如何注入参数到TestNG类的构造函数？ [英] How to inject parameter into constructor of TestNG class?

问题描述

我已经实现了一个具有策略模式的程序。所以我有一个接口，在一些地方使用，具体的实现可以替换。

现在我想测试这个程序。我想以类似的方式做。编写一次测试，对接口进行测试。

我的测试类看起来和这个类似：

  public class MyTestClass {
 
 private StrategeyInterface strategy; 
 
 public MyTestClass（StrategeyInterface strategy）{
 this.strategy = strategy; 
} 
 ....使用策略的测试方法。 
} 
  

参数化构造器必须用于注入具体策略实现。测试。

现在我没有得到TestNG运行它并注入具体的实现实例。我试过几种方法与继承， @DataProvider ， @Factory 和相应的方法，但没有运气。 >

这里是testNG报告说的：

 无法调用public void MyClass.myTestMethod（）：使它静态或添加一个无参数的构造函数到你的类
  

使用maven surefire插件运行测试。下面是pom.xml的相关部分：

 < build> 
< plugins> 
< plugin> 
< groupId> org.apache.maven.plugins< / groupId> 
< artifactId> maven-surefire-plugin< / artifactId> 
< configuration> 
< suiteXmlFiles> 
< suiteXmlFile> src / test / resources / testng.xml< / suiteXmlFile> 
< / suiteXmlFiles> 
< / configuration> 
< / plugin> 
< / plugins> 
< / build> 
  

如何编写和运行测试，

提前感谢。

我可以提供更多的代码，我试过。我没有把它放在这里，但是，因为我尝试这么多变种，所以我现在困惑，所有的失败。

解决方案

您有几个选项。如果您使用的是Guice，请

如果没有，您可以使用工厂和数据提供者的混合：

  @Factory（dataProvider =dp）
 public FactoryDataProviderSampleTest（StrategyInterface si）{
} 
 $ b b @DataProvider 
 static public Object [] [] dp（）{
 return new Object [] [] {
 new Object [] {new Strategy1Impl（）}，
 new Object [] {new Strategy2Impl（）}，
}; 
} 
  

I have implemented a programm with the strategy pattern. So I have an interface which is used at some places and the concrete implementation may be replaced.

Now I want to test this programm. I would like to do it in a similar way. Write a test once, which tests against the interface. The concrete interface implementation should be injected at the beginning of the test, so that I may replace it easily.

My testclass looks similar to this one:

public class MyTestClass {

    private StrategeyInterface strategy;

    public MyTestClass(StrategeyInterface strategy) {
        this.strategy = strategy;
    }
    ....test methods using the strategy.
}

The parameterized contructor must used to be inject the concrete strategy implementation at thr beginning og the tests.

Now I did not get TestNG to run it and inject the concrete implementation instance. I tried several ways with inheritance, @DataProvider, @Factory and the corresponding methods, but without luck.

Here is what the testNG report says:

Can't invoke public void MyClass.myTestMethod(): either make it static or add a no-args constructor to your class

I use the maven surefire plugin to run the tests. Here is the relevant part of the pom.xml:

    <build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <configuration>
                <suiteXmlFiles>
                    <suiteXmlFile>src/test/resources/testng.xml</suiteXmlFile>
                </suiteXmlFiles>
            </configuration>
        </plugin>
    </plugins>
</build>

How do I write and run the tests, with injecting a concrete implementation into the test class?

Thanks in advance.

P.S. I could deliver more code I tried. I did not post it here, yet, because I tried so many variants so that I am kind of confused now and all of them fail.

解决方案

You have several options. If you are using Guice, here is a very straightforward way to inject your implementation.

If not, you can use a mix of factories and data provider:

@Factory(dataProvider = "dp")
public FactoryDataProviderSampleTest(StrategyInterface si) {
}

@DataProvider
static public Object[][] dp() {
  return new Object[][] {
    new Object[] { new Strategy1Impl() },
    new Object[] { new Strategy2Impl() },
  };
}

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