.Matched() {
return base.NewResultf(false,
"second part of 'Nor' matched [%v]", actual).
WithCauses(result2)
}
return base.NewResultf(true,
"neither part of 'Nor' matched [%v]", actual).
WithCauses(result1, result2)
}
return base.NewMatcherf(match, "neither [%v] nor [%v]", matcher1, matcher2)
}
// Second part of a builder for a short-circuiting both/and matcher.
func (self *BothClause) And(matcher2 *base.Matcher) *base.Matcher {
matcher1 := self.matcher
match := func(actual interface{}) *base.Result {
result1 := matcher1.Match(actual)
if !result1.Matched() {
return base.NewResultf(false,
"first part of 'Both/And' did not match [%v]", actual).
WithCauses(result1)
}
result2 := matcher2.Match(actual)
if !result2.Matched() {
return base.NewResultf(false,
"second part of 'Both/And' did not match [%v]", actual).
WithCauses(result2)
}
return base.NewResultf(true,
"both parts of 'Both/And' matched [%v]", actual).
WithCauses(result1, result2)
}
return base.NewMatcherf(match, "both [%v] and [%v]", matcher1, matcher2)
}
// Returns a matcher that matches on any array or slice input value
// if the given matcher matches at least one element of that array
// or slice.
//
// The returned matcher does not match any non-array-or-slice value.
func AnyElem(matcher *base.Matcher) *base.Matcher {
match := func(actual interface{}) *base.Result {
v := reflect.NewValue(actual)
if value, ok := v.(_ElemAndLen); ok {
n := value.Len()
for i := 0; i < n; i++ {
elem := value.Elem(i).Interface()
result := matcher.Match(elem)
if result.Matched() {
return base.NewResultf(true,
"Matched element %v of %v: %v", i+1, n, elem).
WithCauses(result)
}
}
return base.NewResultf(false,
"Matched none of the %v elements", n)
}
return matcher.Match(v)
}
return base.NewMatcherf(match, "AnyElement[%v]", matcher)
}
// Constructs a short-circuiting if/then matcher:
// matcher := If(AntecedentMatcher).Then(ConsequentMatcher)
// such that the consequent is only tested when the antecedent
// matches, and the resulting matcher only fails to match when the
// consequent fails to match. Note that this is logically
// equivalent to:
// Either(Not(AntecedentMatcher)).Or(ConsequentMatcher)
// But may be more readable in practice.
func (self *IfClause) Then(consequent *base.Matcher) *base.Matcher {
antecedent := self.antecedent
match := func(actual interface{}) *base.Result {
result1 := antecedent.Match(actual)
if !result1.Matched() {
return base.NewResultf(true,
"'If/Then' matched because antecedent failed on [%v]", actual).
WithCauses(result1)
}
result2 := consequent.Match(actual)
if result2.Matched() {
return base.NewResultf(true,
"'If/Then' matched because consequent matched on [%v]", actual).
WithCauses(result2)
}
return base.NewResultf(false,
"'If/Then' failed on [%v]", actual).
WithCauses(result1, result2)
}
return base.NewMatcherf(match,
"if [%v] then [%v]", antecedent, consequent)
}
// Returns a new matcher that, on any input that is a *reflect.MapType,
// extracts the type of keys and element and matches them against two
// given matchers.
//
// If the given input is not an *reflect.MapType, this fails to match.
// Note: this matches map *types*, not maps. (See MapOf.)
func MapTypeOf(keyTypeMatcher, elementTypeMatcher *base.Matcher) *base.Matcher {
match := func(actual interface{}) *base.Result {
if mapType, ok := actual.(*reflect.MapType); ok {
keyType := mapType.Key()
elementType := mapType.Elem()
keyResult := keyTypeMatcher.Match(keyType)
if !keyResult.Matched() {
return base.NewResultf(false,
"was MapType with keys of type %v", keyType).
WithCauses(keyResult)
}
elementResult := elementTypeMatcher.Match(elementType)
return base.NewResultf(elementResult.Matched(),
"was MapType with keys/elements of type %v/%v",
keyType, elementType).
WithCauses(keyResult, elementResult)
}
return base.NewResultf(false, "was of type %T, not a MapType", actual)
}
return base.NewMatcherf(match,
"MapTypeOf(%v, %v)", keyTypeMatcher, elementTypeMatcher)
}
func checkMatcherIsNonMatchingOnNils(t *testing.T, matcher *base.Matcher) {
checkResultIsNonMatching(t, matcher.Match(nil), "nil")
checkResultIsNonMatching(t, matcher.Match(uninitialized._pointer), "uninitialized pointer")
checkResultIsNonMatching(t, matcher.Match(uninitialized._func), "uninitialized func")
checkResultIsNonMatching(t, matcher.Match(uninitialized._slice), "uninitialized slice")
checkResultIsNonMatching(t, matcher.Match(uninitialized._chan), "uninitialized chan")
checkResultIsNonMatching(t, matcher.Match(uninitialized._map), "uninitialized map")
checkResultIsNonMatching(t, matcher.Match(uninitialized._interface), "uninitialized interface")
}
func logSamples(t *testing.T, matcher *base.Matcher) {
t.Logf("Sample results for: %v\n", matcher)
t.Logf("\ton true: %v\n", matcher.Match(true))
t.Logf("\ton false: %v\n", matcher.Match(false))
t.Logf("\ton int: %v\n", matcher.Match(42))
t.Logf("\ton uint: %v\n", matcher.Match(uint(42)))
t.Logf("\ton float: %v\n", matcher.Match(42.0))
t.Logf("\ton string: %v\n", matcher.Match("foobar"))
t.Logf("\ton struct: %v\n", matcher.Match(struct{ Field int }{Field: 42}))
t.Logf("\ton type: %v\n", matcher.Match(reflect.Typeof(uninitialized)))
t.Logf("\ton channel: %v\n", matcher.Match(make(chan int, 1)))
t.Logf("\ton function: %v\n", matcher.Match(func() int { return 1 }))
t.Logf("\ton function: %v\n", matcher.Match(interface{}(nil)))
t.Logf("\ton map: %v\n", matcher.Match(map[int]string{1: "one", 2: "two"}))
t.Logf("\ton pointer: %v\n", matcher.Match(&struct{ Field int }{Field: 42}))
t.Logf("\ton slice: %v\n", matcher.Match([]int{1}))
t.Logf("\ton nil: %v\n", matcher.Match(nil))
t.Logf("\ton nil channel: %v\n", matcher.Match(uninitialized._chan))
t.Logf("\ton nil function: %v\n", matcher.Match(uninitialized._func))
t.Logf("\ton nil interface: %v\n", matcher.Match(uninitialized._interface))
t.Logf("\ton nil map: %v\n", matcher.Match(uninitialized._map))
t.Logf("\ton nil pointer: %v\n", matcher.Match(uninitialized._pointer))
t.Logf("\ton nil slice: %v\n", matcher.Match(uninitialized._slice))
}
func checkMatcherIsNonMatchingOnNils(t *testing.T, matcher *base.Matcher) {
we := asserter.Using(t)
we.CheckThat(matcher.Match(nil), DidNotMatch.Comment("nil"))
we.CheckThat(matcher.Match(uninitialized._pointer), DidNotMatch.Comment("uninitialized pointer"))
we.CheckThat(matcher.Match(uninitialized._func), DidNotMatch.Comment("uninitialized func"))
we.CheckThat(matcher.Match(uninitialized._slice), DidNotMatch.Comment("uninitialized slice"))
we.CheckThat(matcher.Match(uninitialized._chan), DidNotMatch.Comment("uninitialized chan"))
we.CheckThat(matcher.Match(uninitialized._map), DidNotMatch.Comment("uninitialized map"))
we.CheckThat(matcher.Match(uninitialized._interface), DidNotMatch.Comment("uninitialized interface"))
}
