Asserting Lists Methods - AssertJ 155

Asserting Lists Methods – AssertJ 155

Asserting Lists Methods

驗證 List 抽取滿足條件的元素,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, Lists Methods Asserting 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
       |                       +- list
       |                           +- AssertingListsMethodsTest.java   

單元測試

Lists Methods AssertJ 斷言集合的主要目的是取得集合的正確元素以進行斷言。

Fruit

Lists Methods AssertJ 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
	@Builder
	public static class Fruit {
		private String name;
		private double quantity;
		private int type;
		private List<String> origins = new ArrayList<>();

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

		public Fruit(String name, double quantity, int type) {
			this(name, quantity, type, new ArrayList<>());
		}

		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);
			builder.append("origins", origins);
			return builder.toString();
		}
	}

extracting

Lists Methods AssertJ 驗證提取元素屬性符合條件,若不成立,則會拋出 AssertionError 。

	@Test
	public void extracting() {
		Fruit apple = new Fruit("Apple", Double.MAX_VALUE, 1);
		Fruit banana = new Fruit("Banana", 1, 2);
		Fruit cherry = new Fruit("Cherry", -1, 3);
		List<Fruit> list = Arrays.asList(apple, banana, cherry);
		System.out.println(list);
		assertThat(list).extracting(e -> e.getName()).contains("Apple", "Banana");
		assertThat(list).extracting(e -> e.getType()).containsOnly(1, 2, 3);
	}
[{"name":"Apple","quantity":1.7976931348623157E308,"type":1,"origins":[]}, {"name":"Banana","quantity":1.0,"type":2,"origins":[]}, {"name":"Cherry","quantity":-1.0,"type":3,"origins":[]}]

extractingWithFieldName

Lists Methods AssertJ 驗證取得根據類名或方法引用或屬性名反射調用,或根據 lambda 表達式調用,提取元素屬性符合條件,若不成立,則會拋出 AssertionError 。

	@Test
	public void extractingWithFieldName() {
		Fruit apple = new Fruit("Apple", Double.MAX_VALUE, 1);
		Fruit banana = new Fruit("Banana", 1, 2);
		Fruit cherry = new Fruit("Cherry", -1, 3);
		List<Fruit> list = Arrays.asList(apple, banana, cherry);
		System.out.println(list);
		assertThat(list).extracting("name").containsAll(Arrays.asList("Apple", "Banana"));
		assertThat(list).extracting("type").containsExactly(1, 2, 3);
	}
[{"name":"Apple","quantity":1.7976931348623157E308,"type":1,"origins":[]}, {"name":"Banana","quantity":1.0,"type":2,"origins":[]}, {"name":"Cherry","quantity":-1.0,"type":3,"origins":[]}]

extractingWithMethodReference

Lists Methods AssertJ 驗證依方法參考調用,提取元素屬性符合條件,若不成立,則會拋出 AssertionError 。

	@Test
	public void extractingWithMethodReference() {
		Fruit apple = new Fruit("Apple", Double.MAX_VALUE, 1);
		Fruit banana = new Fruit("Banana", 1, 2);
		Fruit cherry = new Fruit("Cherry", -1, 3);
		List<Fruit> list = Arrays.asList(apple, banana, cherry);
		System.out.println(list);
		assertThat(list).extracting(Fruit::getName).containsExactlyInAnyOrder("Cherry", "Apple", "Banana");
		assertThat(list).extracting(Fruit::getType).containsAnyOf(1, 2);
	}
[{"name":"Apple","quantity":1.7976931348623157E308,"type":1,"origins":[]}, {"name":"Banana","quantity":1.0,"type":2,"origins":[]}, {"name":"Cherry","quantity":-1.0,"type":3,"origins":[]}]

extractingTuple

Lists Methods with AssertJ 驗證將一組屬性的值包裝成組合,提取元素屬性符合條件,若不成立,則會拋出 AssertionError 。

	@Test
	public void extractingTuple() {
		Fruit apple = new Fruit("Apple", Double.MAX_VALUE, 1);
		Fruit banana = new Fruit("Banana", 1, 2);
		Fruit cherry = new Fruit("Cherry", -1, 3);
		List<Fruit> list = Arrays.asList(apple, banana, cherry);
		System.out.println(list);
		assertThat(list).extracting("name", "quantity").containsSequence(tuple("Banana", 1d), tuple("Cherry", -1d));
		assertThat(list).extracting(e -> e.getName(), Fruit::getQuantity)
				.containsSubsequence(tuple("Apple", Double.MAX_VALUE), tuple("Cherry", -1d));
	}
[{"name":"Apple","quantity":1.7976931348623157E308,"type":1,"origins":[]}, {"name":"Banana","quantity":1.0,"type":2,"origins":[]}, {"name":"Cherry","quantity":-1.0,"type":3,"origins":[]}]

extractingResultOf

Lists Methods with AssertJ 驗證依方法提取元素屬性符合條件,若不成立,則會拋出 AssertionError 。

	@Test
	public void extractingResultOf() {
		Fruit apple = new Fruit("Apple", Double.MAX_VALUE, 1);
		Fruit banana = new Fruit("Banana", 1, 2);
		Fruit cherry = new Fruit("Cherry", -1, 3);
		List<Fruit> list = Arrays.asList(apple, banana, cherry);
		System.out.println(list);
		assertThat(list).extractingResultOf("getName").doesNotContainNull();
		assertThat(list).extractingResultOf("getQuantity", Double.class).hasSize(3);
	}
[{"name":"Apple","quantity":1.7976931348623157E308,"type":1,"origins":[]}, {"name":"Banana","quantity":1.0,"type":2,"origins":[]}, {"name":"Cherry","quantity":-1.0,"type":3,"origins":[]}]

flatExtracting

Lists Methods with AssertJ 驗證取得根據類名或方法引用或屬性名反射調用,或根據 lambda 表達式調用,提取元素屬性符合條件,若不成立,則會拋出 AssertionError 。

	@Test
	public void flatExtracting() {
		Fruit apple = new Fruit("Apple", Double.MAX_VALUE, 1, Arrays.asList("Australia"));
		Fruit banana = new Fruit("Banana", 1, 2, Arrays.asList("Canada", "Norway"));
		Fruit cherry = new Fruit("Cherry", -1, 3, Arrays.asList("Poland", "Japan"));
		List<Fruit> list = Arrays.asList(apple, banana, cherry);
		System.out.println(list);
		assertThat(list).flatExtracting("origins").containsOnly("Australia", "Canada", "Norway", "Poland", "Japan");
	}
[{"name":"Apple","quantity":1.7976931348623157E308,"type":1,"origins":[Australia]}, {"name":"Banana","quantity":1.0,"type":2,"origins":[Canada, Norway]}, {"name":"Cherry","quantity":-1.0,"type":3,"origins":[Poland, Japan]}]

flatExtractingWithMethodReference

Lists Methods with AssertJ 驗證依方法參考調用,提取元素屬性符合條件,若不成立,則會拋出 AssertionError 。

	@Test
	public void flatExtractingWithMethodReference() {
		Fruit apple = new Fruit("Apple", Double.MAX_VALUE, 1, Arrays.asList("Australia"));
		Fruit banana = new Fruit("Banana", 1, 2, Arrays.asList("Canada", "Norway"));
		Fruit cherry = new Fruit("Cherry", -1, 3, Arrays.asList("Poland", "Japan"));
		List<Fruit> list = Arrays.asList(apple, banana, cherry);
		System.out.println(list);
		assertThat(list).flatExtracting(Fruit::getOrigins).containsOnly("Australia", "Canada", "Norway", "Poland",
				"Japan");
	}
[{"name":"Apple","quantity":1.7976931348623157E308,"type":1,"origins":[Australia]}, {"name":"Banana","quantity":1.0,"type":2,"origins":[Canada, Norway]}, {"name":"Cherry","quantity":-1.0,"type":3,"origins":[Poland, Japan]}]

AssertingListsMethodsTest.java

Lists Methods with AssertJ 新增單元測試,驗證是否符合預期。

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

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

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
import org.junit.jupiter.api.Test;

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

public class AssertingListsMethodsTest {

	@NoArgsConstructor
	@Getter
	@Setter
	@Builder
	public static class Fruit {
		private String name;
		private double quantity;
		private int type;
		private List<String> origins = new ArrayList<>();

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

		public Fruit(String name, double quantity, int type) {
			this(name, quantity, type, new ArrayList<>());
		}

		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);
			builder.append("origins", origins);
			return builder.toString();
		}
	}

	@Test
	public void extracting() {
		Fruit apple = new Fruit("Apple", Double.MAX_VALUE, 1);
		Fruit banana = new Fruit("Banana", 1, 2);
		Fruit cherry = new Fruit("Cherry", -1, 3);
		List<Fruit> list = Arrays.asList(apple, banana, cherry);
		System.out.println(list);
		assertThat(list).extracting(e -> e.getName()).contains("Apple", "Banana");
		assertThat(list).extracting(e -> e.getType()).containsOnly(1, 2, 3);
	}

	@Test
	public void extractingWithFieldName() {
		Fruit apple = new Fruit("Apple", Double.MAX_VALUE, 1);
		Fruit banana = new Fruit("Banana", 1, 2);
		Fruit cherry = new Fruit("Cherry", -1, 3);
		List<Fruit> list = Arrays.asList(apple, banana, cherry);
		System.out.println(list);
		assertThat(list).extracting("name").containsAll(Arrays.asList("Apple", "Banana"));
		assertThat(list).extracting("type").containsExactly(1, 2, 3);
	}

	@Test
	public void extractingWithMethodReference() {
		Fruit apple = new Fruit("Apple", Double.MAX_VALUE, 1);
		Fruit banana = new Fruit("Banana", 1, 2);
		Fruit cherry = new Fruit("Cherry", -1, 3);
		List<Fruit> list = Arrays.asList(apple, banana, cherry);
		System.out.println(list);
		assertThat(list).extracting(Fruit::getName).containsExactlyInAnyOrder("Cherry", "Apple", "Banana");
		assertThat(list).extracting(Fruit::getType).containsAnyOf(1, 2);
	}

	@Test
	public void extractingTuple() {
		Fruit apple = new Fruit("Apple", Double.MAX_VALUE, 1);
		Fruit banana = new Fruit("Banana", 1, 2);
		Fruit cherry = new Fruit("Cherry", -1, 3);
		List<Fruit> list = Arrays.asList(apple, banana, cherry);
		System.out.println(list);
		assertThat(list).extracting("name", "quantity").containsSequence(tuple("Banana", 1d), tuple("Cherry", -1d));
		assertThat(list).extracting(e -> e.getName(), Fruit::getQuantity)
				.containsSubsequence(tuple("Apple", Double.MAX_VALUE), tuple("Cherry", -1d));
	}

	@Test
	public void extractingResultOf() {
		Fruit apple = new Fruit("Apple", Double.MAX_VALUE, 1);
		Fruit banana = new Fruit("Banana", 1, 2);
		Fruit cherry = new Fruit("Cherry", -1, 3);
		List<Fruit> list = Arrays.asList(apple, banana, cherry);
		System.out.println(list);
		assertThat(list).extractingResultOf("getName").doesNotContainNull();
		assertThat(list).extractingResultOf("getQuantity", Double.class).hasSize(3);
	}

	@Test
	public void flatExtracting() {
		Fruit apple = new Fruit("Apple", Double.MAX_VALUE, 1, Arrays.asList("Australia"));
		Fruit banana = new Fruit("Banana", 1, 2, Arrays.asList("Canada", "Norway"));
		Fruit cherry = new Fruit("Cherry", -1, 3, Arrays.asList("Poland", "Japan"));
		List<Fruit> list = Arrays.asList(apple, banana, cherry);
		System.out.println(list);
		assertThat(list).flatExtracting("origins").containsOnly("Australia", "Canada", "Norway", "Poland", "Japan");
	}

	@Test
	public void flatExtractingWithMethodReference() {
		Fruit apple = new Fruit("Apple", Double.MAX_VALUE, 1, Arrays.asList("Australia"));
		Fruit banana = new Fruit("Banana", 1, 2, Arrays.asList("Canada", "Norway"));
		Fruit cherry = new Fruit("Cherry", -1, 3, Arrays.asList("Poland", "Japan"));
		List<Fruit> list = Arrays.asList(apple, banana, cherry);
		System.out.println(list);
		assertThat(list).flatExtracting(Fruit::getOrigins).containsOnly("Australia", "Canada", "Norway", "Poland",
				"Japan");
	}
}

心得分享

Lists Functions with AssertJ 除了提供流式判斷,還針對 Array 做特殊判斷,在許多測試驗證的場景,讓開發者使用更流暢的驗證,不需要再寫迴圈,善用 Lists Methods with AssertJ 將有助於驗證效率的提升。

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