JUnit中是否有任何注释要在参数化测试类中排除非参数测试？
答案 0 :(得分：51)
从Junit 5.0.0开始，您现在可以使用@ParameterizedTest注释您的测试方法。所以不需要内部课程。除了ValueSource之外，还有很多方法可以为参数化测试提供参数，如下所示。有关详细信息，请参阅official junit user guide：
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.ParameterizedTest;
import org.junit.jupiter.params.provider.ValueSource;
public class ComponentTest {
@ParameterizedTest
@ValueSource(strings = { "racecar", "radar", "able was I ere I saw elba" })
public void testCaseUsingParams(String candidate) throws Exception {
}
@Test
public void testCaseWithoutParams() throws Exception {
}
}
如果您仍在使用Junit 4（我使用v4.8.2测试过），您可以将Enclosed runner与内部类和参数化跑步者结合使用：
import org.junit.Test;
import org.junit.experimental.runners.Enclosed;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
@RunWith(Enclosed.class)
public class ComponentTest {
@RunWith(Parameterized.class)
public static class ComponentParamTests {
@Parameters
...
@Test
public void testCaseUsingParams() throws Exception {
}
}
public static class ComponentSingleTests {
@Test
public void testCaseWithoutParams() throws Exception {
}
}
}
答案 1 :(得分：12)
我just found out可以使用JUnitParams。 我现在转换了我的一个测试来使用它并且它的工作非常好。
答案 2 :(得分：6)
没有。最佳实践是将这些非参数化测试移动到不同的类（.java文件）
答案 3 :(得分：2)
Zohhak test runner是一种参数化特定测试的简单方法。 谢谢Piotr！
答案 4 :(得分：2)
我能够做一些非常类似于Matthew Madson的回答，并发现创建一个Base Class来封装单一和param测试之间的设置和公共帮助函数很有用。这不使用 Enclosed.class 。
@RunWith(Suite.class)
@SuiteClasses({ComponentTest.ComponentParamTests.class, ComponentTest.ComponentSingleTests.class})
public class ComponentTest {
public static class TestBase {
@Spy
...
@Before
...
}
@RunWith(Parameterized.class)
public static class ComponentParamTests extends TestBase{
@Parameter
...
@Parameters
...
@Test
...
}
public static class ComponentSingleTests extends TestBase{
@Test
...
}
}
答案 5 :(得分：0)
似乎是TestNG does not suffer from this problem。 我不是那么绝望所以我修改了内置的Parameterized类来支持这个功能。只需将适用的测试注释为@NonParameterized。 请注意，此类仅适用于注释，即检查导入。
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.junit.Test;
import org.junit.runner.Runner;
import org.junit.runner.notification.RunNotifier;
import org.junit.runners.BlockJUnit4ClassRunner;
import org.junit.runners.Suite;
import org.junit.runners.model.FrameworkMethod;
import org.junit.runners.model.InitializationError;
import org.junit.runners.model.Statement;
import org.junit.runners.model.TestClass;
/**
* <p>
* The custom runner <code>Parameterized</code> implements parameterized tests.
* When running a parameterized test class, instances are created for the
* cross-product of the test methods and the test data elements.
* </p>
* For example, to test a Fibonacci function, write:
*
* <pre>
* @RunWith(Parameterized.class)
* public class FibonacciTest {
* @Parameters
* public static List<Object[]> data() {
* return Arrays.asList(new Object[][] {
* Fibonacci,
* { {0, 0}, {1, 1}, {2, 1}, {3, 2}, {4, 3}, {5, 5},
* {6, 8}}});
* }
*
* private int fInput;
*
* private int fExpected;
*
* public FibonacciTest(int input, int expected) {
* fInput = input;
* fExpected = expected;
* }
*
* @Test
* public void test() {
* assertEquals(fExpected, Fibonacci.compute(fInput));
* }
* }
* </pre>
* <p>
* Each instance of <code>FibonacciTest</code> will be constructed using the
* two-argument constructor and the data values in the
* <code>@Parameters</code> method.
* </p>
*/
public class Parameterized extends Suite {
/**
* Annotation for a method which provides parameters to be injected into the
* test class constructor by <code>Parameterized</code>
*/
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public static @interface Parameters {
}
/**
* Annotation for a methods which should not be parameterized
*/
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public static @interface NonParameterized {
}
private class TestClassRunnerForParameters extends
BlockJUnit4ClassRunner {
private final int fParameterSetNumber;
private final List<Object[]> fParameterList;
TestClassRunnerForParameters(Class<?> type,
List<Object[]> parameterList, int i) throws InitializationError {
super(type);
fParameterList = parameterList;
fParameterSetNumber = i;
}
@Override
public Object createTest() throws Exception {
return getTestClass().getOnlyConstructor().newInstance(
computeParams());
}
private Object[] computeParams() throws Exception {
try {
return fParameterList.get(fParameterSetNumber);
} catch (ClassCastException e) {
throw new Exception(String.format(
"%s.%s() must return a Collection of arrays.",
getTestClass().getName(), getParametersMethod(
getTestClass()).getName()));
}
}
@Override
protected String getName() {
return String.format("[%s]", fParameterSetNumber);
}
@Override
protected String testName(final FrameworkMethod method) {
return String.format("%s[%s]", method.getName(),
fParameterSetNumber);
}
@Override
protected void validateConstructor(List<Throwable> errors) {
validateOnlyOneConstructor(errors);
}
@Override
protected Statement classBlock(RunNotifier notifier) {
return childrenInvoker(notifier);
}
@Override
protected List<FrameworkMethod> computeTestMethods() {
List<FrameworkMethod> ret = super.computeTestMethods();
for (Iterator<FrameworkMethod> i = ret.iterator(); i.hasNext();) {
FrameworkMethod frameworkMethod =
(FrameworkMethod) i.next();
if (isParameterized() ^
!frameworkMethod.getMethod().isAnnotationPresent(
NonParameterized.class)) {
i.remove();
}
}
return ret;
}
protected boolean isParameterized() {
return true;
}
}
private class TestClassRunnerForNonParameterized extends
TestClassRunnerForParameters {
TestClassRunnerForNonParameterized(Class<?> type,
List<Object[]> parameterList, int i)
throws InitializationError {
super(type, parameterList, i);
}
protected boolean isParameterized() {
return false;
}
}
private final ArrayList<Runner> runners = new ArrayList<Runner>();
/**
* Only called reflectively. Do not use programmatically.
*/
public Parameterized(Class<?> klass) throws Throwable {
super(klass, Collections.<Runner> emptyList());
List<Object[]> parametersList = getParametersList(getTestClass());
if (parametersList.size() > 0) {
try {
runners.add(new TestClassRunnerForNonParameterized(
getTestClass()
.getJavaClass(), parametersList, 0));
} catch (Exception e) {
System.out.println("No non-parameterized tests.");
}
}
try {
for (int i = 0; i < parametersList.size(); i++) {
runners.add(new TestClassRunnerForParameters(getTestClass()
.getJavaClass(),
parametersList, i));
}
} catch (Exception e) {
System.out.println("No parameterized tests.");
}
}
@Override
protected List<Runner> getChildren() {
return runners;
}
@SuppressWarnings("unchecked")
private List<Object[]> getParametersList(TestClass klass)
throws Throwable {
return (List<Object[]>) getParametersMethod(klass).invokeExplosively(
null);
}
private FrameworkMethod getParametersMethod(TestClass testClass)
throws Exception {
List<FrameworkMethod> methods = testClass
.getAnnotatedMethods(Parameters.class);
for (FrameworkMethod each : methods) {
int modifiers = each.getMethod().getModifiers();
if (Modifier.isStatic(modifiers) && Modifier.isPublic(modifiers))
return each;
}
throw new Exception("No public static parameters method on class "
+ testClass.getName());
}
}
答案 6 :(得分：0)
假设您使用Parametrized.class来运行测试类 - 将所有非参数化测试标记为@Ignored。否则，您可以创建一个静态内部类来对所有参数化测试进行分组，另一个用于非参数化测试。
答案 7 :(得分：0)
我做了类似马修的解决方案。但是，我创建了两个扩展当前文件的新java文件，以便ComponentSingleTests不会运行两次。这样，他们可以从父类共享公共成员变量和辅助方法。我在Matthew的解决方案中遇到的问题是我的单个测试运行了两次而不是一次，因为Enclosed.class（扩展了Suite.class）将使您的测试运行两次，如此链接中所述 Prevent junit tests from running twice
ComponentTest.java
public class ComponentTest {
public int sharedMemberVariables;
...
}
ComponentParamTests.java
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
@RunWith(Parameterized.class)
public class ComponentParamTests extends ComponentTest {
@Parameters
...
@Test
public void testCaseUsingParams() throws Exception {
}
}
ComponentSingleTests.java
import org.junit.Test;
public class ComponentSingleTests {
@Test
public void testCaseWithoutParams() throws Exception {
...
}
}
答案 8 :(得分：0)
我在春季启动MockMvc中编写测试时陷入了这个问题 我只是在单独的Java文件中创建了两个类（一个用于 ParameterizedTest ，另一个用于 SingleTest ），并为它们创建了一个套件。因为内部类为静态成员而不是静态成员和类创建错误。
答案 9 :(得分：0)
对于那些希望参数来自 java函数而不是批注的人：
@ParameterizedTest
@MethodSource("provideStringsForIsBlank")
void isBlank_ShouldReturnTrueForNullOrBlankStrings(String input, boolean expected) {
assertEquals(expected, Strings.isBlank(input));
}
private static Stream<Arguments> provideStringsForIsBlank() {
return Stream.of(
Arguments.of(null, true),
Arguments.of("", true),
Arguments.of(" ", true),
Arguments.of("not blank", false)
);
}