asan_fuzz_test.go

     1  package main
     2  
     3  import (
     4  	"slices"
     5  	"testing"
     6  )
     7  
     8  func Reverse(s string) string {
     9  	runes := []rune(s)
    10  	slices.Reverse(runes)
    11  	return string(runes)
    12  }
    13  
    14  // This fuzz test should quickly fail, because Reverse doesn't
    15  // work for strings that are not valid UTF-8.
    16  // What we are testing for is whether we see a failure from ASAN;
    17  // we should see a fuzzing failure, not an ASAN failure.
    18  
    19  func FuzzReverse(f *testing.F) {
    20  	f.Add("Go")
    21  	f.Add("Gopher")
    22  	f.Add("Hello, 世界")
    23  	f.Fuzz(func(t *testing.T, s string) {
    24  		r1 := Reverse(s)
    25  		r2 := Reverse(r1)
    26  		if s != r2 {
    27  			t.Errorf("got %q want %q", r2, s)
    28  		}
    29  	})
    30  }
    31
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