[TOC]

AssertJ 断言

<dependency>
  <groupId>org.assertj</groupId>
  <artifactId>assertj-core</artifactId>
  <!-- use 2.9.1 for Java 7 projects -->
  <version>3.15.0</version>
  <scope>test</scope>
</dependency>

import static org.assertj.core.api.Assertions.*;

// 假设条件，满足则继续执行
assumeThat(frodo.getRace()).isNotEqualTo(ORC);
// 设置错误消息必须在调用断言之前完成
assertThat(frodo.getAge())
        .as("check %s's age", frodo.getName())
        .isNotNull().isNotZero().isGreaterThanOrEqualTo(80).isLessThan(200)
        .isPositive().isNotNegative()
        .isIn(Arrays.asList(100, 200));
// Output:
// [check Frodo's age] expected:<100> but was:<33>

时间

assertThat(dateTime)
        .isBefore("2004-12-13T21:39:45.618-08:00")
        .isAfterYear(2013)
        .isBetween("2018-01-01", "2018-08-31")
        .isInSameHourAs(new Date())
        .isToday();

文件和文件内容

assertThat(xFile).exists().isFile().isRelative();
assertThat(contentOf(xFile)).startsWith("The Truth").contains("Is Out").endsWith("There");

字段

assertThat(sherlock)
        .usingRecursiveComparison() // 只比较字段
        .withStrictTypeChecking() // 同时比较类型(可以是子类形)
        .ignoringFields("name", "home.address.street")
        .ignoringFieldsMatchingRegexes(".*me")
        .ignoringActualNullFields()
        .ignoringFieldsOfTypes(double.class, Address.class)
        .isEqualToIgnoringCase(sherlockClone);

软断言

try (AutoCloseableSoftAssertions softly = new AutoCloseableSoftAssertions()) {
    softly.assertThat("George Martin").as("great authors").isEqualTo("JRR Tolkien");  
    softly.assertThat(42).as("response to Everything").isGreaterThan(100); 
}

AssertJ-DB 断言数据库

<dependency>
  <groupId>org.assertj</groupId>
  <artifactId>assertj-db</artifactId>
  <version>1.3.0</version>
  <scope>test</scope>
</dependency>

import static org.assertj.db.api.Assertions.assertThat;

Source source = new Source("jdbc:h2:mem:test", "sa", "");
Table table = new Table(source, "members");
Request request = new Request(dataSource, 
        "select name, firstname from members " +
        "where name like ? and firstname like ?;",
        "%e%", "%Paul%");
// Check column "name" values
assertThat(tableOrRequest).column("name")
        .value().isEqualTo("Clayton")
        .value().isEqualTo("Mullen");
// Check row at index 1 (the second row) values
assertThat(tableOrRequest).row(1)
        .value().isEqualTo(2)
        .value().isEqualTo("Evans")
        .value().isEqualTo(DateValue.of(1961, 8, 8))
        .value().isEqualTo(1.77);

附：谷歌 Truth 用法

<dependency>
  <groupId>com.google.truth</groupId>
  <artifactId>truth</artifactId>
  <version>1.0.1</version>
  <scope>test</scope>
</dependency>

<dependency>
  <groupId>com.google.truth.extensions</groupId>
  <artifactId>truth-java8-extension</artifactId>
  <version>1.0.1</version>
  <scope>test</scope>
</dependency>

import static com.google.common.truth.Truth.assertThat;
import static com.google.common.truth.Truth.assertWithMessage;
import static com.google.common.truth.Truth8.assertThat;

assertThat(string).startsWith("awe");
assertWithMessage("Without me, it's just aweso").that(string).contains("me");