env GO111MODULE=off

! go fmt does-not-exist

go fmt -n exclude
stdout 'exclude[/\\]x\.go'
stdout 'exclude[/\\]x_linux\.go'

# Test edge cases with gofmt.

! exec $GOROOT/bin/gofmt does-not-exist

exec $GOROOT/bin/gofmt gofmt-dir/no-extension
stdout 'package x'

exec $GOROOT/bin/gofmt gofmt-dir
! stdout 'package x'

! exec $GOROOT/bin/gofmt empty.go nopackage.go
stderr -count=1 'empty\.go:1:1: expected .package., found .EOF.'
stderr -count=1 'nopackage\.go:1:1: expected .package., found not'

-- exclude/empty/x.txt --
-- exclude/ignore/_x.go --
package x
-- exclude/x.go --
// +build linux,!linux

package x
-- exclude/x_linux.go --
// +build windows

package x
-- gofmt-dir/no-extension --
package x
-- empty.go --
-- nopackage.go --
not the proper start to a Go file