good good study, day day up!

vendor/gopl.io/ch9/bank1/bank_test.go

@@ -0,0 +1,36 @@
+// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+package bank_test
+
+import (
+	"fmt"
+	"testing"
+
+	"gopl.io/ch9/bank1"
+)
+
+func TestBank(t *testing.T) {
+	done := make(chan struct{})
+
+	// Alice
+	go func() {
+		bank.Deposit(200)
+		fmt.Println("=", bank.Balance())
+		done <- struct{}{}
+	}()
+
+	// Bob
+	go func() {
+		bank.Deposit(100)
+		done <- struct{}{}
+	}()
+
+	// Wait for both transactions.
+	<-done
+	<-done
+
+	if got, want := bank.Balance(), 300; got != want {
+		t.Errorf("Balance = %d, want %d", got, want)
+	}
+}