Java 如何使用assertTrue？
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How to use assertTrue?
提问by darlik
I have:
我有：
package com.darlik.test;
import org.junit.Assert;
public class Test {
public static void main(String[] args) {
assertTrue(1, 2);
}
}
package with org.junit is set and working but in line with assertTrue i have error:
带有 org.junit 的包已设置并正常工作，但与 assertTrue 一致，我有错误：
The method assertTrue(int, int) is undefined for the type Test
未定义类型 Test 的方法 assertTrue(int, int)
Why? I use Eclipse.
为什么？我使用 Eclipse。
采纳答案by Reimeus
assertTrueis based on a single boolean condition. For example
assertTrue基于单个布尔条件。例如
assertTrue(1 == 2);
You need to import the statement statically to use
您需要静态导入语句才能使用
import static org.junit.Assert.assertTrue;
Typically, however assertEqualsis used when comparing 2 parameters, e.g.
然而，通常assertEquals在比较 2 个参数时使用，例如
public class MyTest {
@Test
public void testAssert() throws Exception {
assertEquals(1, 2);
}
}
回答by m4rtin
From the doc : assertTrue(boolean)or assertTrue(String, boolean)if you want to add a message.
从文档：assertTrue(boolean)或assertTrue(String, boolean)如果你想添加一条消息。
AssertTrue assert that a conditionis true, you still have to code such condition for it to be evaluatedat runtime.
AssertTrue 断言某个条件为真，您仍然必须编写此类条件以便在运行时对其进行评估。
回答by Jeroen Vannevel
You have to specify the class that defines that method:
您必须指定定义该方法的类：
Assert.assertTrue(condition);
Furthermore you're calling the method with 2 parameters which makes no sense. assertTrueexpects a single boolean expression.
此外，您正在使用 2 个参数调用该方法，这是没有意义的。assertTrue需要一个布尔表达式。
Although you can also do this by using a static import:
虽然您也可以通过使用静态导入来做到这一点：
import static org.junit.Assert.*;
which will allow you to call it as assertTrue(condition);instead.
这将允许您改为调用它assertTrue(condition);。
回答by Prakash
Better try assertThat with matchers. Check this blog about it https://objectpartners.com/2013/09/18/the-benefits-of-using-assertthat-over-other-assert-methods-in-unit-tests/
最好用匹配器尝试 assertThat 。检查这个博客https://objectpartners.com/2013/09/18/the-benefits-of-using-assertthat-over-other-assert-methods-in-unit-tests/
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
....
@Test
public void testNum() {
assertThat(repo.getNum(), is(equalTo(111)));
}
