当您使用Eclipse TestRunner运行JUnit 4 ParameterizedTest时，图形表示相当愚蠢：对于每个测试，您有一个名为[0]，[1]等的节点。
是否可以提供测试[0]，[1]等明确的名称？为测试实现toString方法似乎没有帮助。
（这是JUnit test with dynamic number of tests的后续问题。）
答案 0 :(得分：5)
我认为jUnit 4中没有内置的来实现这一点。
我已经实施了一个解决方案。我已根据现有的Parameterized类构建了自己的public class MyParameterized extends TestClassRunner {
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public static @interface Parameters {
}
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public static @interface Name {
}
public static Collection<Object[]> eachOne(Object... params) {
List<Object[]> results = new ArrayList<Object[]>();
for (Object param : params)
results.add(new Object[] { param });
return results;
}
// TODO: single-class this extension
private static class TestClassRunnerForParameters extends TestClassMethodsRunner {
private final Object[] fParameters;
private final Class<?> fTestClass;
private Object instance;
private final int fParameterSetNumber;
private final Constructor<?> fConstructor;
private TestClassRunnerForParameters(Class<?> klass, Object[] parameters, int i) throws Exception {
super(klass);
fTestClass = klass;
fParameters = parameters;
fParameterSetNumber = i;
fConstructor = getOnlyConstructor();
instance = fConstructor.newInstance(fParameters);
}
@Override
protected Object createTest() throws Exception {
return instance;
}
@Override
protected String getName() {
String name = null;
try {
Method m = getNameMethod();
if (m != null)
name = (String) m.invoke(instance);
} catch (Exception e) {
}
return String.format("[%s]", (name == null ? fParameterSetNumber : name));
}
@Override
protected String testName(final Method method) {
String name = null;
try {
Method m = getNameMethod();
if (m != null)
name = (String) m.invoke(instance);
} catch (Exception e) {
}
return String.format("%s[%s]", method.getName(), (name == null ? fParameterSetNumber : name));
}
private Constructor<?> getOnlyConstructor() {
Constructor<?>[] constructors = getTestClass().getConstructors();
assertEquals(1, constructors.length);
return constructors[0];
}
private Method getNameMethod() throws Exception {
for (Method each : fTestClass.getMethods()) {
if (Modifier.isPublic((each.getModifiers()))) {
Annotation[] annotations = each.getAnnotations();
for (Annotation annotation : annotations) {
if (annotation.annotationType() == Name.class) {
if (each.getReturnType().equals(String.class))
return each;
else
throw new Exception("Name annotated method doesn't return an object of type String.");
}
}
}
}
return null;
}
}
// TODO: I think this now eagerly reads parameters, which was never the
// point.
public static class RunAllParameterMethods extends CompositeRunner {
private final Class<?> fKlass;
public RunAllParameterMethods(Class<?> klass) throws Exception {
super(klass.getName());
fKlass = klass;
int i = 0;
for (final Object each : getParametersList()) {
if (each instanceof Object[])
super.add(new TestClassRunnerForParameters(klass, (Object[]) each, i++));
else
throw new Exception(String.format("%s.%s() must return a Collection of arrays.", fKlass.getName(), getParametersMethod().getName()));
}
}
private Collection<?> getParametersList() throws IllegalAccessException, InvocationTargetException, Exception {
return (Collection<?>) getParametersMethod().invoke(null);
}
private Method getParametersMethod() throws Exception {
for (Method each : fKlass.getMethods()) {
if (Modifier.isStatic(each.getModifiers())) {
Annotation[] annotations = each.getAnnotations();
for (Annotation annotation : annotations) {
if (annotation.annotationType() == Parameters.class)
return each;
}
}
}
throw new Exception("No public static parameters method on class " + getName());
}
}
public MyParameterized(final Class<?> klass) throws Exception {
super(klass, new RunAllParameterMethods(klass));
}
@Override
protected void validate(MethodValidator methodValidator) {
methodValidator.validateStaticMethods();
methodValidator.validateInstanceMethods();
}
}
类：
@RunWith(MyParameterized.class)
public class ParameterizedTest {
private File file;
public ParameterizedTest(File file) {
this.file = file;
}
@Test
public void test1() throws Exception {}
@Test
public void test2() throws Exception {}
@Name
public String getName() {
return "coolFile:" + file.getName();
}
@Parameters
public static Collection<Object[]> data() {
// load the files as you want
Object[] fileArg1 = new Object[] { new File("path1") };
Object[] fileArg2 = new Object[] { new File("path2") };
Collection<Object[]> data = new ArrayList<Object[]>();
data.add(fileArg1);
data.add(fileArg2);
return data;
}
}
用作：
{{1}}
这意味着我先前实例化了测试类。我希望这不会导致任何错误...我想我应该测试测试:)
答案 1 :(得分：3)
JUnit4现在allows specifying a name attribute到参数化注释，这样您就可以从参数的索引和toString方法指定命名模式。 E.g：
@Parameters(name = "{index}: fib({0})={1}")
public static Iterable<Object[]> data() {
return Arrays.asList(new Object[][] { { 0, 0 }, { 1, 1 }, { 2, 1 },
{ 3, 2 }, { 4, 3 }, { 5, 5 }, { 6, 8 } });
}
答案 2 :(得分：2)
无代码虽然不是那么舒服的解决方案是传递足够的上下文信息来识别断言消息中的测试。你仍会看到testXY [0]失败，但详细信息会告诉你哪一个是。
assertEquals("Not the expected decision for the senator " + this.currentSenatorName + " and the law " + this.votedLaw,
expectedVote, actualVote);
答案 3 :(得分：1)
如果您使用JUnitParams library（因为我有described here），参数化测试会将其字符串化参数作为自己的默认测试名称。
此外，you can see in their samples，JUnitParams还允许您使用@TestCaseName拥有自定义测试名称：
@Test @Parameters({ "1,1", "2,2", "3,6" }) @TestCaseName("factorial({0}) = {1}") public void custom_names_for_test_case(int argument, int result) { }@Test @Parameters({ "value1, value2", "value3, value4" }) @TestCaseName("[{index}] {method}: {params}") public void predefined_macro_for_test_case_name(String param1, String param2) { }
答案 4 :(得分：0)
没有暗示此功能已经或将要实施。我会要求这个功能，因为它很高兴。