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archive/zip: possibly useless test #28700

ainar-g opened this Issue Nov 9, 2018 · 0 comments


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ainar-g commented Nov 9, 2018

While playing around with the new vet and its nilness check, I have found an interesting bug. In src/archive/zip/reader_test.go:985 we have a test for #10956, but the test doesn't actually check anything:

_, err := NewReader(bytes.NewReader(data), int64(len(data)))
if err == nil && !strings.Contains(err.Error(), want) {
	t.Errorf("error = %v; want %q", err, want)

It should obviously be if err != nil && … here. But when I changed it, the test failed, because it returned ErrFormat instead of the custom Errorf'd error that was expected. I ran all of the package zip's tests with -cover and the coverage profile shows that the branch in (*Reader).init is never taken.

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