JUnit 5集合类型参数导致"@ParameterizedTest"错误. [英] JUnit 5 Collection type parameters cause errors with "@ParameterizedTest"
本文介绍了JUnit 5集合类型参数导致"@ParameterizedTest"错误.的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我无法从先前提出的问题中找到错误的原因，因为它们与"@Test"(不允许自定义数据类型)有关.
I cannot find the reason of the errors from previously asked questions, because they were about "@Test" (which does not allow custom data types).
我有一个程序，该程序接受String类型的输入(通常是一个文本块)，并以List的形式返回输入的句子.为了正确测试该程序，我尝试以列表的形式存储我的输入和期望的输出(将与我的程序的输出进行比较，这是测试的目的).这里，DataStructure类由2个属性组成:字符串类型属性和列表类型属性.
I have a program which takes a String type input (which is usually a block of text), and returns input's sentences in the form of List. To test this program properly I tried to store my inputs and expected outputs (which will be compared to the outputs of my program, purpose of the test) in the form of List. Here DataStructure class consists of 2 attributes: a String type attribute, and a List type attribute.
总共，我有一些有关程序本身的必要类，SentenceSplitterTest类，DataStructure类和Collection类.在Collection类中，我处理上述List的加载过程.我基本上会执行一些文件操作，并将输入和期望的输出存储在Collection类中.以下是我的ProgramTest.java文件的内容.
In total, I have some necessary classes about the program itself, SentenceSplitterTest class, DataStructure class, and Collection class. In Collection class I handle the loading process of the List mentioned above. I basically do some file operations and store my inputs and expected outputs inside Collection class. Below here is the content of my ProgramTest.java file.
package Classes;
import org.junit.Before;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import static org.junit.jupiter.api.Assertions.assertEquals;
@RunWith(Parameterized.class)
public class SentenceSplitterTest {
private String input;
private List<String> output = new ArrayList<>();
private SentenceSplitter sentencesplitter;
private static CollectionClass collectionClass;
static {
try {
collectionClass = new CollectionClass();
} catch (IOException e) {
e.printStackTrace();
}
}
public SentenceSplitterTest(String input, List<String> output) {
super();
this.input = input;
this.output = output;
}
@Before
public void initialize() throws IOException {
sentencesplitter = new SentenceSplitter();
}
@ParameterizedTest
@MethodSource("data")
public void testSentenceSplitterTest() {
System.out.println("Expected output: " + output);
assertEquals(output, sentencesplitter.sentenceSplit(input));
}
public static Collection data() {
return collectionClass.getContent();
}
}
如您所见，我使用@MethodSource("data")设置参数.我的测试屏幕看起来像此
As you can see, I used @MethodSource("data") to set my parameters. My test screen looks like this
我在屏幕快照中收到InitializationError的以下错误:
I get the following error for InitializationError in the screenshot:
java.lang.Exception:类上没有公共静态参数方法 Classs.SentenceSplitterTest
java.lang.Exception: No public static parameters method on class Classes.SentenceSplitterTest
对于屏幕快照中的每个元素，我都会收到以下错误消息:
I get the following error for each element in the screenshot:
org.junit.jupiter.api.extension.ParameterResolutionException:否 在参数注册为参数[java.lang.String arg0]的ParameterResolver 可执行文件[公共 Classes.SentenceSplitterTest(java.lang.String，java.util.List)]. 我找不到解决该问题的方法.请帮忙.
org.junit.jupiter.api.extension.ParameterResolutionException: No ParameterResolver registered for parameter [java.lang.String arg0] in executable [public Classes.SentenceSplitterTest(java.lang.String,java.util.List)]. I cannot find what I should do to solve the issues. Please help.
要求我共享CollectionClass类.
EDIT 1: I am asked to share CollectionClass class.
package Classes;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import static java.nio.file.Files.readAllLines;
public class CollectionClass {
private static List<DataStructure> collection = new ArrayList<>();
public List<DataStructure> getContent() {
return collection;
}
public CollectionClass() throws IOException {
List<String> inputs = readAllLines(Paths.get("inputs.txt"), StandardCharsets.UTF_8);
List<String> outputs = readAllLines(Paths.get("outputs.txt"), StandardCharsets.UTF_8);
int i = 0;
int j = 0;
int ctr = 0;
while(i< inputs.size() || j< outputs.size()) {
DataStructure structure = new DataStructure();
String inputIncoming = null;
List<String> outputIncoming = new ArrayList<String>();
if(i< inputs.size()) {
if(!inputs.get(i).equals("-")) {
// nothing
}
else {
i++;
inputIncoming = inputs.get(i);
structure.string = inputIncoming;
}
}
if(j< outputs.size()) {
if(!outputs.get(j).equals("-") && !outputs.get(j).equals("--")) {
// nothing
}
else {
if(outputs.get(j).equals("-")) {
j++;
outputIncoming.add(outputs.get(j));
structure.listOfString = outputIncoming;
}
else if(outputs.get(j).equals("--")) {
j++;
outputIncoming.add(outputs.get(j));
j++;
outputIncoming.add(outputs.get(j));
structure.listOfString = outputIncoming;
}
}
}
collection.add(ctr,structure);
i++;
j++;
ctr++;
}
for(DataStructure structure: collection) {
System.out.println(structure.string);
System.out.println(structure.listOfString);
}
}
}
我也想添加DataStructure类.
I want to add DataStructure class, too.
package Classes;
import java.util.ArrayList;
import java.util.List;
public class DataStructure {
public String string;
public List<String> listOfString = new ArrayList<>();
}
我被要求放入stacktrace.在这里.
EDIT 2: I am asked to put stacktrace. Here it is.
java.lang.NullPointerException
at Classes.SentenceSplitterTest.testSentenceSplitterTest(SentenceSplitterTest.java:46)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:389)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:115)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:167)
at org.junit.jupiter.engine.execution.ThrowableCollector.execute(ThrowableCollector.java:40)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:163)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:110)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:57)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:83)
at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$0(HierarchicalTestExecutor.java:85)
at org.junit.jupiter.engine.descriptor.TestTemplateTestDescriptor.execute(TestTemplateTestDescriptor.java:114)
at org.junit.jupiter.engine.descriptor.TestTemplateTestDescriptor.lambda$execute$2(TestTemplateTestDescriptor.java:86)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
at java.base/java.util.stream.ReferencePipeline$11$1.accept(ReferencePipeline.java:442)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1492)
at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:658)
at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:274)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:274)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1492)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:274)
at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1492)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
at org.junit.jupiter.engine.descriptor.TestTemplateTestDescriptor.execute(TestTemplateTestDescriptor.java:86)
at org.junit.jupiter.engine.descriptor.TestTemplateTestDescriptor.execute(TestTemplateTestDescriptor.java:36)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:83)
at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92)
at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$null$2(HierarchicalTestExecutor.java:92)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.lambda$execute$3(HierarchicalTestExecutor.java:92)
at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:77)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:51)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:43)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:170)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:154)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:90)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:74)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
推荐答案
您正在混合JUnit 4和JUnit Jupiter参数化测试.在JUnit JUpiter中，没有测试运行程序，构造函数保持无参数状态，并将参数传递给测试方法(这有点让人联想到JUnit 4的理论):
You're mixing JUnit 4 and JUnit Jupiter parameterized tests. In JUnit JUpiter, there's no test runner, the constructor remains parameterless and you pass the parameters to the test method (in a way that's a bit reminiscent of JUnit 4's Theories):
public class SentenceSplitterTest {
private SentenceSplitter sentencesplitter;
private static CollectionClass collectionClass;
// Initialization of CollectionClass moved here (instead of a static block) for two
// reasons:
// 1. If the initialization fails, you can't run the test anyway - better fail
// right here that print an error and continue to the test which we
// know won't work
// 2. It just looks neater
@BeforeAll
public static void initializeCollectionClass() throws IOException {
collectionClass = new CollectionClass();
}
@BeforeEach
public void initializeSentenceSplitter() throws IOException {
sentencesplitter = new SentenceSplitter();
}
@ParameterizedTest
@MethodSource("data")
public void testSentenceSplitterTest(DataStructure ds) {
String input = ds.string;
List<String> output = ds.listOfString;
assertEquals(output, sentencesplitter.sentenceSplit(input));
}
public static Stream<DataStructure> data() {
return collectionClass.getContent().stream();
}
}
这篇关于JUnit 5集合类型参数导致"@ParameterizedTest"错误.的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
