mirror of https://github.com/hashicorp/consul
90 lines
2.3 KiB
Markdown
90 lines
2.3 KiB
Markdown
gofuzz
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======
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gofuzz is a library for populating go objects with random values.
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[](https://godoc.org/github.com/google/gofuzz)
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[](https://travis-ci.org/google/gofuzz)
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This is useful for testing:
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* Do your project's objects really serialize/unserialize correctly in all cases?
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* Is there an incorrectly formatted object that will cause your project to panic?
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Import with ```import "github.com/google/gofuzz"```
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You can use it on single variables:
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```go
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f := fuzz.New()
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var myInt int
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f.Fuzz(&myInt) // myInt gets a random value.
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```
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You can use it on maps:
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```go
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f := fuzz.New().NilChance(0).NumElements(1, 1)
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var myMap map[ComplexKeyType]string
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f.Fuzz(&myMap) // myMap will have exactly one element.
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```
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Customize the chance of getting a nil pointer:
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```go
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f := fuzz.New().NilChance(.5)
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var fancyStruct struct {
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A, B, C, D *string
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}
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f.Fuzz(&fancyStruct) // About half the pointers should be set.
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```
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You can even customize the randomization completely if needed:
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```go
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type MyEnum string
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const (
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A MyEnum = "A"
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B MyEnum = "B"
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)
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type MyInfo struct {
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Type MyEnum
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AInfo *string
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BInfo *string
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}
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f := fuzz.New().NilChance(0).Funcs(
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func(e *MyInfo, c fuzz.Continue) {
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switch c.Intn(2) {
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case 0:
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e.Type = A
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c.Fuzz(&e.AInfo)
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case 1:
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e.Type = B
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c.Fuzz(&e.BInfo)
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}
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},
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)
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var myObject MyInfo
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f.Fuzz(&myObject) // Type will correspond to whether A or B info is set.
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```
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See more examples in ```example_test.go```.
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You can use this library for easier [go-fuzz](https://github.com/dvyukov/go-fuzz)ing.
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go-fuzz provides the user a byte-slice, which should be converted to different inputs
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for the tested function. This library can help convert the byte slice. Consider for
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example a fuzz test for a the function `mypackage.MyFunc` that takes an int arguments:
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```go
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// +build gofuzz
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package mypackage
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import fuzz "github.com/google/gofuzz"
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func Fuzz(data []byte) int {
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var i int
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fuzz.NewFromGoFuzz(data).Fuzz(&i)
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MyFunc(i)
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return 0
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}
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```
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Happy testing!
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