Unit Test Number with AssertJ

Table of Contents

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 Number 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
       |                       +- number
       |                           +- UnitTestNumberWithAssertJTest.java

單元測試

Java AssertJ Number Unit Test 斷言數字的主要目的是取得數字以進行斷言。

is

驗證是否符合條件，若不成立，則會拋出 AssertionError 。

	@Test
	public void is() {
		int value = 1;
		System.out.println(value);
		Condition<Integer> greaterThan = new Condition<Integer>(i -> i > 0, "greaterThan");
		assertThat(value).is(greaterThan);

		double doubleValue = 1d;
		System.out.println(doubleValue);
		Condition<Double> doubleGreaterThan = new Condition<Double>(i -> Double.compare(i, 0) == 1,
				"doubleGreaterThan");
		assertThat(doubleValue).is(doubleGreaterThan);
	}

1
1.0

isNot

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

	@Test
	public void isNot() {
		int value = 1;
		System.out.println(value);
		Condition<Integer> greaterThan = new Condition<Integer>(i -> i < 0, "greaterThan");
		assertThat(value).isNot(greaterThan);

		double doubleValue = 1d;
		System.out.println(doubleValue);
		Condition<Double> doubleGreaterThan = new Condition<Double>(i -> Double.compare(i, 0) == -1,
				"doubleGreaterThan");
		assertThat(doubleValue).isNot(doubleGreaterThan);
	}

1
1.0

isIn

Java AssertJ Number 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() {
		int value = 1;
		System.out.println(value);
		assertThat(value).isIn(1, 3, 5);

		double doubleValue = 1d;
		System.out.println(doubleValue);
		assertThat(doubleValue).isIn(1d, 2d, 3d);
	}

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1.0

isNotIn

Java AssertJ Number 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() {
		String value = "AssertJ";
		System.out.println(value);
		assertThat(value).isNotIn("JUnit", "151");

		value = "155";
		System.out.println(value);
		assertThat(value).isNotIn("JUnit", "151");
	}

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1.0

isInstanceOf

Java AssertJ Number 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() {
		int value = 1;
		System.out.println(value);
		assertThat(value).isInstanceOf(Integer.class);

		double doubleValue = 1d;
		System.out.println(doubleValue);
		assertThat(doubleValue).isInstanceOf(Double.class);
	}

1
1.0

isNotInstanceOf

Java AssertJ Number 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() {
		int value = 1;
		System.out.println(value);
		assertThat(value).isNotInstanceOf(int.class);

		double doubleValue = 1d;
		System.out.println(doubleValue);
		assertThat(doubleValue).isNotInstanceOf(double.class);
	}

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1.0

UnitTestNumberWithAssertJTest.java

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

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

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

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

public class UnitTestNumberWithAssertJTest {

	@Test
	public void is() {
		int value = 1;
		System.out.println(value);
		Condition<Integer> greaterThan = new Condition<Integer>(i -> i > 0, "greaterThan");
		assertThat(value).is(greaterThan);

		double doubleValue = 1d;
		System.out.println(doubleValue);
		Condition<Double> doubleGreaterThan = new Condition<Double>(i -> Double.compare(i, 0) == 1,
				"doubleGreaterThan");
		assertThat(doubleValue).is(doubleGreaterThan);
	}

	@Test
	public void isNot() {
		int value = 1;
		System.out.println(value);
		Condition<Integer> greaterThan = new Condition<Integer>(i -> i < 0, "greaterThan");
		assertThat(value).isNot(greaterThan);

		double doubleValue = 1d;
		System.out.println(doubleValue);
		Condition<Double> doubleGreaterThan = new Condition<Double>(i -> Double.compare(i, 0) == -1,
				"doubleGreaterThan");
		assertThat(doubleValue).isNot(doubleGreaterThan);
	}

	@Test
	public void isIn() {
		int value = 1;
		System.out.println(value);
		assertThat(value).isIn(1, 3, 5);

		double doubleValue = 1d;
		System.out.println(doubleValue);
		assertThat(doubleValue).isIn(1d, 2d, 3d);
	}

	@Test
	public void isNotIn() {
		int value = 1;
		System.out.println(value);
		assertThat(value).isNotIn(2, 4, 6);

		double doubleValue = 1d;
		System.out.println(doubleValue);
		assertThat(doubleValue).isNotIn(2d, 4d, 6d);
	}

	@Test
	public void isInstanceOf() {
		int value = 1;
		System.out.println(value);
		assertThat(value).isInstanceOf(Integer.class);

		double doubleValue = 1d;
		System.out.println(doubleValue);
		assertThat(doubleValue).isInstanceOf(Double.class);
	}

	@Test
	public void isNotInstanceOf() {
		int value = 1;
		System.out.println(value);
		assertThat(value).isNotInstanceOf(int.class);

		double doubleValue = 1d;
		System.out.println(doubleValue);
		assertThat(doubleValue).isNotInstanceOf(double.class);
	}
}

心得分享

AssertJ Number 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 Number 將有助於驗證效率的提升。