Can AssertJ filter elements for assertion? #3107

1506085843 · 2023-03-24T09:19:26Z

1506085843
Mar 24, 2023

`
public class Student {
public String name;

    public Student(String name) { this.name = name; }

    public String getName() {return name;}

    public void setName(String name) { this.name = name; }
}

@Test
public void listFilterAssertThat() {
    List<Student> stuList = new ArrayList<>();
    stuList.add(new Student("Jerry" ));
    stuList.add(new Student("Tom"));
    stuList.add(new Student("Lucy"));

    //I want to check if the number of Tom is 1，but expected size: 1 but was: 3 in
    assertThat(stuList)
            .extracting(Student::getName)
            .asList()
            .contains("Tom")
            .hasSize(1);
}

`

It's not working properly.Expected size: 1 but was: 3 in. I want to check if the number of Tom is 1 . I was wondering if there is a way to filter List elements and assert,like below：
assertEquals(1, stuList.stream() .filter(v -> "Tom".equals(v.getName())) .count() );