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[dev.fuzz] internal/fuzz: write a newline to the end of a corpus file

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If someone manually adds/alters a corpus file to add
extra spacing or remove the final newline, the file
can still be decoded. However, this change ensures that
the fuzzing engine correctly writes the final newline.

Fixes golang/go#48130

Change-Id: Ib5556d4a6e4e0bfd9bc2edab357b7c25bedfd176
Reviewed-on: https://go-review.googlesource.com/c/go/+/349055
Trust: Katie Hockman <katie@golang.org>
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
This commit is contained in:
Katie Hockman 2021-09-10 11:05:29 -04:00
parent 363f2f3df9
commit d106089fa6
3 changed files with 23 additions and 12 deletions
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20
src/internal/fuzz/encoding_test.go
View file

@ -66,16 +66,21 @@ byte('☃')`,
},
{
in: `go test fuzz v1
string("has final newline")
`,
ok: true, // has final newline
},
{
in: `go test fuzz v1
string("extra")
[]byte("spacing")
`,
ok: true,
ok: true, // extra spaces in the final newline
},
{
in: `go test fuzz v1
float64(0)
float32(0)
`,
float32(0)`,
ok: true, // will be an integer literal since there is no decimal
},
{
@ -114,9 +119,12 @@ float32(2.5)`,
if err != nil {
t.Fatalf("marshal unexpected error: %v", err)
}
want := strings.TrimSpace(test.in)
if want != string(newB) {
t.Errorf("values changed after unmarshal then marshal\nbefore: %q\nafter: %q", want, newB)
if newB[len(newB)-1] != '\n' {
t.Error("didn't write final newline to corpus file")
}
before, after := strings.TrimSpace(test.in), strings.TrimSpace(string(newB))
if before != after {
t.Errorf("values changed after unmarshal then marshal\nbefore: %q\nafter: %q", before, after)
}
})
}