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Unit test can be done within a single module Cohesion of a single module/component is the degree

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Q: Why is a highly coupled module difficult to unit-test?
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Why is highly coupled module difficult to unit test?

Unit test can be done within a single module Cohesion of a single module/component is the degree to which its responsibilities form a meaningful unit; higher cohesion is better. Someone had vague reference to decomposability here. Clarification? How about: 'Cohesion is inversely proportional to the number of responsibilities a module/component has.' Coupling between modules/components is their degree of mutual interdependence; lower coupling is better. size: number of connections between routines intimacy: the directness of the connection between routines visibility: the prominence of the connection between routines flexibility: the ease of changing the connections between routines A first-order principle of software architecture is to increase cohesion and reduce coupling. so having coupling in program is not correct reduce coupling in your program it will favour Unit testing......


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Coupling is an important metric. If the module P. is tightly coupled to module Q. then a change to module P. may require a corresponding change to module Q. If this change is made, as required, during integration or postdelivery maintenance, then the resulting product functions correctly; however, progress at that stage is slower then would have been the case had coupling been looser. It has been shown that the stronger (more undesirable) The coupling, the greater the fault proneness. In other words, it is easy to believe that strong coupling can have a deleterious effect on maintainability.


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