### Question:
FluentWebElementAssert extends AbstractFluentAssert<FluentWebElementAssert, FluentWebElement> implements ElementStateAssert, ElementAttributeAssert { @Override public FluentWebElementAssert hasId(String idToFind) { String actualId = actual.id(); if (!actualId.equals(idToFind)) { failWithMessage("The element does not have the id: " + idToFind + ". Actual id found : " + actualId); } return this; } FluentWebElementAssert(FluentWebElement actual); @Override FluentWebElementAssert isEnabled(); @Override FluentWebElementAssert isNotEnabled(); @Override FluentWebElementAssert isDisplayed(); @Override FluentWebElementAssert isNotDisplayed(); @Override FluentWebElementAssert isSelected(); @Override FluentWebElementAssert isNotSelected(); @Override FluentWebElementAssert isClickable(); @Override FluentWebElementAssert isNotClickable(); @Override FluentWebElementAssert isPresent(); @Override FluentWebElementAssert isNotPresent(); @Override FluentWebElementAssert hasText(String textToFind); @Override FluentWebElementAssert hasTextContaining(String text); @Override FluentWebElementAssert hasTextMatching(String regexToBeMatched); @Override FluentWebElementAssert hasNotText(String textToFind); @Override FluentWebElementAssert hasNotTextContaining(String textToFind); @Override FluentWebElementAssert hasId(String idToFind); @Override FluentWebElementAssert hasClass(String classToFind); @Override FluentWebElementAssert hasNotClass(String htmlClass); @Override FluentWebElementAssert hasClasses(String... classesToFind); @Override FluentWebElementAssert hasNotClasses(String... classesToFind); @Override FluentWebElementAssert hasValue(String value); @Override FluentWebElementAssert hasName(String name); @Override FluentWebElementAssert hasTagName(String tagName); @Override FluentWebElementAssert hasDimension(Dimension dimension); @Override FluentWebElementAssert hasAttributeValue(String attribute, String value); @Override AbstractStringAssert hasAttribute(String attribute); @Override FluentWebElementAssert hasNotAttribute(String attribute);  }### Answer:
@Test public void testHasIdOk() { when(element.id()).thenReturn("some id"); elementAssert.hasId("some id"); }
@Test public void testHasIdKo() { when(element.id()).thenReturn("other id"); assertThatAssertionErrorIsThrownBy(() -> elementAssert.hasId("some id")) .hasMessage("The element does not have the id: some id. Actual id found : other id"); }