AssertJ Class Methods

內容目錄

提供了一組豐富的斷言和真正有用的錯誤訊息，驗證 Class 是否為空值、實例相等，提高了測試程式碼的可讀性，使用 AssertJ Class Java Methods 流式斷言驗證程式碼，本篇增加了範例，並透過單元測試來驗證產出結果。

檔案目錄

./
   +- src
       +- test
       |   +- org
       |       +- ruoxue
       |           +- spring_boot_168
       |               +- test
       |                   +- assertj
       |                       +- clazz
       |                           +- AssertJClassMethodsTest.java

單元測試

AssertJ Class Methods Java 斷言類別的主要目的是取得類別以進行斷言。

isNull

AssertJ Class Methods Java 驗證是否為空值，若不成立，則會拋出 AssertionError 。

	@Test
	public void isNull() {
		Class<?> clazz = null;
		System.out.println(clazz);
		assertThat(clazz).isNull();

		Class<?> clazz2 = null;
		System.out.println(clazz2);
		assertThat(clazz2).isNull();
	}

null
null

isNotNull

AssertJ Class Methods Java 驗證是否不為空值，若不成立，則會拋出 AssertionError 。

	@Test
	public void isNotNull() {
		Class<?> clazz = String.class;
		System.out.println(clazz);
		assertThat(clazz).isNotNull();

		Class<?> clazz2 = Integer.class;
		System.out.println(clazz2);
		assertThat(clazz2).isNotNull();
	}

class java.lang.String
class java.lang.Integer

isEqualTo

AssertJ Class Methods in Java 驗證類別是否相等，若不成立，則會拋出 AssertionError 。

	@Test
	public void isEqualTo() {
		Class<?> clazz = String.class;
		Class<?> clazz2 = String.class;
		System.out.println(clazz);
		System.out.println(clazz2);
		assertThat(clazz).isEqualTo(clazz2);

		Class<?> intClazz = Integer.class;
		Class<?> intClazz2 = Integer.class;
		System.out.println(intClazz);
		System.out.println(intClazz2);
		assertThat(intClazz).isEqualTo(intClazz2);
	}

class java.lang.String
class java.lang.String
class java.lang.Integer
class java.lang.Integer

isNotEqualTo

AssertJ Class Methods in Java 驗證類別是否不相等，若不成立，則會拋出 AssertionError 。

	@Test
	public void isNotEqualTo() {
		Class<?> clazz = String.class;
		Class<?> clazz2 = Character.class;
		System.out.println(clazz);
		System.out.println(clazz2);
		assertThat(clazz).isNotEqualTo(clazz2);

		Class<?> intClazz = Integer.class;
		Class<?> intClazz2 = Double.class;
		System.out.println(intClazz);
		System.out.println(intClazz2);
		assertThat(intClazz).isNotEqualTo(intClazz2);
	}

class java.lang.String
class java.lang.Character
class java.lang.Integer
class java.lang.Double

isSameAs

AssertJ Class Functions in Java 驗證類別是否相等，若不成立，則會拋出 AssertionError 。

	@Test
	public void isSameAs() {
		Class<?> clazz = String.class;
		Class<?> clazz2 = clazz;
		System.out.println(clazz);
		System.out.println(clazz2);
		assertThat(clazz).isSameAs(clazz2);

		Class<?> intClazz = Integer.class;
		Class<?> intClazz2 = intClazz;
		System.out.println(intClazz);
		System.out.println(intClazz2);
		assertThat(intClazz).isSameAs(intClazz2);
	}

class java.lang.String
class java.lang.String
class java.lang.Integer
class java.lang.Integer

isNotSameAs

AssertJ Class Functions in Java 驗證類別是否不相等，若不成立，則會拋出 AssertionError 。

	@Test
	public void isNotSameAs() {
		Class<?> clazz = String.class;
		Class<?> clazz2 = Character.class;
		System.out.println(clazz);
		System.out.println(clazz2);
		assertThat(clazz).isNotSameAs(clazz2);

		Class<?> intClazz = Integer.class;
		Class<?> intClazz2 = Double.class;
		System.out.println(intClazz);
		System.out.println(intClazz2);
		assertThat(intClazz).isNotSameAs(intClazz2);
	}

class java.lang.String
class java.lang.Character
class java.lang.Integer
class java.lang.Double

AssertJClassMethodsTest.java

AssertJ Class Methods in Java 新增單元測試，驗證是否符合預期。

package org.ruoxue.spring_boot_168.test.assertj.clazz;

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

import org.junit.jupiter.api.Test;

public class AssertJClassMethodsTest {

	@Test
	public void isNull() {
		Class<?> clazz = null;
		System.out.println(clazz);
		assertThat(clazz).isNull();

		Class<?> clazz2 = null;
		System.out.println(clazz2);
		assertThat(clazz2).isNull();
	}

	@Test
	public void isNotNull() {
		Class<?> clazz = String.class;
		System.out.println(clazz);
		assertThat(clazz).isNotNull();

		Class<?> clazz2 = Integer.class;
		System.out.println(clazz2);
		assertThat(clazz2).isNotNull();
	}

	@Test
	public void isEqualTo() {
		Class<?> clazz = String.class;
		Class<?> clazz2 = String.class;
		System.out.println(clazz);
		System.out.println(clazz2);
		assertThat(clazz).isEqualTo(clazz2);

		Class<?> intClazz = Integer.class;
		Class<?> intClazz2 = Integer.class;
		System.out.println(intClazz);
		System.out.println(intClazz2);
		assertThat(intClazz).isEqualTo(intClazz2);
	}

	@Test
	public void isNotEqualTo() {
		Class<?> clazz = String.class;
		Class<?> clazz2 = Character.class;
		System.out.println(clazz);
		System.out.println(clazz2);
		assertThat(clazz).isNotEqualTo(clazz2);

		Class<?> intClazz = Integer.class;
		Class<?> intClazz2 = Double.class;
		System.out.println(intClazz);
		System.out.println(intClazz2);
		assertThat(intClazz).isNotEqualTo(intClazz2);
	}

	@Test
	public void isSameAs() {
		Class<?> clazz = String.class;
		Class<?> clazz2 = clazz;
		System.out.println(clazz);
		System.out.println(clazz2);
		assertThat(clazz).isSameAs(clazz2);

		Class<?> intClazz = Integer.class;
		Class<?> intClazz2 = intClazz;
		System.out.println(intClazz);
		System.out.println(intClazz2);
		assertThat(intClazz).isSameAs(intClazz2);
	}

	@Test
	public void isNotSameAs() {
		Class<?> clazz = String.class;
		Class<?> clazz2 = Character.class;
		System.out.println(clazz);
		System.out.println(clazz2);
		assertThat(clazz).isNotSameAs(clazz2);

		Class<?> intClazz = Integer.class;
		Class<?> intClazz2 = Double.class;
		System.out.println(intClazz);
		System.out.println(intClazz2);
		assertThat(intClazz).isNotSameAs(intClazz2);
	}
}

心得分享

AssertJ Class Functions in Java 為用 Java 編寫的測試程式提供了流暢的斷言語句，這些斷言語句通常與 JUnit 測試一起使用， AssertJ 斷言的基本方法是 assertThat 方法，善用 AssertJ Class Methods in Java 將有助於驗證效率的提升。