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testing: document example with unordered output

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Copy the documentation and example from cmd/go.

Fixes #18840.

Change-Id: Id8022762b48576fb4031de05287d07a6ed23f480
Reviewed-on: https://go-review.googlesource.com/37440
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Alexander Döring 2017-04-10 20:57:45 +02:00 • committed by Brad Fitzpatrick
parent 98a9aeb009
commit 44bd39c3a4
1 changed files with 21 additions and 7 deletions
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28
src/testing/testing.go
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@ -83,16 +83,30 @@
// ignores leading and trailing space.) These are examples of an example:
//
// func ExampleHello() {
// fmt.Println("hello")
// // Output: hello
// fmt.Println("hello")
// // Output: hello
// }
//
// func ExampleSalutations() {
// fmt.Println("hello, and")
// fmt.Println("goodbye")
// // Output:
// // hello, and
// // goodbye
// fmt.Println("hello, and")
// fmt.Println("goodbye")
// // Output:
// // hello, and
// // goodbye
// }
//
// The comment prefix "Unordered output:" is like "Output:", but matches any
// line order:
//
// func ExamplePerm() {
// for _, value := range Perm(4) {
// fmt.Println(value)
// }
// // Unordered output: 4
// // 2
// // 1
// // 3
// // 0
// }
//
// Example functions without output comments are compiled but not executed.