DbC (design by contract) and unit tests

Question

I use contracts with C # 4.0 and before I used a lot of unit tests (not with TDD). I am wondering if DbC removes the need to write external unit tests?

Personally, I find contracts better for creating reliable frameworks, because contracts are closely related to the code itself and offer other benefits.

What do you guys think?

Answer 1

See also:

Design by contract and test development

Contract Design and Test-Based Development

Answer 2

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Answer 3

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Using DbC will be effective for things like checking I / O methods, and this can save you some time.
But for more complex tests (for example, dependency on mocking) this will be easier with external unit tests .

Therefore, I do not think that you can eliminate all the requirements for testing an external block using them.