JUnit3测试类中assertThat方法未定义问题求助

问题概述 #

学习入门Java课程时，单元测试作业因assertThat方法调用报错无法提交。自动评分要求必须使用assertThat，但调用时始终提示："The method assertThat(Point) is undefined for the type CleverBrainTest"，Eclipse对应行显示红色警告，运行测试也触发该错误。Eclipse建议使用assertTrue可正常运行，但自动评分系统仅接受assertThat。

补充背景 #

• 按课程要求将测试类设置为JUnit3测试
• 已导入指定的导入语句
• CleverBrain实现了Brain接口（一个用于自动玩俄罗斯方块的机器人接口），这是首次为接口编写测试
• 尝试编写setUp()方法失败，只能在每个测试方法中重复初始化代码
• 使用基于Ubuntu的Linux发行版

测试类CleverBrainTest代码 #

// -------------------------------------------------------------------------
import student.*;
import student.tetris.*;
import static org.assertj.core.api.Assertions.*;

/**
 *  Tests to measure performance of CleverBrain
 * 
 *  @author My Name
 *  @version Today's Date
 */
public class CleverBrainTest
    extends TestCase
{
    //~ Fields ................................................................
    
    
    //~ Constructors ..........................................................

    //~Public  Methods ........................................................    
    /**
     * Tests brain's ability to place sticks in deep holes
     */
    public void testStickInDeepHole()
    {
        Board deepHole = new Board(10, 24,
            "######### ",
            "######### ",
            "######### ",
            "######### "
            );
        Brain myBrain = new CleverBrain();
        Piece stick = Piece.getPiece(Piece.STICK, 0);
        Move best = myBrain.bestMove(deepHole, stick, 20);   

        // Now call the brain
        best = myBrain.bestMove(deepHole, stick, 20);

        // Expect the piece will go to the bottom right hole
        this.assertThat(best.getLocation()).isEqualTo(new Point(10, 0));
        // Expect the piece is rotated counter-clockwise 0 times
        this.assertThat(best.getPiece()).isEqualTo(Piece.SQUARE, 0); // make sure it's correct
    }
    
    
    /**
     * Tests Brain's ability to choose a reasonable target
     */
    public void testSetTarget()
    {
        Board squareHole = new Board(10, 24,
            "          ",
            "#####  ###",
            "#####  ###",
            "##########"
            );
        Brain myBrain = new CleverBrain();
        Piece square = Piece.getPiece(Piece.SQUARE, 0);
        Move best = myBrain.bestMove(squareHole, square, 20);

        // Now call the brain
        best = myBrain.bestMove(squareHole, square, 20);
        
        // Expect the lower left destination is where the hole is
        System.out.println(best.getLocation());
        this.assertThat(best.getLocation()).isEqualTo(new Point(5, 1));
    }
}

错误堆栈信息 #

java.lang.Error: Unresolved compilation problem: 
    The method assertThat(Point) is undefined for the type CleverBrainTest

    at CleverBrainTest.testSetTarget(CleverBrainTest.java:66)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    at junit.framework.TestCase.runTest(TestCase.java:176)
    at junit.framework.TestCase.runBare(TestCase.java:141)
    at junit.framework.TestResult$1.protect(TestResult.java:122)
    at junit.framework.TestResult.runProtected(TestResult.java:142)
    at junit.framework.TestResult.run(TestResult.java:125)
    at junit.framework.TestCase.run(TestCase.java:129)
    at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:128)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:40)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:529)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:756)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:452)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:210)

已尝试的解决方法 #

• 将assertj-core-3.19.0.jar添加到项目构建路径，但错误依旧
• 尝试切换到JUnit4，未成功，且课程要求使用JUnit3

内容的提问来源于stack exchange，提问作者Pellet Muncher