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    <p>Great question. Basically, stubs disconnect a test suite from an environment and service virtualization emulates an environment in order to better exercise the true intent of a test. </p> <p>In more detail...</p> <p>Stubs provide replacement implementations for objects, methods, or functions in order to remove external dependencies. Stubs are typically used during unit and component testing for two main purposes: 1) To isolate the code under test from the integrated environment 2) To enable testing to proceed when it is not possible to access an external resource or problematic method/function/object.</p> <p>If you're trying to write a unit test and need to replace a simple call to a database, external libraries (e.g., file I/O) or other system API, stubbing might be perfectly suited for your needs. </p> <p>While stubs/mocks are typically used to “skip” unavailable system components, service virtualization allows team members to emulate environments (or specific components) and make their behavior available to the entire team. For instance, service virtualization might be used to emulate the behavior of a dependent component (such as a 3rd-party service, database, mainframe, packaged application, etc.) that is evolving, not yet available, or difficult to access / configure for testing.</p> <p>Service virtualization can represent much more realistic behavior than simple stubs and mocks. If you can access the dependent application, you can capture its current behavior in a "virtual asset" by recording from the live system. Alternatively, you can model virtual assets that represent the anticipated behavior. You can then configure this virtual asset by parameterizing its conditional behavior, performance criteria, and test data. Moreover, you can easily modify the virtual asset to produce the appropriate assortment of fault conditions, exceptions, etc. that should be exercised in order to validate the full range of system behavior. </p> <p>Parasoft, the company I work for, addresses both of these use cases. Our Development Testing platform facilitates stub generation and management for unit testing, and our Jolt-award winning Parasoft Virtualize product offers service virtualization. See <a href="http://www.parasoft.com/service-virtualization" rel="nofollow">http://www.parasoft.com/service-virtualization</a> and <a href="http://www.parasoft.com/development-testing" rel="nofollow">http://www.parasoft.com/development-testing</a> for details. </p>
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    1. POStubs / Mocks vs. Service Virtualization..? Yikes
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    1. COThanks for your response, I'll be sure to take a look. Could you please elaborate on your point that SV can represent more realistic behaviour? Do you mean to say that it can _more easily_ represent it? The auto-capture element sounds **great** from a development point of view, but surely the functionality of a stub ultimately depends entirely on the effort spent coding it. Also, what platform / technologies does SV software typically use to communicate its emulated functionality, i.e. by what mechanism does a codebase connect with the the VS? Thanks in advance!
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      1. USTom Tom
 

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