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testing: examples do not always capture stdout #12348

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testing: examples do not always capture stdout#12348
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@alexcesaro
alexcesaro
opened on 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

Activity

  1. minux commented on Aug 26, 2015

    @minux
    minux
    on Aug 26, 2015 via email
    Member

  2. gopherbot commented on Aug 26, 2015

    @gopherbot
    gopherbot
    on Aug 26, 2015
    Contributor

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

  3. ianlancetaylor commented on Aug 27, 2015

    @ianlancetaylor
    ianlancetaylor
    on Aug 27, 2015
    Contributor

    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.

  4. ianlancetaylor
    closed this as completedon Aug 27, 2015
  5. golang
    locked and limited conversation to collaborators on Sep 4, 2016
  6. gopherbot
    added
    FrozenDueToAge
    on Sep 4, 2016
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