assert exception code example
Example 1: junit 5 assert exception message
Throwable exceptionThatWasThrown = assertThrows(NullPointerException.class, () -> {
codeThatThrows;
});
assertThat(exceptionThatWasThrown.getMessage(), equalTo("Message I expected to be thrown"));
Example 2: how to assert that an exception is thrown java
@Test
public void whenExceptionThrown_thenAssertionSucceeds() {
Exception exception = assertThrows(NumberFormatException.class, () -> {
Integer.parseInt("1a");
});
String expectedMessage = "For input string";
String actualMessage = exception.getMessage();
assertTrue(actualMessage.contains(expectedMessage));
}
Example 3: expected exception junit
@Test(expected = SomeException.class)
public void testName() {
}