英文:
Test a private method with a factory
问题
我是新手单元测试，正在为一个调用内部私有方法的方法创建单元测试。这个私有方法还调用了工厂中的一个函数。
private string FingerPrintCreator(string any)
{
using var calculator = mFingerprintCalculatorFactory.Create();
return calculator.Compute(any);
}
public string AnyFunction()
{
var fingerprint = FingerPrintCreator("xxxx");
return fingerprint + "YYY";
}
到目前为止，我有以下内容：
private class TestContext
{
public readonly Mock<IFingerprintCalculatorFactory> FingerprintCalculatorFactoryMock = new();
public TestContext()
{
FingerprintCalculatorFactoryMock.Setup(factory => factory.Create());
}
}
[Test]
public string Test_function()
{
string Any = "XXX";
var testContext = new TestContext();
testContext.FingerprintCalculatorFactoryMock.Setup(factory => factory.Create()).Returns(It.IsAny<IFingerprintCalculator>());
var result = await CreateProvider(testContext).AnyFunction;
}
在实例化CreateProvider后，我在return calculator.Compute(any);处得到System.NullReferenceException异常。
如何进行测试？任何建议将不胜感激。
英文:
I am new to Unit testing I am creating the unit tests for a method which calls a private method inside, this private method also calls a function from a factory
private string FingerPrintCreator(string any)
{
using var calculator = mFingerprintCalculatorFactory.Create();
return calculator.Compute(any);
}
public string AnyFunction()
{
var fingerprint=FingerPrintCreator("xxxx");
return fingerprint+"YYY";
}
so far I have:
private class TestContext
{
public readonly Mock<IFingerprintCalculatorFactory> FingerprintCalculatorFactoryMock = new();
public TestContext()
{
FingerprintCalculatorFactoryMock.Setup(factory => factory.Create());
}
}
[Test]
public string Test_function()
{
string Any = "XXX";
var testContext = new TestContext();
testContext.FingerprintCalculatorFactoryMock.Setup(factory => factory.Create()).Returns(It.IsAny<IFingerprintCalculator>());
var result = await CreateProvider(testContext).AnyFunction;
}
after CreateProvider is instantiated I get System.NullReferenceException at calculator from return calculator.Compute(any);
How can I test it? Any advice would be very appreciated
答案1
得分: 2
你需要更改你的设置，以返回一个实际的实例（或另一个模拟对象），而不是 It.IsAny<IFingerprintCalculator>()（It.IsAny<T> 返回一个 default(T)，在这种情况下是 null - Console.WriteLine(It.IsAny<IFingerprintCalculator>() is null); 会打印出 True)：
testContext.FingerprintCalculatorFactoryMock
.Setup(factory => factory.Create())
.Returns(new ....); // 或创建另一个模拟对象并返回它
英文:
You need to change your setup to return an actual instance (or another mock) instead of It.IsAny<IFingerprintCalculator>() (It.IsAny<T> returns a default(T) which is null in this case - Console.WriteLine(It.IsAny<IFingerprintCalculator>() is null); prints True):
testContext.FingerprintCalculatorFactoryMock
.Setup(factory => factory.Create())
.Returns(new ....); // or create another mock and return it
答案2
得分: 1
你不直接测试私有方法。你直接测试你的公有方法，它们会间接使用你的私有方法 - 因此你的私有方法会被间接测试。
英文:
You don't test private methods directly. You test your public methods directly and they will make use of your private methods - so your private methods will be tested indirectly.
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