Unit Test AssertJ Class with Examples

Table of Contents

介紹 isAssignableFrom 、 isProtected 、 isPublic 、 isStatic 等方法，許多測試驗證場景，提供開發者更流暢的驗證 API，驗證更直覺，使用流式斷言，不須再物件自己呼叫方法， AssertJ Class Unit Test with Examples 流暢地寫完驗證，不須再寫迴圈，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
       |                           +- UnitTestAssertJClassWithExamplesTest.java

單元測試

Examples AssertJ Class Unit Test 斷言類別的主要目的是取得類別以進行斷言。

SuperFruit

建立 SuperFruit 類別，覆寫 toString ，定義屬性和方法，用來建立一個物件。

	@NoArgsConstructor
	@Getter
	@Setter
	static class SuperFruit {
		private String id;

		public String toString() {
			ToStringBuilder builder = new ToStringBuilder(this, ToStringStyle.JSON_STYLE);
			builder.appendSuper(super.toString());
			builder.append("id", id);
			return builder.toString();
		}
	}

Fruit

建立 Fruit 類別，覆寫 toString ，定義屬性和方法，用來建立一個物件。

	@NoArgsConstructor
	@Getter
	@Setter
	protected class Fruit extends SuperFruit {
		private String name;
		private double quantity;
		private int type;

		public Fruit(String name, double quantity, int type) {
			this.name = name;
			this.quantity = quantity;
			this.type = type;
		}

		public String toString() {
			ToStringBuilder builder = new ToStringBuilder(this, ToStringStyle.JSON_STYLE);
			builder.appendSuper(super.toString());
			builder.append("name", name);
			builder.append("quantity", quantity);
			builder.append("type", type);
			return builder.toString();
		}
	}

isAssignableFrom

驗證類別是否可以被指定類別繼承，若不成立，則會拋出 AssertionError 。

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

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

interface java.lang.CharSequence
class java.lang.Number

isPackagePrivate

Examples AssertJ Class Unit Test 驗證類別 Package 是否私有，若不成立，則會拋出 AssertionError 。

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

class org.ruoxue.spring_boot_168.test.assertj.clazz.UnitTestAssertJClassWithExamplesTest$SuperFruit

isProtected

Examples AssertJ Class Unit Test 驗證類別是否為保護，若不成立，則會拋出 AssertionError 。

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

class org.ruoxue.spring_boot_168.test.assertj.clazz.UnitTestAssertJClassWithExamplesTest$Fruit

isPublic

Examples AssertJ Class Unit Test 驗證類別是否為公用，若不成立，則會拋出 AssertionError 。

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

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

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

isStatic

Examples AssertJ Class Unit Test 驗證類別是否為靜態，若不成立，則會拋出 AssertionError 。

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

class org.ruoxue.spring_boot_168.test.assertj.clazz.UnitTestAssertJClassWithExamplesTest$SuperFruit

isNotStatic

Examples Unit Test AssertJ Class 驗證類別是否非靜態，若不成立，則會拋出 AssertionError 。

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

class org.ruoxue.spring_boot_168.test.assertj.clazz.UnitTestAssertJClassWithExamplesTest$Fruit

UnitTestAssertJClassWithExamplesTest.java

Examples Unit Test AssertJ Class 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.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
import org.junit.jupiter.api.Test;

import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;

public class UnitTestAssertJClassWithExamplesTest {

	@NoArgsConstructor
	@Getter
	@Setter
	static class SuperFruit {
		private String id;

		public String toString() {
			ToStringBuilder builder = new ToStringBuilder(this, ToStringStyle.JSON_STYLE);
			builder.appendSuper(super.toString());
			builder.append("id", id);
			return builder.toString();
		}
	}

	@NoArgsConstructor
	@Getter
	@Setter
	protected class Fruit extends SuperFruit {
		private String name;
		private double quantity;
		private int type;

		public Fruit(String name, double quantity, int type) {
			this.name = name;
			this.quantity = quantity;
			this.type = type;
		}

		public String toString() {
			ToStringBuilder builder = new ToStringBuilder(this, ToStringStyle.JSON_STYLE);
			builder.appendSuper(super.toString());
			builder.append("name", name);
			builder.append("quantity", quantity);
			builder.append("type", type);
			return builder.toString();
		}
	}

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

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

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

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

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

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

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

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

心得分享

Unit Test AssertJ Class Example 斷言的基本方法是 assertThat 方法，提高了測試程式碼的可讀性，並且被設計為在主流 IDE 中易於使用，讓開發者將繁瑣的測試驗證過程，變為更簡單，善用 Examples Unit Test AssertJ Class 將有助於驗證效率的提升。