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From "Jason Man, CLSA" <jason....@clsa.com>
Subject Adopting mock framework (ex. Mockito) for unit tests
Date Tue, 16 Jan 2018 10:13:24 GMT
Hi Igniters,

I'd like to discuss the topic of adopting a mock framework such as Mockito into Ignite's project
for writing unit tests.

Here's a simple article that illustrate why using a mock object for testing is necessary,
and why using a framework is better than doing it yourself:

Here's Mokito's website which also illustrate the Why and How:

Then, here's my PR for one of the bug fixes I'm trying to fix in Ignite that prompted me to
use mocks:

In the case of my unit test, not using a mocking framework will be difficult to test certain
negative behaviour of Cassandra.  On the other hand, manually mocking the objects (instead
of using a framework) will result in hundreds of lines of boiler plate code.  Or in some cases,
it's ugly to mock an object where it has a package-private constructor instead of a public
one. (you'd have to put your mock object in the same package...)

Overall, I think introducing a mocking framework can help us write unit tests that have better
coverage of code, especially mocking behaviour of external dependencies (such as Cassandra).

What do you guys think?


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