Testing with AssertJ Predicate in Java - AssertJ 155

Testing with AssertJ Predicate in Java – AssertJ 155

Testing with AssertJ Predicate in Java

提供驗證 Predicate 條件判斷等方法,編寫的測試程式使用流暢的斷言語句,通常與 JUnit 測試一起使用, AssertJ 斷言的基本方法是 assertThat 方法,使用 Testing Java AssertJ Predicate 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
       |                       +- predicate
       |                           +- TestingAssertJPredicateTest.java   

單元測試

Java AssertJ Predicate Testing 斷言 Predicate 的主要目的是取得 Predicate 以進行斷言。

rejectsAll

驗證是否拒絕條件,若不成立,則會拋出 AssertionError 。

	@Test
	public void rejectsAll() {
		Predicate<String> lengthGreaterThan = s -> s.length() > 3;
		System.out.println(lengthGreaterThan);
		assertThat(lengthGreaterThan).rejectsAll(newArrayList("155", "151"));

		Predicate<Integer> greaterThan = i -> i > 10;
		System.out.println(greaterThan);
		assertThat(greaterThan).rejectsAll(newArrayList(1, 2));
	}
org.ruoxue.spring_boot_168.test.assertj.predicate.TestingAssertJPredicateTest$$Lambda$277/1975546571@1f1c7bf6
org.ruoxue.spring_boot_168.test.assertj.predicate.TestingAssertJPredicateTest$$Lambda$282/1861781750@10e92f8f

rejectsAllWithNegate

Java AssertJ Predicate Testing 驗證是否符合條件,若不成立,則會拋出 AssertionError 。

	@Test
	public void rejectsAllWithNegate() {
		Predicate<String> lengthGreaterThan = s -> s.length() > 3;
		System.out.println(lengthGreaterThan.negate());
		assertThat(lengthGreaterThan.negate()).rejectsAll(newArrayList("AssertJ", "JUnit"));

		Predicate<Integer> greaterThan = i -> i > 10;
		System.out.println(greaterThan.negate());
		assertThat(greaterThan.negate()).rejectsAll(newArrayList(155, 151));
	}
java.util.function.Predicate$$Lambda$278/521960438@25b485ba
java.util.function.Predicate$$Lambda$278/521960438@7ce3cb8e

rejectsAllWithAnd

Java Testing AssertJ Predicate 驗證是否拒絕 and 條件,若不成立,則會拋出 AssertionError 。

	@Test
	public void rejectsAllWithAnd() {
		Predicate<String> startsWith = s -> s.startsWith("J");
		Predicate<String> endsWith = s -> s.endsWith("A");
		Predicate<String> predicate = startsWith.and(endsWith);
		System.out.println(predicate);
		assertThat(predicate).rejectsAll(newArrayList("AssertJ", "AJ"));

		Predicate<Integer> greaterThan = i -> i > 3;
		Predicate<Integer> lessThan = i -> i < 6;
		Predicate<Integer> intPredicate = greaterThan.and(lessThan);
		System.out.println(intPredicate);
		assertThat(intPredicate).rejectsAll(newArrayList(2, 7));
	}
java.util.function.Predicate$$Lambda$214/599491651@25b485ba
java.util.function.Predicate$$Lambda$214/599491651@78b66d36

rejectsAllWithOr

Java Testing AssertJ Predicate 驗證是否拒絕 or 條件,若不成立,則會拋出 AssertionError 。

	@Test
	public void rejectsAllWithOr() {
		Predicate<String> startsWith = s -> s.startsWith("t");
		Predicate<String> endsWith = s -> s.endsWith("A");
		Predicate<String> predicate = startsWith.or(endsWith);
		System.out.println(predicate);
		assertThat(predicate).rejectsAll(newArrayList("AssertJ", "JUnit"));

		Predicate<Integer> greaterThan = i -> i < 3;
		Predicate<Integer> lessThan = i -> i > 6;
		Predicate<Integer> intPredicate = greaterThan.or(lessThan);
		System.out.println(intPredicate);
		assertThat(intPredicate).rejectsAll(newArrayList(4, 5));
	}
java.util.function.Predicate$$Lambda$38/2034688500@25b485ba
java.util.function.Predicate$$Lambda$38/2034688500@78b66d36

rejectsAllWithChaining

Java Testing AssertJ Predicate 驗證是否拒絕鏈結條件,若不成立,則會拋出 AssertionError 。

	@Test
	public void rejectsAllWithChaining() {
		Predicate<String> isNull = Objects::isNull;
		Predicate<String> startsWith = s -> s.startsWith("t");
		Predicate<String> contains = Pattern.compile("\\wX").asPredicate();
		Predicate<String> chaining = isNull.and(startsWith).or(contains);
		System.out.println(chaining);
		assertThat(chaining).rejectsAll(newArrayList("AssertJ", "JUnit"));

		Predicate<Integer> intIsNull = Objects::isNull;
		Predicate<Integer> greaterThan = i -> i < 3;
		Predicate<Integer> lessThan = i -> i > 6;
		Predicate<Integer> intChaining = intIsNull.and(greaterThan).or(lessThan);
		System.out.println(intChaining);
		assertThat(intChaining).rejectsAll(newArrayList(4, 5));
	}
java.util.function.Predicate$$Lambda$38/2034688500@5d740a0f
java.util.function.Predicate$$Lambda$38/2034688500@69b2283a

TestingAssertJPredicateTest.java

Java Testing AssertJ Predicate 新增單元測試,驗證是否符合預期。

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

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.util.Lists.newArrayList;

import java.util.Objects;
import java.util.function.Predicate;
import java.util.regex.Pattern;

import org.junit.jupiter.api.Test;

public class TestingAssertJPredicateTest {

	@Test
	public void rejectsAll() {
		Predicate<String> lengthGreaterThan = s -> s.length() > 3;
		System.out.println(lengthGreaterThan);
		assertThat(lengthGreaterThan).rejectsAll(newArrayList("155", "151"));

		Predicate<Integer> greaterThan = i -> i > 10;
		System.out.println(greaterThan);
		assertThat(greaterThan).rejectsAll(newArrayList(1, 2));
	}

	@Test
	public void rejectsAllWithNegate() {
		Predicate<String> lengthGreaterThan = s -> s.length() > 3;
		System.out.println(lengthGreaterThan.negate());
		assertThat(lengthGreaterThan.negate()).rejectsAll(newArrayList("AssertJ", "JUnit"));

		Predicate<Integer> greaterThan = i -> i > 10;
		System.out.println(greaterThan.negate());
		assertThat(greaterThan.negate()).rejectsAll(newArrayList(155, 151));
	}

	@Test
	public void rejectsAllWithAnd() {
		Predicate<String> startsWith = s -> s.startsWith("J");
		Predicate<String> endsWith = s -> s.endsWith("A");
		Predicate<String> predicate = startsWith.and(endsWith);
		System.out.println(predicate);
		assertThat(predicate).rejectsAll(newArrayList("AssertJ", "AJ"));

		Predicate<Integer> greaterThan = i -> i > 3;
		Predicate<Integer> lessThan = i -> i < 6;
		Predicate<Integer> intPredicate = greaterThan.and(lessThan);
		System.out.println(intPredicate);
		assertThat(intPredicate).rejectsAll(newArrayList(2, 7));
	}

	@Test
	public void rejectsAllWithOr() {
		Predicate<String> startsWith = s -> s.startsWith("t");
		Predicate<String> endsWith = s -> s.endsWith("A");
		Predicate<String> predicate = startsWith.or(endsWith);
		System.out.println(predicate);
		assertThat(predicate).rejectsAll(newArrayList("AssertJ", "JUnit"));

		Predicate<Integer> greaterThan = i -> i < 3;
		Predicate<Integer> lessThan = i -> i > 6;
		Predicate<Integer> intPredicate = greaterThan.or(lessThan);
		System.out.println(intPredicate);
		assertThat(intPredicate).rejectsAll(newArrayList(4, 5));
	}

	@Test
	public void rejectsAllWithChaining() {
		Predicate<String> isNull = Objects::isNull;
		Predicate<String> startsWith = s -> s.startsWith("t");
		Predicate<String> contains = Pattern.compile("\\wX").asPredicate();
		Predicate<String> chaining = isNull.and(startsWith).or(contains);
		System.out.println(chaining);
		assertThat(chaining).rejectsAll(newArrayList("AssertJ", "JUnit"));

		Predicate<Integer> intIsNull = Objects::isNull;
		Predicate<Integer> greaterThan = i -> i < 3;
		Predicate<Integer> lessThan = i -> i > 6;
		Predicate<Integer> intChaining = intIsNull.and(greaterThan).or(lessThan);
		System.out.println(intChaining);
		assertThat(intChaining).rejectsAll(newArrayList(4, 5));
	}
}

心得分享

AssertJ Predicate Java Testing 除了提供流式判斷,還針對 Predicate 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 Java Testing AssertJ Predicate 將有助於驗證效率的提升。

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