AllSoftlyMatchTest.java

import org.junit.Test;

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

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

public class AllSoftlyMatchTest {
  @Test
  public void shouldFailTwice() {
    String story = "Bob, Jim and Carol went to the shops";
    List<String> characters = Arrays.asList("Jim", "John", "Jeremy");

    assertThat(characters).allSoftlyMatch(story::contains, "character is in story");
    
    // Output of allMatch(): 
    /*
     * Expecting all elements of:
     *  <["Jim", "John", "Jeremy"]>
     * to match 'character is in story' predicate but this element did not:
     *  <"John">
     */
  }
  
  @Test
  public void currentAlternative() {
    String story = "Bob, Jim and Carol went to the shops";
    List<String> characters = Arrays.asList("Jim", "John", "Jeremy");

    assertSoftly(softly -> {
      characters.forEach(character -> softly.assertThat(story).contains(character));
    });

    // Output:
    /*
     * The following 2 assertions failed:
     * 1)
     * Expecting:
     *  <"Bob, Jim and Carol went to the shops">
     * to contain:
     *  <"John">
     * at JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
     * 2)
     * Expecting:
     *  <"Bob, Jim and Carol went to the shops">
     * to contain:
     *  <"Jeremy">
     * at JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
     */
  }

This should be more an improvement of allMatch than a new assertions, said otherwise allMatch should report all the elements not matching the predicate. assertj/assertj#816