Why aren't my `assertEquals` statements all displaying something?-CodePudding

The following is a snippet from my JUnit5 test class.

@Test
@DisplayName("This is just a simple JUnit 5 test")
void testSimple() {
    assertEquals(2, 3, "this is the 1st assertEquals");
    assertEquals(4, 5, "this is the 2nd assertEquals");
    assertEquals(5, 6, "this is the 3rd asswerEquals");
}

However, when I run this, I only manage to get the first assert statement to show the message. As all of them clearly fail, shouldn't they all be showing their respective messages?

CodePudding user response：

As highlighted in the comments section above, an exception is thrown if assertEquals fails. This prevents any following statements from being reached.

CodePudding user response：

You can use assertAll to assert all tests together:

Assertions.assertAll(
            "heading",
            () -> assertEquals(2, 3, "this is the 1st assertEquals"),
            () -> assertEquals(4, 5, "this is the 2nd assertEquals"),
            () -> assertEquals(5, 6, "this is the 3rd assertEquals")
    );

CodePudding user response：

Normally, JUnit will not continue the test after the first failing assertion was encountered. There are a few reasons for this, the most important (IMHO) are:

If one assertion fails, it's likely for the subsequent ones to fail as well. Anyway, the whole test will be considered as failing.
Possible (but not mandatorily), your fist assertions can set up things for the following ones and/or check their prerequisites.

If you need to continue your tests even after a failed assiertion, see here for an answer showing how to achieve this. Anyway, the following other tests (new @Test annotated methods) will continue to be executed anyway.

Edit:

Highlighted test vs. assertion difference.