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// concurrent2
// Make the tests pass!
// I AM NOT DONE
package main_test
import (
"sync"
"testing"
)
func TestCounter(t *testing.T) {
counter := updateCounter()
if counter != 100 {
t.Errorf("Counter should be 100, but got %d", counter)
}
}
func updateCounter() int {
var counter int
var wg sync.WaitGroup
for i := 0; i < 100; i++ {
wg.Add(1)
go func() {
defer wg.Done()
counter++ // Many goroutines trying to update the counter? We need some protection here!
}()
}
wg.Wait()
return counter
}
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