在测试中访问 private static 属性 in static class

Question

是否可以在测试用例中访问 $measurements 属性？

class Performance
{
    private static $measurements = [];

    public static function createMeasurement()
    {
        // ...
    }
}

到目前为止，我尝试过这样的事情：

$reflection = new \ReflectionClass(get_class(Performance));
$property = $reflection->getProperty('measurements');
$property->setAccessible(true);

但这行不通，因为Use of undefined constant Performance - assumed 'Performance'。我如何告诉 php 从静态 class 中获取对象？

Answer 1

get_class 接受一个对象作为参数，所以制作一个并传递它

$p = new Performance;

$reflection = new \ReflectionClass(get_class($p)); // or
// $reflection = new \ReflectionClass('Performance'); // without get_class

$property = $reflection->getProperty('measurements');
$property->setAccessible(true);
var_dump($property);
var_dump($property->getValue($p));

会输出

object(ReflectionProperty)#3 (2) {
  ["name"]=>
  string(12) "measurements"
  ["class"]=>
  string(11) "Performance"
}

// my property is an array [1,2,3]
array(3) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
}

同样在您的 class 中，您需要正确定义 createMeasurement 函数

private static function createMeasurement(){
                 ^^

Answer 2

试试这个：

$reflectionProperty = new ReflectionProperty('Performance', 'measurements');
$reflectionProperty->setAccessible(true);
echo $reflectionProperty->getValue();

Answer 3

您还可以在 class 范围内使用 closures. You just need to bind 访问私有属性。

$getMeasurements = function() { return static::$measurements; };
$getPerformanceMeasurements = $getMeasurements->bindTo(null, Performance::class);

$measurements = $getPerformanceMeasurements();

在测试中访问 private static 属性 in static class

Access private static property in static class in test

php

phpunit