Unit Test Array 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 Array 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
       |                       +- array
       |                           +- UnitTestArrayWithAssertJTest.java

單元測試

Java AssertJ Array Unit Test 斷言陣列的主要目的是取得陣列的正確元素以進行斷言。

is

驗證是否符合條件，若不成立，則會拋出 AssertionError 。

	@Test
	public void is() {
		String[] array = new String[] { "Durian", "Guava", "Pitaya" };
		Condition<String[]> length = new Condition<String[]>(s -> s.length > 2, "length");
		System.out.println(Arrays.toString(array));
		assertThat(array).is(length);

		int[] intArray = new int[] { 1, 2, 3, 4, 5 };
		System.out.println(Arrays.toString(intArray));
		Condition<int[]> intLength = new Condition<int[]>(i -> i.length > 2, "length");
		assertThat(intArray).is(intLength);
	}

[Durian, Guava, Pitaya]
[1, 2, 3, 4, 5]

isNot

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

	@Test
	public void isNot() {
		String[] array = new String[] { "Durian", "Guava", "Pitaya" };
		System.out.println(Arrays.toString(array));
		Condition<String[]> length = new Condition<String[]>(s -> s.length > 3, "length");
		assertThat(array).isNot(length);

		int[] intArray = new int[] { 1, 2, 3, 4, 5 };
		System.out.println(Arrays.toString(intArray));
		Condition<int[]> intLength = new Condition<int[]>(i -> i.length > 5, "length");
		assertThat(intArray).isNot(intLength);
	}

[Durian, Guava, Pitaya]
[1, 2, 3, 4, 5]

isIn

Java AssertJ Array 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() {
		String[] array = new String[] { "Durian", "Guava", "Pitaya" };
		System.out.println(Arrays.toString(array));
		assertThat("Guava").isIn(array);

		Integer[] intArray = new Integer[] { 1, 2, 3, 4, 5 };
		System.out.println(Arrays.toString(intArray));
		assertThat(3).isIn(intArray);
	}

[Durian, Guava, Pitaya]
[1, 2, 3, 4, 5]

isNotIn

Java AssertJ Array 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[] array = new String[] { "Durian", "Guava", "Pitaya" };
		System.out.println(Arrays.toString(array));
		assertThat("Mango").isNotIn(array);

		Integer[] intArray = new Integer[] { 1, 2, 3, 4, 5 };
		System.out.println(Arrays.toString(intArray));
		assertThat(9).isNotIn(intArray);
	}

[Durian, Guava, Pitaya]
[1, 2, 3, 4, 5]

isInstanceOf

Java AssertJ Array 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() {
		String[] array = new String[] { "Durian", "Guava", "Pitaya" };
		System.out.println(Arrays.toString(array));
		assertThat(array).isInstanceOf(String[].class);

		int[] intArray = new int[] { 1, 2, 3, 4, 5 };
		System.out.println(Arrays.toString(intArray));
		assertThat(intArray).isInstanceOf(int[].class);
	}

[Durian, Guava, Pitaya]
[1, 2, 3, 4, 5]

isNotInstanceOf

Java AssertJ Array 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() {
		String[] array = new String[] { "Durian", "Guava", "Pitaya" };
		System.out.println(Arrays.toString(array));
		assertThat(array).isNotInstanceOf(String.class);

		int[] intArray = new int[] { 1, 2, 3, 4, 5 };
		System.out.println(Arrays.toString(intArray));
		assertThat(intArray).isNotInstanceOf(int.class);
	}

[Durian, Guava, Pitaya]
[1, 2, 3, 4, 5]

startsWith

Java Unit Test AssertJ Array 驗證是否為第一個元素，若不成立，則會拋出 AssertionError 。

	@Test
	public void startsWith() {
		String[] array = new String[] { "Durian", "Guava", "Pitaya" };
		System.out.println(Arrays.toString(array));
		assertThat(array).startsWith("Durian");

		int[] intArray = new int[] { 1, 2, 3, 4, 5 };
		System.out.println(Arrays.toString(intArray));
		assertThat(intArray).startsWith(1);
	}

[Durian, Guava, Pitaya]
[1, 2, 3, 4, 5]

endsWith

Java Unit Test AssertJ Array 驗證是否為最後個元素，若不成立，則會拋出 AssertionError 。

	@Test
	public void endsWith() {
		String[] array = new String[] { "Durian", "Guava", "Pitaya" };
		System.out.println(Arrays.toString(array));
		assertThat(array).endsWith("Pitaya");

		int[] intArray = new int[] { 1, 2, 3, 4, 5 };
		System.out.println(Arrays.toString(intArray));
		assertThat(intArray).endsWith(5);
	}

[Durian, Guava, Pitaya]
[1, 2, 3, 4, 5]

UnitTestArrayWithAssertJTest.java

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

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

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

import java.util.Arrays;

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

public class UnitTestArrayWithAssertJTest {

	@Test
	public void is() {
		String[] array = new String[] { "Durian", "Guava", "Pitaya" };
		Condition<String[]> length = new Condition<String[]>(s -> s.length > 2, "length");
		System.out.println(Arrays.toString(array));
		assertThat(array).is(length);

		int[] intArray = new int[] { 1, 2, 3, 4, 5 };
		System.out.println(Arrays.toString(intArray));
		Condition<int[]> intLength = new Condition<int[]>(i -> i.length > 2, "length");
		assertThat(intArray).is(intLength);
	}

	@Test
	public void isNot() {
		String[] array = new String[] { "Durian", "Guava", "Pitaya" };
		System.out.println(Arrays.toString(array));
		Condition<String[]> length = new Condition<String[]>(s -> s.length > 3, "length");
		assertThat(array).isNot(length);

		int[] intArray = new int[] { 1, 2, 3, 4, 5 };
		System.out.println(Arrays.toString(intArray));
		Condition<int[]> intLength = new Condition<int[]>(i -> i.length > 5, "length");
		assertThat(intArray).isNot(intLength);
	}

	@Test
	public void isIn() {
		String[] array = new String[] { "Durian", "Guava", "Pitaya" };
		System.out.println(Arrays.toString(array));
		assertThat("Guava").isIn(array);

		Integer[] intArray = new Integer[] { 1, 2, 3, 4, 5 };
		System.out.println(Arrays.toString(intArray));
		assertThat(3).isIn(intArray);
	}

	@Test
	public void isNotIn() {
		String[] array = new String[] { "Durian", "Guava", "Pitaya" };
		System.out.println(Arrays.toString(array));
		assertThat("Mango").isNotIn(array);

		Integer[] intArray = new Integer[] { 1, 2, 3, 4, 5 };
		System.out.println(Arrays.toString(intArray));
		assertThat(9).isNotIn(intArray);
	}

	@Test
	public void isInstanceOf() {
		String[] array = new String[] { "Durian", "Guava", "Pitaya" };
		System.out.println(Arrays.toString(array));
		assertThat(array).isInstanceOf(String[].class);

		int[] intArray = new int[] { 1, 2, 3, 4, 5 };
		System.out.println(Arrays.toString(intArray));
		assertThat(intArray).isInstanceOf(int[].class);
	}

	@Test
	public void isNotInstanceOf() {
		String[] array = new String[] { "Durian", "Guava", "Pitaya" };
		System.out.println(Arrays.toString(array));
		assertThat(array).isNotInstanceOf(String.class);

		int[] intArray = new int[] { 1, 2, 3, 4, 5 };
		System.out.println(Arrays.toString(intArray));
		assertThat(intArray).isNotInstanceOf(int.class);
	}

	@Test
	public void startsWith() {
		String[] array = new String[] { "Durian", "Guava", "Pitaya" };
		System.out.println(Arrays.toString(array));
		assertThat(array).startsWith("Durian");

		int[] intArray = new int[] { 1, 2, 3, 4, 5 };
		System.out.println(Arrays.toString(intArray));
		assertThat(intArray).startsWith(1);
	}

	@Test
	public void endsWith() {
		String[] array = new String[] { "Durian", "Guava", "Pitaya" };
		System.out.println(Arrays.toString(array));
		assertThat(array).endsWith("Pitaya");

		int[] intArray = new int[] { 1, 2, 3, 4, 5 };
		System.out.println(Arrays.toString(intArray));
		assertThat(intArray).endsWith(5);
	}
}

心得分享

AssertJ Array 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 Array 將有助於驗證效率的提升。