Why can't we mock a final class?

Question

I am new to Java and haven't done much of unit testing in general.
Can someone tell me why final classes cannot be mocked?

score 5 · Answer 1 · edited May 23 '17 at 12:13

5

Most common mocking framework in the java world cannot mock final classes/methods because they are typically based on creating proxies. Creating proxies for final classes is not possible as we cannot subclass (extends) a final class.

However, there are some workarounds and solutions, many of which can be found here.

edited May 23 '17 at 12:13

Community

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answered May 05 '16 at 07:39

Idos

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score 2 · Answer 2 · answered May 05 '16 at 11:11

2

JMockit is able to mock final classes, methods, static and private fields, because it is primarily based on java.lang.instrument package classes and on proxy objects creation.

answered May 05 '16 at 11:11

Andrei_N

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Why can't we mock a final class?

2 Answers2