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Asserting Numbers with AssertJ - AssertJ 155

Asserting Numbers with AssertJ – AssertJ 155

Asserting Numbers with AssertJ

介紹 matches 、 satisfies 驗證是否符合條件，類似的流暢或鍊式寫法，語法跟自然語言相近，對於編寫測試時力求容易閱讀及維護這之上提供了相當大的改進， Assert Numbers in Java 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
       |                           +- AssertingNumbersTest.java

單元測試

Assertions Numbers in Java 斷言數字的主要目的是取得數字以進行斷言。

matches

Assertions Numbers in Java 驗證是否符合條件，若不成立，則會拋出 AssertionError 。

	@Test
	public void matches() {
		int value = 155;
		System.out.println(value);
		assertThat(value).matches(i -> i > 150);

		double doubleValue = 151.2d;
		System.out.println(doubleValue);
		assertThat(doubleValue).matches(i -> Double.compare(i, 155) < 0);
	}
155
151.2

matchesWithDescription

Assertions Numbers in Java 驗證是否符合條件，自訂描述訊息，若不成立，則會拋出 AssertionError 。

	@Test
	public void matchesWithDescription() {
		int value = 155;
		System.out.println(value);
		assertThat(value).matches(i -> i > 150, "greaterThan");

		double doubleValue = 151.2d;
		System.out.println(doubleValue);
		assertThat(doubleValue).matches(i -> Double.compare(i, 155) < 0, "lessThan");
	}
155
151.2

matchesThrowError

Assertions Numbers in Java 驗證是否符合條件，自訂描述訊息，當不成立時，驗證拋出 AssertionError 。

	@Test
	public void matchesThrowError() {
		assertThatCode(() -> {
			int value = 155;
			System.out.println(value);
			assertThat(value).matches(i -> i < 150, "greaterThan");
		}).isInstanceOf(AssertionError.class);

		assertThatCode(() -> {
			double doubleValue = 151.2d;
			System.out.println(doubleValue);
			assertThat(doubleValue).matches(i -> Double.compare(i, 155) > 0, "lessThan");
		}).isInstanceOf(AssertionError.class);
	}
155
151.2

satisfies

Asserting Numbers with Examples 驗證是否符合條件，若不成立，則會拋出 AssertionError 。

	@Test
	public void satisfies() {
		int value = 155;
		System.out.println(value);
		assertThat(value).satisfies(i -> {
			assertThat(i).isNotZero();
			assertThat(i).isCloseTo(150, within(5));
		});

		double doubleValue = 151.2d;
		System.out.println(doubleValue);
		assertThat(doubleValue).satisfies(i -> {
			assertThat(i).isPositive();
		}, i -> {
			assertThat(i).isGreaterThan(150);
		});
	}
155
151.2

satisfiesAnyOf

Asserting Numbers with Examples 驗證是否符合任一條件，若不成立，則會拋出 AssertionError 。

	@Test
	public void satisfiesAnyOf() {
		int value = 155;
		System.out.println(value);
		assertThat(value).satisfiesAnyOf(i -> {
			assertThat(i).isNotZero();
			assertThat(i).isCloseTo(150, within(5));
		});

		double doubleValue = 151.2d;
		System.out.println(doubleValue);
		assertThat(doubleValue).satisfiesAnyOf(i -> {
			assertThat(i).isPositive();
		}, i -> {
			assertThat(i).isGreaterThan(155);
		});
	}
155
151.2

satisfiesThrowError

Asserting Numbers with Examples 驗證是否符合條件，當不成立時，驗證拋出 AssertionError 。

	@Test
	public void satisfiesThrowError() {
		assertThatCode(() -> {
			int value = 155;
			System.out.println(value);
			assertThat(value).satisfies(i -> {
				assertThat(i).isNotZero();
				assertThat(i).isCloseTo(170, within(5));
			});
		}).isInstanceOf(AssertionError.class);

		assertThatCode(() -> {
			double doubleValue = 151.2d;
			System.out.println(doubleValue);
			assertThat(doubleValue).satisfies(i -> {
				assertThat(i).isPositive();
			}, i -> {
				assertThat(i).isGreaterThan(160);
			});
		}).isInstanceOf(AssertionError.class);
	}
155
151.2

AssertingNumbersTest.java

Asserting Numbers with Examples 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 static org.assertj.core.api.Assertions.assertThatCode;
import static org.assertj.core.api.Assertions.within;

import org.junit.jupiter.api.Test;

public class AssertingNumbersTest {

	@Test
	public void matches() {
		int value = 155;
		System.out.println(value);
		assertThat(value).matches(i -> i > 150);

		double doubleValue = 151.2d;
		System.out.println(doubleValue);
		assertThat(doubleValue).matches(i -> Double.compare(i, 155) < 0);
	}

	@Test
	public void matchesWithDescription() {
		int value = 155;
		System.out.println(value);
		assertThat(value).matches(i -> i > 150, "greaterThan");

		double doubleValue = 151.2d;
		System.out.println(doubleValue);
		assertThat(doubleValue).matches(i -> Double.compare(i, 155) < 0, "lessThan");
	}

	@Test
	public void matchesThrowError() {
		assertThatCode(() -> {
			int value = 155;
			System.out.println(value);
			assertThat(value).matches(i -> i < 150, "greaterThan");
		}).isInstanceOf(AssertionError.class);

		assertThatCode(() -> {
			double doubleValue = 151.2d;
			System.out.println(doubleValue);
			assertThat(doubleValue).matches(i -> Double.compare(i, 155) > 0, "lessThan");
		}).isInstanceOf(AssertionError.class);
	}

	@Test
	public void satisfies() {
		int value = 155;
		System.out.println(value);
		assertThat(value).satisfies(i -> {
			assertThat(i).isNotZero();
			assertThat(i).isCloseTo(150, within(5));
		});

		double doubleValue = 151.2d;
		System.out.println(doubleValue);
		assertThat(doubleValue).satisfies(i -> {
			assertThat(i).isPositive();
		}, i -> {
			assertThat(i).isGreaterThan(150);
		});
	}

	@Test
	public void satisfiesAnyOf() {
		int value = 155;
		System.out.println(value);
		assertThat(value).satisfiesAnyOf(i -> {
			assertThat(i).isNotZero();
			assertThat(i).isCloseTo(150, within(5));
		});

		double doubleValue = 151.2d;
		System.out.println(doubleValue);
		assertThat(doubleValue).satisfiesAnyOf(i -> {
			assertThat(i).isPositive();
		}, i -> {
			assertThat(i).isGreaterThan(155);
		});
	}

	@Test
	public void satisfiesThrowError() {
		assertThatCode(() -> {
			int value = 155;
			System.out.println(value);
			assertThat(value).satisfies(i -> {
				assertThat(i).isNotZero();
				assertThat(i).isCloseTo(170, within(5));
			});
		}).isInstanceOf(AssertionError.class);

		assertThatCode(() -> {
			double doubleValue = 151.2d;
			System.out.println(doubleValue);
			assertThat(doubleValue).satisfies(i -> {
				assertThat(i).isPositive();
			}, i -> {
				assertThat(i).isGreaterThan(160);
			});
		}).isInstanceOf(AssertionError.class);
	}
}

心得分享

Testing Java Numbers with AssertJ 快速檢查物件是否滿足所有提供的斷言，搭配使用 Predicate 與 ThrowingConsumer 等接口，根據 lambda 表達式調用，驗證是否成立，若不成立，則會拋出 AssertionError， Asserting Numbers with Examples 介紹 matches 、 satisfies 等方法，提供範例參考。

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