1 files changed, 32 insertions, 0 deletions
diff --git a/exercises/concurrent/concurrent2/main_test.go b/exercises/concurrent/concurrent2/main_test.go
new file mode 100644
index 0000000..2233259
--- /dev/null
+++ b/exercises/concurrent/concurrent2/main_test.go
@@ -0,0 +1,32 @@
+// 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
+}