[英]parameterized test constructor of junit java error message: Test class should have exactly one public zero-argument constructor
I can really use some help with this parameterized test case I am trying to create.对于我正在尝试创建的这个参数化测试用例,我真的可以使用一些帮助。 No matter what kind of constructor I create the IDE gives an error message.
无论我创建哪种构造函数,IDE 都会给出错误消息。 Here is my code:
这是我的代码:
@RunWith(Parameterized.class)
public class SolverTest {
final static File folder = new File("C:\\Users\\Azizam\\IdeaProjects\\EightPuzzle\\src\\ModifiedTests");
final static String destFolder = "C:\\Users\\Azizam\\IdeaProjects\\EightPuzzle\\src\\testresults";
final static ArrayList<Object[][]> filesList = new ArrayList<>();
final Object currentBoard = new Object();
@Parameterized.Parameters
public static Iterable<Object[][]> data() {
String path = "";
int counter = 0;
for (final File fileEntry : folder.listFiles()) {
//System.out.println("processing file: " + fileEntry.getName())
counter++;
if (counter == 20) break;
path = destFolder + fileEntry;
In in = new In(fileEntry.getAbsolutePath());
int n = in.readInt();
int moves = in.readInt();
int[][] tiles = new int[n][n];
for (int i = 0; i < n; i++)
for (int j = 0; j < n; j++)
tiles[i][j] = in.readInt();
Board b = new Board(tiles);
Object[][] fileList = new Object[][]{{b, moves}};
filesList.add(fileList);
}
return filesList;
}
@Parameterized.Parameter(0)
private Board board;
@Parameterized.Parameter(1)
private int expectedNumberOfMoves;
public SolverTest(Board board, int expectedNumberOfMoves) {
this.board = board;
this.expectedNumberOfMoves = expectedNumberOfMoves;
}
@Test
public void test() {
assertEquals(expectedNumberOfMoves, new Solver(board).moves());
}
}
I have tried different ways of creating a 1 parameter, 2, and no parameter constructors.我尝试了不同的方法来创建 1 参数、2 和无参数构造函数。 But I have never seen this type of issue or what the solution might be.
但我从未见过这类问题或解决方案可能是什么。 I am following this link and this tutorial.
我正在关注此链接和本教程。 This is my first parameterized test, and debug does not seem to provide much for me either.
这是我的第一个参数化测试,调试似乎也没有为我提供太多帮助。 I also saw these links, but they did not help.
我也看到了这些链接,但它们没有帮助。 I can provide the code for the rest of the project also on GitHub or gist.
我也可以在 GitHub 或 gist 上提供项目的 rest 的代码。 I did debug my code through creating the fileList properly, but I know little about what happens to it afterwards or what needs to happen.
我确实通过正确创建 fileList 来调试我的代码,但我对之后会发生什么或需要发生什么知之甚少。 Here is an excerpt of the error:
这是错误的摘录:
java.lang.Exception: Test class should have exactly one public zero-argument constructor
at org.junit.runners.BlockJUnit4ClassRunner.validateZeroArgConstructor(BlockJUnit4ClassRunner.java:171)
at org.junit.runners.parameterized.BlockJUnit4ClassRunnerWithParameters.validateConstructor(BlockJUnit4ClassRunnerWithParameters.java:90)
at org.junit.runners.BlockJUnit4ClassRunner.collectInitializationErrors(BlockJUnit4ClassRunner.java:127)
at org.junit.runners.ParentRunner.validate(ParentRunner.java:416)
at org.junit.runners.ParentRunner.<init>(ParentRunner.java:84)
at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:65)
at org.junit.runners.parameterized.BlockJUnit4ClassRunnerWithParameters.<init>(BlockJUnit4ClassRunnerWithParameters.java:27)
at org.junit.runners.parameterized.BlockJUnit4ClassRunnerWithParametersFactory.createRunnerForTestWithParameters(BlockJUnit4ClassRunnerWithParametersFactory.java:16)
at org.junit.runners.Parameterized.createRunnersForParameters(Parameterized.java:313)
at org.junit.runners.Parameterized.<init>(Parameterized.java:248)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:104)
at org.junit.vintage.engine.discovery.DefensiveAllDefaultPossibilitiesBuilder$DefensiveAnnotatedBuilder.buildRunner(DefensiveAllDefaultPossibilitiesBuilder.java:113)
Here is the latest version of my code:这是我的代码的最新版本:
package assignments;
import edu.princeton.cs.algs4.In;
import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import java.io.File;
import java.util.ArrayList;
import static junit.framework.TestCase.assertEquals;
@RunWith(Parameterized.class)
public class SolverTest {
final static File folder = new File("C:\\Users\\Azizam\\IdeaProjects\\EightPuzzle\\src\\ModifiedTests");
final static String destFolder = "C:\\Users\\Azizam\\IdeaProjects\\EightPuzzle\\src\\testresults";
final static ArrayList<Object[][]> filesList = new ArrayList<>();
final Object currentBoard = new Object();
@Parameterized.Parameters
public static Iterable<Object[][]> data() {
String path = "";
int counter = 0;
for (final File fileEntry : folder.listFiles()) {
//System.out.println("processing file: " + fileEntry.getName())
counter++;
if (counter == 20) break;
path = destFolder + fileEntry;
In in = new In(fileEntry.getAbsolutePath());
int n = in.readInt();
int moves = in.readInt();
int[][] tiles = new int[n][n];
for (int i = 0; i < n; i++)
for (int j = 0; j < n; j++)
tiles[i][j] = in.readInt();
Board b = new Board(tiles);
Object[][] fileList = new Object[][]{{b, moves}};
filesList.add(fileList);
}
return filesList;
}
@Parameterized.Parameter(0)
public Board board;
@Parameterized.Parameter(1)
public int expectedNumberOfMoves;
public SolverTest() {
}
@Test
public void test() {
assertEquals(expectedNumberOfMoves, new Solver(board).moves());
}
}
Here is a pic of the debug session showing everything I want in the file list.这是调试 session 的图片,显示了文件列表中我想要的所有内容。 Some how the board object does not transfer to my Solver constructor.
有些板子 object 不会转移到我的 Solver 构造函数。
Here is what the no-arg constructor error means.
这是无参数构造函数错误的含义。
The constructor in the test class is the following:测试 class 中的构造函数如下:
public SolverTest(Board board, int expectedNumberOfMoves) {
this.board = board;
this.expectedNumberOfMoves = expectedNumberOfMoves;
}
That takes 2 arguments, so is not a no-arg constructor.这需要 2 个 arguments,因此不是无参数构造函数。 The following is a no-arg constructor:
以下是无参数构造函数:
public SolverTest() {
}
Removing the 2-arg constructor will work, so this does not need to be explicitly listed, because the java compiler will add the default no-arg constructor automatically.删除 2-arg 构造函数将起作用,因此不需要显式列出,因为 java 编译器会自动添加默认的无参数构造函数。
HOWEVER the reason for the error is a mix of 2 approaches for the Parameterized
test class.然而,错误的原因是
Parameterized
测试 class 的两种方法的混合。
EITHER use a no-arg constructor with the @Parameterized.Parameters
fields (which need to be public and not private, by the way), OR remove those fields and use the construct with arguments that take the parameters.要么使用带有
@Parameterized.Parameters
字段的无参数构造函数(顺便说一下,这些字段需要是公共的而不是私有的),或者删除这些字段并使用带有参数的 arguments 的构造。
Here is the code modified to use the first approach (that is, with the @Parameterized.Parameters
fields):这是修改为使用第一种方法的代码(即,使用
@Parameterized.Parameters
字段):
@RunWith(Parameterized.class)
public class SolverTest {
final static File folder = new File("C:\\Users\\Azizam\\IdeaProjects\\EightPuzzle\\src\\ModifiedTests");
final static String destFolder = "C:\\Users\\Azizam\\IdeaProjects\\EightPuzzle\\src\\testresults";
final static ArrayList<Object[][]> filesList = new ArrayList<>();
final Object currentBoard = new Object();
@Parameterized.Parameters
public static Iterable<Object[][]> data() {
String path = "";
int counter = 0;
for (final File fileEntry : folder.listFiles()) {
//System.out.println("processing file: " + fileEntry.getName())
counter++;
if (counter == 20) break;
path = destFolder + fileEntry;
In in = new In(fileEntry.getAbsolutePath());
int n = in.readInt();
int moves = in.readInt();
int[][] tiles = new int[n][n];
for (int i = 0; i < n; i++)
for (int j = 0; j < n; j++)
tiles[i][j] = in.readInt();
Board b = new Board(tiles);
Object[][] fileList = new Object[][]{{b, moves}};
filesList.add(fileList);
}
return filesList;
}
@Parameterized.Parameter(0)
public Board board;
@Parameterized.Parameter(1)
public int expectedNumberOfMoves;
public SolverTest() {
}
@Test
public void test() {
assertEquals(expectedNumberOfMoves, new Solver(board).moves());
}
}
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