在JUnit4中使用参数化测试时,是否有一种方法可以设置我自己的自定义测试用例名称?

我想改变默认的-[测试类]. runtest [n] -有意义的东西。


当前回答

我大量使用静态导入的Assert和朋友,所以我很容易重新定义断言:

private <T> void assertThat(final T actual, final Matcher<T> expected) {
    Assert.assertThat(editThisToDisplaySomethingForYourDatum, actual, expected);
}

例如,您可以向您的测试类添加一个“name”字段,在构造函数中初始化,并在测试失败时显示它。只需将它作为每个测试参数数组的第一个元素传递进来。这也有助于标记数据:

public ExampleTest(final String testLabel, final int one, final int two) {
    this.testLabel = testLabel;
    // ...
}

@Parameters
public static Collection<Object[]> data() {
    return asList(new Object[][]{
        {"first test", 3, 4},
        {"second test", 5, 6}
    });
}

其他回答

由于所访问的参数(例如“{0}”总是返回toString()表示,一个解决方法是在每种情况下进行匿名实现并覆盖toString()。例如:

public static Iterable<? extends Object> data() {
    return Arrays.asList(
        new MyObject(myParams...) {public String toString(){return "my custom test name";}},
        new MyObject(myParams...) {public String toString(){return "my other custom test name";}},
        //etc...
    );
}

您可能还想尝试JUnitParams: https://github.com/Pragmatists/JUnitParams

在junit4.8.2中,您可以通过简单地复制Parameterized class来创建自己的MyParameterized类。更改TestClassRunnerForParameters中的getName()和testName()方法。

这些都不适合我,所以我得到了Parameterized的源代码,并修改了它,创建了一个新的测试运行器。我不需要改变太多,但它工作!!

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import org.junit.Assert;
import org.junit.internal.runners.ClassRoadie;
import org.junit.internal.runners.CompositeRunner;
import org.junit.internal.runners.InitializationError;
import org.junit.internal.runners.JUnit4ClassRunner;
import org.junit.internal.runners.MethodValidator;
import org.junit.internal.runners.TestClass;
import org.junit.runner.notification.RunNotifier;

public class LabelledParameterized extends CompositeRunner {
static class TestClassRunnerForParameters extends JUnit4ClassRunner {
    private final Object[] fParameters;

    private final String fParameterFirstValue;

    private final Constructor<?> fConstructor;

    TestClassRunnerForParameters(TestClass testClass, Object[] parameters, int i) throws InitializationError {
        super(testClass.getJavaClass()); // todo
        fParameters = parameters;
        if (parameters != null) {
            fParameterFirstValue = Arrays.asList(parameters).toString();
        } else {
            fParameterFirstValue = String.valueOf(i);
        }
        fConstructor = getOnlyConstructor();
    }

    @Override
    protected Object createTest() throws Exception {
        return fConstructor.newInstance(fParameters);
    }

    @Override
    protected String getName() {
        return String.format("%s", fParameterFirstValue);
    }

    @Override
    protected String testName(final Method method) {
        return String.format("%s%s", method.getName(), fParameterFirstValue);
    }

    private Constructor<?> getOnlyConstructor() {
        Constructor<?>[] constructors = getTestClass().getJavaClass().getConstructors();
        Assert.assertEquals(1, constructors.length);
        return constructors[0];
    }

    @Override
    protected void validate() throws InitializationError {
        // do nothing: validated before.
    }

    @Override
    public void run(RunNotifier notifier) {
        runMethods(notifier);
    }
}

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public static @interface Parameters {
}

private final TestClass fTestClass;

public LabelledParameterized(Class<?> klass) throws Exception {
    super(klass.getName());
    fTestClass = new TestClass(klass);

    MethodValidator methodValidator = new MethodValidator(fTestClass);
    methodValidator.validateStaticMethods();
    methodValidator.validateInstanceMethods();
    methodValidator.assertValid();

    int i = 0;
    for (final Object each : getParametersList()) {
        if (each instanceof Object[])
            add(new TestClassRunnerForParameters(fTestClass, (Object[]) each, i++));
        else
            throw new Exception(String.format("%s.%s() must return a Collection of arrays.", fTestClass.getName(), getParametersMethod().getName()));
    }
}

@Override
public void run(final RunNotifier notifier) {
    new ClassRoadie(notifier, fTestClass, getDescription(), new Runnable() {
        public void run() {
            runChildren(notifier);
        }
    }).runProtected();
}

private Collection<?> getParametersList() throws IllegalAccessException, InvocationTargetException, Exception {
    return (Collection<?>) getParametersMethod().invoke(null);
}

private Method getParametersMethod() throws Exception {
    List<Method> methods = fTestClass.getAnnotatedMethods(Parameters.class);
    for (Method each : methods) {
        int modifiers = each.getModifiers();
        if (Modifier.isStatic(modifiers) && Modifier.isPublic(modifiers))
            return each;
    }

    throw new Exception("No public static parameters method on class " + getName());
}

public static Collection<Object[]> eachOne(Object... params) {
    List<Object[]> results = new ArrayList<Object[]>();
    for (Object param : params)
        results.add(new Object[] { param });
    return results;
}
}

查看dsaff提到的JUnitParams,它使用ant在html报告中构建参数化测试方法描述。

这是在尝试LabelledParameterized并发现它虽然可以与eclipse一起工作,但就html报告而言,它不能与ant一起工作。

欢呼,