Eclipse Oxygen中Xtend编写JUnit 5测试用例遇导入错误求助

Hey there! Let's work through getting your Xtend-written JUnit 5 tests compiled and running smoothly in Eclipse Oxygen with Maven. I'll break this down into actionable steps so you can get up and running quickly.

First, make sure your pom.xml has all the right dependencies and plugins to handle Xtend compilation and JUnit 5 execution. Here's a tested snippet to use:

<dependencies>
    <!-- JUnit 5 Core Dependencies -->
    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-api</artifactId>
        <version>5.8.2</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-engine</artifactId>
        <version>5.8.2</version>
        <scope>test</scope>
    </dependency>

    <!-- Xtend Dependencies (match Eclipse Oxygen's compatible version) -->
    <dependency>
        <groupId>org.eclipse.xtend</groupId>
        <artifactId>org.eclipse.xtend.core</artifactId>
        <version>2.18.0</version>
        <scope>compile</scope>
    </dependency>
    <dependency>
        <groupId>org.eclipse.xtend</groupId>
        <artifactId>org.eclipse.xtend.lib</artifactId>
        <version>2.18.0</version>
        <scope>compile</scope>
    </dependency>
</dependencies>

<build>
    <plugins>
        <!-- Xtend Maven Plugin to compile .xtend files -->
        <plugin>
            <groupId>org.eclipse.xtend</groupId>
            <artifactId>xtend-maven-plugin</artifactId>
            <version>2.18.0</version>
            <executions>
                <execution>
                    <goals>
                        <goal>compile</goal>
                        <goal>testCompile</goal>
                    </goals>
                </execution>
            </executions>
            <dependencies>
                <dependency>
                    <groupId>org.eclipse.xtext</groupId>
                    <artifactId>org.eclipse.xtext.xbase.lib</artifactId>
                    <version>2.18.0</version>
                </dependency>
            </dependencies>
        </plugin>

        <!-- Surefire Plugin for running JUnit 5 tests -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>3.0.0-M7</version>
        </plugin>
    </plugins>
</build>

Note: Eclipse Oxygen works best with Xtend versions 2.14.x to 2.18.x. Avoid newer versions (like 2.20+) to prevent compatibility issues.

• Install Xtend Plugin: Go to Help > Eclipse Marketplace, search for "Xtend", and install the plugin matching your Oxygen release.
• Add JUnit 5 Support: Similarly, search the Marketplace for "JUnit 5 Tools for Eclipse Oxygen" and install it to ensure Eclipse recognizes JUnit 5 annotations.
• Verify Build Path: Right-click your project > Build Path > Configure Build Path. Under the Libraries tab, confirm JUnit 5 (Jupiter API/Engine) and Xtend libraries are listed.
• Enable Xtend Builder: Right-click project > Properties > Xtend, then check "Enable Xtend Builder". Ensure the output directories match your Maven setup (target/classes for main code, target/test-classes for tests).

Here's a simple example to follow—make sure you're using JUnit 5's annotations, not JUnit 4's:

package com.yourpackage.tests

import org.junit.jupiter.api.Test
import static org.junit.jupiter.api.Assertions.*

class SampleXtendTest {

    @Test
    def void testStringEquality() {
        val expected = "Xtend + JUnit 5 works!"
        val actual = "Xtend + JUnit 5 works!"
        assertEquals(expected, actual, "Strings should match exactly")
    }

    @Test
    def testMathCalculation() {
        assertEquals(10, 3 + 7, "Basic arithmetic checks out")
    }
}

Key points:

• Use org.junit.jupiter.api.Test (not the old JUnit 4 org.junit.Test).
• Define test methods with Xtend's def keyword.
• Static import Assertions for cleaner assertion calls.

Option 1: Use Maven Command Line #

Open a terminal in your project root and run:

mvn clean test

This will compile all Xtend code, then execute your JUnit 5 tests. You'll see the test results directly in the terminal.

Option 2: Run from Eclipse #

• Right-click your Xtend test class > Run As > JUnit Test. If configured correctly, Eclipse will launch the JUnit 5 runner and show results in the JUnit view.
• If Eclipse doesn't detect the tests, manually set the runner: Right-click the class > Run As > Run Configurations, select the JUnit tab, set Test runner to JUnit 5, then click Run.

• Xtend classes not found during compilation: Double-check the xtend-maven-plugin configuration in your pom.xml, and ensure the Xtend Builder is enabled in Eclipse. Run mvn compile to isolate build errors.
• Tests not executing: Confirm you're using JUnit 5's @Test annotation (not JUnit 4's). Also, verify the Maven Surefire plugin version supports JUnit 5.
• Version conflicts: If you see dependency errors, use mvn dependency:tree to spot conflicting versions, and align Xtend/JUnit 5 versions to match Eclipse Oxygen's compatibility.

内容的提问来源于stack exchange，提问作者Jonathan