AssertJ Number in Java with Examples

Table of Contents

為用 Java 編寫的測試程式提供了流暢的斷言語句，這些斷言語句通常與 JUnit 測試一起使用， AssertJ 斷言的基本方法是 assertThat 方法，驗證 Number 是否相同大小、傳回值等， AssertJ Number 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
       |                           +- AssertJNumberWithExamplesTest.java

單元測試

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

has

驗證是否符合條件，若不成立，則會拋出 AssertionError 。

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

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

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hasToString

AssertJ Number Java 驗證 toString 是否相等，若不成立，則會拋出 AssertionError 。

	@Test
	public void hasToString() {
		int value = 0;
		System.out.println(value);
		assertThat(value).hasToString(Integer.valueOf(value).toString());

		double doubleValue = 0d;
		System.out.println(doubleValue);
		assertThat(doubleValue).hasToString(Double.valueOf(doubleValue).toString());
	}

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hasSameClassAs

AssertJ Number Java 驗證類別是否相同，若不成立，則會拋出 AssertionError 。

	@Test
	public void hasSameClassAs() {
		int value = 0;
		System.out.println(value);
		assertThat(value).hasSameClassAs(0);

		double doubleValue = 0d;
		System.out.println(doubleValue);
		assertThat(doubleValue).hasSameClassAs(0d);
	}

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returns

AssertJ Number Java 驗證傳回值是否符合預期，若不成立，則會拋出 AssertionError 。

	@Test
	public void returns() {
		int value = 0;
		System.out.println(value);
		assertThat(value).returns(1, i -> new Integer(i + 1));

		double doubleValue = 0d;
		System.out.println(doubleValue);
		assertThat(doubleValue).returns(1d, i -> new Double(i + 1));
	}

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doesNotHave

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

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

		double doubleValue = 0d;
		System.out.println(doubleValue);
		Condition<Double> doubleNotEquals = new Condition<Double>(i -> Double.compare(i, 0) != 0, "notEquals");
		assertThat(doubleValue).doesNotHave(doubleNotEquals);
	}

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doesNotHaveSameClassAs

Java AssertJ Number 驗證類別是否不相同，若不成立，則會拋出 AssertionError 。

	@Test
	public void doesNotHaveSameClassAs() {
		int value = 0;
		System.out.println(value);
		assertThat(value).doesNotHaveSameClassAs(0d);

		double doubleValue = 0d;
		System.out.println(doubleValue);
		assertThat(doubleValue).doesNotHaveSameClassAs(0);
	}

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doesNotReturn

Java AssertJ Number 驗證傳回值是否不符合預期，若不成立，則會拋出 AssertionError 。

	@Test
	public void doesNotReturn() {
		int value = 0;
		System.out.println(value);
		assertThat(value).doesNotReturn(2, i -> new Integer(i + 1));

		double doubleValue = 0d;
		System.out.println(doubleValue);
		assertThat(doubleValue).doesNotReturn(2d, i -> new Double(i + 1));
	}

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AssertJNumberWithExamplesTest.java

Java 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.*;

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

public class AssertJNumberWithExamplesTest {

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

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

	@Test
	public void hasToString() {
		int value = 0;
		System.out.println(value);
		assertThat(value).hasToString(Integer.valueOf(value).toString());

		double doubleValue = 0d;
		System.out.println(doubleValue);
		assertThat(doubleValue).hasToString(Double.valueOf(doubleValue).toString());
	}

	@Test
	public void hasSameClassAs() {
		int value = 0;
		System.out.println(value);
		assertThat(value).hasSameClassAs(0);

		double doubleValue = 0d;
		System.out.println(doubleValue);
		assertThat(doubleValue).hasSameClassAs(0d);
	}

	@Test
	public void returns() {
		int value = 0;
		System.out.println(value);
		assertThat(value).returns(1, i -> new Integer(i + 1));

		double doubleValue = 0d;
		System.out.println(doubleValue);
		assertThat(doubleValue).returns(1d, i -> new Double(i + 1));
	}

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

		double doubleValue = 0d;
		System.out.println(doubleValue);
		Condition<Double> doubleNotEquals = new Condition<Double>(i -> Double.compare(i, 0) != 0, "notEquals");
		assertThat(doubleValue).doesNotHave(doubleNotEquals);
	}

	@Test
	public void doesNotHaveSameClassAs() {
		int value = 0;
		System.out.println(value);
		assertThat(value).doesNotHaveSameClassAs(0d);

		double doubleValue = 0d;
		System.out.println(doubleValue);
		assertThat(doubleValue).doesNotHaveSameClassAs(0);
	}

	@Test
	public void doesNotReturn() {
		int value = 0;
		System.out.println(value);
		assertThat(value).doesNotReturn(2, i -> new Integer(i + 1));

		double doubleValue = 0d;
		System.out.println(doubleValue);
		assertThat(doubleValue).doesNotReturn(2d, i -> new Double(i + 1));
	}
}