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Filename : test_flag.txt

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go test flag_test.go -v -args -v=7 # Two distinct -v flags
go test -v flag_test.go -args -v=7 # Two distinct -v flags

# Using a custom flag mixed with regular 'go test' flags should be OK.
go test -count=1 -custom -args -v=7

# However, it should be an error to use custom flags when -c is used,
# since we know for sure that no test binary will run at all.
! go test -c -custom
stderr '^go: unknown flag -custom cannot be used with -c$'

# The same should apply even if -c comes after a custom flag.
! go test -custom -c
stderr '^go: unknown flag -custom cannot be used with -c$'

-- go.mod --
module m
-- flag_test.go --
package flag_test

import (
	"flag"
	"log"
	"testing"
)

var v = flag.Int("v", 0, "v flag")

var custom = flag.Bool("custom", false, "")

// Run this as go test pkg -v=7
func TestVFlagIsSet(t *testing.T) {
	if *v != 7 {
		log.Fatal("v flag not set")
	}
}