How to assert 'Exception B' when "Exception A: Exception B" is thrown?

Question

I want to assert that a certain exception (SSLHandshakeException) is thrown when running some code.

assertThatThrownBy(() -> {
        // some code
    }).isInstanceOf(SSLHandshakeException.class);

However, this fails because the failure trace says:

java.lang.AssertionError: 
Expecting:
  <javax.ws.rs.ProcessingException: javax.net.ssl.SSLHandshakeException:     Received fatal alert: handshake_failure>
to be an instance of:
  <javax.net.ssl.SSLHandshakeException>
but was:
  <"javax.ws.rs.ProcessingException: javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure

Checking on ProcessingException would work, but is too general. I need to make sure that the code snippet fails because of SSL handshake.

How can I change it in a way that the "second" exception should be considered?

score 2 · Accepted Answer · answered May 08 '19 at 21:33

2

You can simply use hasCauseInstanceOf.

answered May 08 '19 at 21:33

Joel Costigliola

6,308
27
35

.hasCauseInstanceOf(SSLHandshakeException.class); worked for me. Thanks – Patze May 09 '19 at 08:23

score 1 · Answer 2 · answered May 08 '19 at 15:20

1

A getCause() should help here to access the inner exception.

assertThatThrownBy(() -> {
        // some code
    }).getCause().isInstanceOf(SSLHandshakeException.class);

answered May 08 '19 at 15:20

Thomas Weller

55,411
20
125
222

I don't have that getCause method, suggest using hasCauseInstanceOf – nicoabie Dec 17 '20 at 19:24

How to assert 'Exception B' when "Exception A: Exception B" is thrown?

2 Answers2