assert

one line assert to test if STL container is sorted

由 帅比萌擦擦* 提交于 2019-12-20 18:26:28
问题 Is there a way to write a one line condition that would return true if STL container is sorted? The container in question is std::vector I intend to use it in an assert 回答1: Use adjacent_find in combination with less or greater functor. Restriction: You should know whether the container is sorted in ascending or descending. If the vector is supposed to be sorted in ascending order: //Checks the first element where adjacent value where elem > nextElem //returns end if the vector is sorted! /

Why assertEquals and assertSame in junit return the same result for two instances same class?

由 拟墨画扇 提交于 2019-12-20 11:36:22
问题 According to documentation assertEquals() Asserts that two objects are equal. assertSame() Asserts that two objects refer to the same object. So I am expecting that if I have a class like below class SomeClass {} then SomeClass someClass1= new SomeClass(); SomeClass someClass2= new SomeClass(); assertSame(someClass1,someClass2); // fail assertEquals(someClass1,someClass2); // fail the assertEquals should pass and assertSame should fail, as the value of both classes are equal but they have

Why assertEquals and assertSame in junit return the same result for two instances same class?

由 会有一股神秘感。 提交于 2019-12-20 11:36:08
问题 According to documentation assertEquals() Asserts that two objects are equal. assertSame() Asserts that two objects refer to the same object. So I am expecting that if I have a class like below class SomeClass {} then SomeClass someClass1= new SomeClass(); SomeClass someClass2= new SomeClass(); assertSame(someClass1,someClass2); // fail assertEquals(someClass1,someClass2); // fail the assertEquals should pass and assertSame should fail, as the value of both classes are equal but they have

Diff between Assert.AreEqual and Assert.AreSame?

由 亡梦爱人 提交于 2019-12-20 10:36:11
问题 What is the difference between Assert.AreEqual and Assert.AreSame ? 回答1: It means that AreSame() checks that they are the exact same object - if reference indicate the same object in memory. AreEqual() checks that objects has equal type and value. Equal objects can exist in two different places in memory. 回答2: Assert.AreEqual(a, b) is the same as Assert.IsTrue(Object.Equals(a, b)) Assert.AreSame(a, b) is the same as Assert.IsTrue(Object.ReferenceEquals(a, b)) (the only reason I knew is I just

How to assertThat something is null with Hamcrest?

由 跟風遠走 提交于 2019-12-20 09:07:29
问题 How would I assertThat something is null ? for example assertThat(attr.getValue(), is("")); But I get an error saying that I cannot have null in is(null) . 回答1: You can use IsNull.nullValue() method: import static org.hamcrest.Matchers.is; import static org.hamcrest.Matchers.nullValue; assertThat(attr.getValue(), is(nullValue())); 回答2: why not use assertNull(object) / assertNotNull(object) ? 回答3: If you want to hamcrest , you can do import static org.hamcrest.Matchers.nullValue; assertThat

Java/ JUnit - AssertTrue vs AssertFalse

由 让人想犯罪 __ 提交于 2019-12-20 08:24:16
问题 I'm pretty new to Java and am following the Eclipse Total Beginner's Tutorials. They are all very helpful, but in Lesson 12, he uses assertTrue for one test case and assertFalse for another. Here's the code: // Check the book out to p1 (Thomas) // Check to see that the book was successfully checked out to p1 (Thomas) assertTrue("Book did not check out correctly", ml.checkOut(b1, p1)); // If checkOut fails, display message assertEquals("Thomas", b1.getPerson().getName()); assertFalse("Book was

关于debug

由 。_饼干妹妹 提交于 2019-12-20 04:52:12
有人说web程序员不算是真正的程序员，刚听到这句话的时候很气愤，但仔细想想，这话还是很有道理的 。可以说，大部分的web程序员不能算是真正的程序员，因为他们的大部分注意力在实现功能上，而对一 些程序员必须要掌握的东西丝毫不在意。可以这么说，还不会爬就想跑了。 可能你不会同意上面的话，但问一下自己，除了改改例子实现功能以外，你对一些基本的东西有多少了解 ？先不说那些复杂的诸如面向对象一类的东西，我们就说说简单的排错、纠错吧，你做了多少？ 想想看，作为程序员恐怕每天大多数的时间是在debug，但究竟有多少人真正掌握合理的、科学的去debug 呢？以前的web编程语言象asp/php/cgi等关于debug的功能很弱，但现在的c#及java提供了丰富的debug手 段，但你用了多少呢？你可能对System.Data.SqlClient的每个类、每个方法、每个属性都了如指掌，但 你对System.Diagnostics了解多少呢？ 现代的编程语言如c++ , java , c#等都十分重视对错误的防止、处理，在这儿我就讲一下在c#里的排错 、纠错，希望大家能从中学到一些有用的东西，希望以后不会再听到文章开头那句话。 debug最理想的状态是什么？这个不用我说，那就是defect free，没有bug，呵呵。但早有人说了，没有 bug那还叫程序吗？win2000还60000多个bug呢

pytest文档11-assert断言

由 喜欢而已 提交于 2019-12-19 21:27:31
前言 断言是写自动化测试基本最重要的一步，一个用例没有断言，就失去了自动化测试的意义了。什么是断言呢？ 简单来讲就是实际结果和期望结果去对比，符合预期那就测试pass，不符合预期那就测试 failed assert pytest允许您使用标准Python断言来验证Python测试中的期望和值。例如，你可以写下 # content of test_assert1.py def f(): return 3 def test_function(): assert f() == 4 断言f()函数的返回值，接下来会看到断言失败，因为返回的值是3，判断等于4，所以失败了 $ pytest test_assert1.py =========================== test session starts ============================ platform linux -- Python 3.x.y, pytest-3.x.y, py-1.x.y, pluggy-0.x.y rootdir: $REGENDOC_TMPDIR, inifile: collected 1 item test_assert1.py F [100%] ================================= FAILURES ========================

Why is assert not enabled by default in java

由 旧时模样 提交于 2019-12-19 05:59:06
问题 My question is from the perspective of language design. Why is assert treated differently i.e. it raises a error and not an exception, it is not enabled by default etc.. It does seem elegant(very subjective opinion), easy to read(again subjective) for doing validations & also there are tools(IDE) which can live-evaluate it and provide warnings based on assertions. 回答1: I'd say that the reason is that defaults for Java are meant to build "release" version of software - if users need to build

java 中的断言assert的使用

由 爱⌒轻易说出口 提交于 2019-12-18 18:37:51
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 一、assertion的意义和用法 J2SE 1.4在语言上提供了一个新特性，就是assertion功能，它是该版本在Java语言方面最大的革新。 从理论上来说，通过 assertion方式可以证明程序的正确性，但是这是一项相当复杂的工作，目前还没有太多的实践意义。 在实现中，assertion就是在程序中的一条语句，它对一个boolean表达式进行检查，一个正确程序必须保证这个boolean表达式的值为true；如果该值为false，说明程序已经处于不正确的状态下，系统将给出警告或退出。 一般来说，assertion用于保证程序最基本、关键的正确性。assertion检查通常在开发和测试时开启。为了提高性能，在软件发布后，assertion检查通常是关闭的。 1、语法表示 在语法上，为了支持assertion，Java增加了一个关键字assert。它包括两种表达式，分别如下： assert expression1; assert expression1:expression2; 在两种表达式中，expression1表示一个boolean表达式， expression2表示一个基本类型或者是一个对象(Object)，基本类型包括boolean,char,double,float,int和 long
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