测试toString Java代码的错误

时间：2016-10-28 14:30:26

标签： java testing tostring

我正在尝试为“Book”类编写一些测试代码，该类从其他类获取和设置书籍信息：ISBN（字符串），标题（字符串），作者（字符串），publishDate（SimpleDateFormat“MMM.dd. yyy“），Price（Double）和Summary content（Blob）。当我尝试对全部或部分代码运行toString测试时（我已经更改了应该无数次设置的格式和字符串）：

@Test
public void testToString() {
    Book testBook6 = new Book();
    Title testTitle6 = new Title("Title: Moby Dick, ");
    Author testAuthor6 = new Author("Author: Mark Twain, ");
    ISBN testISBN6 = new ISBN("ISBN: 000-00-000-0000-0");
    testBook6.setTitle(testTitle6);
    testBook6.setAuthor(testAuthor6);
    testBook6.setISBN(testISBN6);
    assertEquals("Title: Moby Dick, Author: Mark Twain, ISBN: 000-00-000-0000-0", testBook6.toString());        
}

我收到错误：

org.junit.ComparisonFailure: expected:<[Title: Moby Dick, Author: Mark Twain, ISBN: 000-00-000-0000-0]> but was:<[book.application.Book@48533e64]>
    at org.junit.Assert.assertEquals(Assert.java:115)
    at org.junit.Assert.assertEquals(Assert.java:144)
    at book.application.BookTest.testToString(BookTest.java:61)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

当我尝试在我的剪贴簿中运行代码时：

Book testBook = new Book();
ISBN testISBN = new ISBN("ISBN: 000-00-000-0000-0");
Title testTitle = new Title("Title: Moby Dick, ");
Author testAuthor = new Author("Author: Mark Twain, ");
Date dNow = new Date( );
SimpleDateFormat ft = new SimpleDateFormat ("MMMM.dd.yyyy");
Price testPrice = new Price(2.25);
Blob testBlob = new Blob("Blah, Blah, Blah");

testBook.setISBN(testISBN);
testBook.setTitle(testTitle);
testBook.setAuthor(testAuthor);
testBook.setPrice(testPrice);
testBook.setBlob(testBlob);

System.out.println(testBook.toString());

要查看发生了什么，我只能返回“book.application.Book@1794d431”，每次运行时都会随机更改数字（例如1794d431）。所有测试都通过“Book”获取和设置的每个类，并且没有标记错误。这只是我的第二个Java项目，所以我对此很陌生;但是，我似乎已经撞墙了，当然可以使用一些帮助！

提前致谢！

package book.application;

import java.time.LocalDate;

public class Book {

    //fields
    private ISBN ISBN;
    private Title Title;
    private Author Author;
    private LocalDate publishDate;
    private Price Price;
    private Blob Blob;




    //getters and setters
    public LocalDate getPublishDate() {
        return publishDate;
    }
    public void setPublishDate(LocalDate publishDate) {
        this.publishDate = publishDate;
    }
    public ISBN getISBN() {
        return ISBN;
    }
    public void setISBN(ISBN ISBN) {
        this.ISBN = ISBN;
    }
    public Title getTitle() {
        return Title;
    }
    public void setTitle(Title Title) {
        this.Title = Title;
    }
    public Author getAuthor() {
        return Author;
    }
    public void setAuthor(Author Author) {
        this.Author = Author;
    }
    public Price getPrice() {
        return Price;
    }
    public void setPrice(Price Price) {
        this.Price = Price;
    }
    public Blob getBlob() {
        return Blob;
    }
    public void setBlob(Blob Blob) {
        this.Blob = Blob;
    }   

    @Override
    public String toString() {
        return "Title: " + this.getTitle().getTitle() + ", Author: " + this.getAuthor().getAuthor() + ", ISBN: " + this.getISBN().getISBN() + ", Published on: " + LocalDate.now() + ", costing: $" + this.getPrice().getPrice();
    }

}

3 个答案:

答案 0 :(得分：1)

错误表示您忘记覆盖正在测试的类的toString方法。

转到Book班级，添加toString的实施方式：

public class Book {
    ... // things you already have
    // Add an implementation:
    @Override
    public String toString() {
        // Add code constructing the output to satisfy your unit test
    }
}

答案 1 :(得分：1)

您需要覆盖Book类的toString方法。目前它使用默认的toString（）函数，该函数返回对象类型和哈希码。

以下是您的方法的样子：

@Override
public String toString() { 
    return "Title: '" + this.title + "', Author: '" + this.author + "', ISBN: '" + this.isbn + "'";
}

如果您不清楚这意味着什么，check out the API for the Object class。在Java中，所有类都扩展了Object，因此您可以从此类访问和覆盖（替换）许多方法。 ToString就是这样一种方法，并且此方法的默认行为不是您所期望的，因此在Java中创建新类时，覆盖toString()是很常见的。您可能想要查看的另一种方法是equals()。

答案 2 :(得分：0)

您的toString（）方法似乎未实现，并且具有默认的if($user->type == "SUPPORT"){ include('path/to/support/template.php'); } elseif($user->type == "CUSTOMER"){ include('path/to/customer/template.php'); } else { //Default catch bad types? } 版本。如果您发布了CREATE TABLE `USERS` ( `ID` int(10) NOT NULL PK AUTOINCREMENT, `TYPEID` int(10) NOT NULL, `NAME` varchar(99) NOT NULL, `EMAIL` varchar(99) NOT NULL, `PASSWORD` text NOT NULL, ) ALTER TABLE `USERS` ADD CONSTRAINT `USERS_ibfk_1` FOREIGN KEY (`TYPEID`) REFERENCES `TYPES` (`ID`) 代码，我们可以为您提供进一步的帮助。

此外，为了比较字符串，通常最好做Object

相关问题
最新问题