如何使用Golang测试结构体方法

<span style="color:blue;">package</span> main

<span style="color:blue;">type</span> Account <span style="color:blue;">struct</span> {
    balance <span style="color:blue;">float64</span>
}

<span style="color:blue;">func</span> (a *Account) Deposit(amount <span style="color:blue;">float64</span>) {
    <span style="color:blue;">if</span> amount > 0 {
        a.balance += amount
    }
}

<span style="color:blue;">func</span> (a *Account) Balance() <span style="color:blue;">float64</span> {
    <span style="color:blue;">return</span> a.balance
}

<span style="color:blue;">package</span> main

<span style="color:blue;">import</span> (
    "testing"
)

<span style="color:blue;">func</span> TestAccount_Deposit(t *testing.T) {
    acc := &Account{balance: 100}
    acc.Deposit(50)

    <span style="color:blue;">if</span> acc.Balance() != 150 {
        t.Errorf("期望余额 150，实际 %f", acc.Balance())
    }

    <span style="color:blue;">// 测试非法存款
    acc.Deposit(-10)
    <span style="color:blue;">if</span> acc.Balance() != 150 {
        t.Errorf("负数存款不应修改余额，当前余额 %f", acc.Balance())
    }
}
</span>

go test -v

<span style="color:blue;">func</span> (a Account) String() <span style="color:blue;">string</span> {
    <span style="color:blue;">return</span> fmt.Sprintf("余额: %.2f", a.balance)
}

<span style="color:blue;">func</span> TestAccount_String(t *testing.T) {
    acc := &Account{balance: 99.5}
    expected := "余额: 99.50"
    <span style="color:blue;">if</span> acc.String() != expected {
        t.Errorf("期望 %q，实际 %q", expected, acc.String())
    }
}