June 2021
Intermediate to advanced
335 pages
5h 50m
Chinese
Content preview from Kubernetes编程
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226
｜
第
8
章
}
}
这带来了我们想要实现的语义：“
foo
的默认值是
true
”。
这个使用指针的技巧对其他基础类型比如字符串类型也有效。对于
Map
和
数组，在无法区分
nil Map/
数组和空
Map/
数组时，很难做到双程转换。所
以
Kubernetes
里大多数
Map
和数组的默认值处理逻辑在两种情景下都会设
置默认值，以绕过编码和解码时的
Bug
。
8.4.7
双程测试
要把转换逻辑实现正确很困难。双程测试是一种有效的测试工具，通过在随
机测试中自动检测转换的结果是否符合预期（即在所有组版本之间来回转换
不丢失数据）来保证逻辑正确。
双程测试代码通常放在
install.go
文件中（例如
pkg/apis/restaurant/install/
roundtrip_test.go
）且直接在
API Machinery
中调用双程测试函数：
import (
...
"k8s.io/apimachinery/pkg/api/apitesting/roundtrip"
restaurantfuzzer "github.com/programming-kubernetes/pizza-apiserver/pkg/apis/
restaurant/fuzzer"
)
func TestRoundTripTypes(t *testing.T) {
roundtrip.RoundTripTestForAPIGroup(t, Install, restaurantfuzzer.Funcs)
}
在
RoundTripTestForAPIGroup ...
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