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8893175c3b
A few of the tests were printing garbage to stderr, since FlagSet's default Output is os.Stderr: $ go test flag provided but not defined: -x invalid value "1" for flag -v: test error Usage of test: flag needs an argument: -b Usage of test: -b usage PASS ok flag 0.008s Add the remaining SetOutput(io.Discard) method calls. Note that TestUserDefinedFunc was a tricky one. Even with the added SetOutput calls, the last part of the test would still print usage text to stderr. It took me a while to figure out the problem was copying FlagSet. I've filed go.dev/issue/51507 to record this particular sharp edge, and the test code now avoids making FlagSet copies to avoid the bug. Change-Id: I323f24091b98386312aa72df3eb890af6625628d Reviewed-on: https://go-review.googlesource.com/c/go/+/390234 Trust: Daniel Martí <mvdan@mvdan.cc> Run-TryBot: Daniel Martí <mvdan@mvdan.cc> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
25 lines
653 B
Go
25 lines
653 B
Go
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package flag
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import (
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"io"
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"os"
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)
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// Additional routines compiled into the package only during testing.
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var DefaultUsage = Usage
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// ResetForTesting clears all flag state and sets the usage function as directed.
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// After calling ResetForTesting, parse errors in flag handling will not
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// exit the program.
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func ResetForTesting(usage func()) {
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CommandLine = NewFlagSet(os.Args[0], ContinueOnError)
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CommandLine.SetOutput(io.Discard)
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CommandLine.Usage = commandLineUsage
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Usage = usage
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}
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