1 files changed, 24 insertions, 0 deletions
diff --git a/src/flag/export_test.go b/src/flag/export_test.go
new file mode 100644
index 0000000..9ef93ed
--- /dev/null
+++ b/src/flag/export_test.go
@@ -0,0 +1,24 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package flag
+
+import (
+	"io"
+	"os"
+)
+
+// Additional routines compiled into the package only during testing.
+
+var DefaultUsage = Usage
+
+// ResetForTesting clears all flag state and sets the usage function as directed.
+// After calling ResetForTesting, parse errors in flag handling will not
+// exit the program.
+func ResetForTesting(usage func()) {
+	CommandLine = NewFlagSet(os.Args[0], ContinueOnError)
+	CommandLine.SetOutput(io.Discard)
+	CommandLine.Usage = commandLineUsage
+	Usage = usage
+}