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testing: examples do not always capture stdout #12348

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alexcesaro opened this issue Aug 26, 2015 · 3 comments

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@alexcesaro
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commented Aug 26, 2015

Examples do not capture stdout when os.Stdout is assigned to a variable outside the example body:

// foo_test.go
package foo

import "os"

var f = os.Stdout

func Example() {
    f.WriteString("a")
    // Output:
    // a
}
$ go test
a--- FAIL: Example (0.00s)
got:

want:
a
FAIL
exit status 1
@minux

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commented Aug 26, 2015

@gopherbot

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commented Aug 26, 2015

CL https://golang.org/cl/13927 mentions this issue.

@ianlancetaylor

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commented Aug 27, 2015

It doesn't work, so, don't do that. Examples are a convenience feature for documentation, not something that has to work no matter what the program does.

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