Unit Test Object with AssertJ - AssertJ 155

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Unit Test Object with AssertJ - AssertJ 155

提供了一組豐富的斷言和真正有用的錯誤訊息，提高了測試程式碼的可讀性，通常與 JUnit 測試一起使用， Unit Test Java AssertJ Object 流式斷言，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
       |                       +- object
       |                           +- UnitTestObjectWithAssertJTest.java

單元測試

Java AssertJ Object Unit Test 斷言物件的主要目的是取得物件以進行斷言。

is

驗證是否符合條件，若不成立，則會拋出 AssertionError 。

	@Test
	public void is() {
		Object value = "AssertJ";
		System.out.println(value);
		Condition<Object> equals = new Condition<Object>(o -> o.equals("AssertJ"), "equals");
		assertThat(value).is(equals);

		value = BigDecimal.valueOf(155);
		System.out.println(value);
		Condition<Object> toString = new Condition<Object>(o -> o.toString().equals("155"), "toString");
		assertThat(value).is(toString);
	}

AssertJ
155

isNot

Java AssertJ Object Unit Test 驗證是否不符合條件，若不成立，則會拋出 AssertionError 。

	@Test
	public void isNot() {
		Object value = "AssertJ";
		System.out.println(value);
		Condition<Object> equals = new Condition<Object>(o -> o.equals("155"), "equals");
		assertThat(value).isNot(equals);

		value = BigDecimal.valueOf(155);
		System.out.println(value);
		Condition<Object> toString = new Condition<Object>(o -> o.toString().equals("AssertJ"), "toString");
		assertThat(value).isNot(toString);
	}

AssertJ
155

isIn

Java AssertJ Object Unit Test 驗證是否包含於陣列中，若不成立，則會拋出 AssertionError 。

	@Test
	public void isIn() {
		Object value = "AssertJ";
		System.out.println(value);
		assertThat(value).isIn("AssertJ", "JUnit");

		value = BigDecimal.valueOf(155);
		System.out.println(value);
		assertThat(value).isIn(BigDecimal.valueOf(155), BigDecimal.valueOf(151));
	}

AssertJ 
155

isNotIn

Java AssertJ Object Unit Test 驗證是否不包含於陣列中，若不成立，則會拋出 AssertionError 。

	@Test
	public void isNotIn() {
		Object value = "AssertJ";
		System.out.println(value);
		assertThat(value).isNotIn("JUnit", "Mockito");

		value = BigDecimal.valueOf(155);
		System.out.println(value);
		assertThat(value).isNotIn(BigDecimal.valueOf(151), BigDecimal.valueOf(152));
	}

AssertJ 
155

isInstanceOf

Java AssertJ Object Unit Test 驗證是否為指定類別實例，若不成立，則會拋出 AssertionError 。

	@Test
	public void isInstanceOf() {
		Object value = "AssertJ";
		System.out.println(value);
		assertThat(value).isInstanceOf(String.class);

		value = BigDecimal.valueOf(155);
		System.out.println(value);
		assertThat(value).isInstanceOf(BigDecimal.class);
	}

AssertJ
155

isNotInstanceOf

Java AssertJ Object Unit Test 驗證是否不為指定類別實例，若不成立，則會拋出 AssertionError 。

	@Test
	public void isNotInstanceOf() {
		Object value = "AssertJ";
		System.out.println(value);
		assertThat(value).isNotInstanceOf(String[].class);

		value = BigDecimal.valueOf(155);
		System.out.println(value);
		assertThat(value).isNotInstanceOf(BigDecimal[].class);
	}

AssertJ
155

UnitTestObjectWithAssertJTest.java

Java Unit Test AssertJ Object 新增單元測試，驗證是否符合預期。

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

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

import java.math.BigDecimal;

import org.assertj.core.api.Condition;
import org.junit.jupiter.api.Test;

public class UnitTestObjectWithAssertJTest {

	@Test
	public void is() {
		Object value = "AssertJ";
		System.out.println(value);
		Condition<Object> equals = new Condition<Object>(o -> o.equals("AssertJ"), "equals");
		assertThat(value).is(equals);

		value = BigDecimal.valueOf(155);
		System.out.println(value);
		Condition<Object> toString = new Condition<Object>(o -> o.toString().equals("155"), "toString");
		assertThat(value).is(toString);
	}

	@Test
	public void isNot() {
		Object value = "AssertJ";
		System.out.println(value);
		Condition<Object> equals = new Condition<Object>(o -> o.equals("155"), "equals");
		assertThat(value).isNot(equals);

		value = BigDecimal.valueOf(155);
		System.out.println(value);
		Condition<Object> toString = new Condition<Object>(o -> o.toString().equals("AssertJ"), "toString");
		assertThat(value).isNot(toString);
	}

	@Test
	public void isIn() {
		Object value = "AssertJ";
		System.out.println(value);
		assertThat(value).isIn("AssertJ", "JUnit");

		value = BigDecimal.valueOf(155);
		System.out.println(value);
		assertThat(value).isIn(BigDecimal.valueOf(155), BigDecimal.valueOf(151));
	}

	@Test
	public void isNotIn() {
		Object value = "AssertJ";
		System.out.println(value);
		assertThat(value).isNotIn("JUnit", "Mockito");

		value = BigDecimal.valueOf(155);
		System.out.println(value);
		assertThat(value).isNotIn(BigDecimal.valueOf(151), BigDecimal.valueOf(152));
	}

	@Test
	public void isInstanceOf() {
		Object value = "AssertJ";
		System.out.println(value);
		assertThat(value).isInstanceOf(String.class);

		value = BigDecimal.valueOf(155);
		System.out.println(value);
		assertThat(value).isInstanceOf(BigDecimal.class);
	}

	@Test
	public void isNotInstanceOf() {
		Object value = "AssertJ";
		System.out.println(value);
		assertThat(value).isNotInstanceOf(String[].class);

		value = BigDecimal.valueOf(155);
		System.out.println(value);
		assertThat(value).isNotInstanceOf(BigDecimal[].class);
	}
}

心得分享

AssertJ Object Java Unit Test 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 Java Unit Test AssertJ Object 將有助於驗證效率的提升。