A compare of CA Service Virtualization versus the practice of Mocking and Stubbing.

1. CA Service Virtualization vs. Mocks/Stubs
Compare key areas of differentiation between mocking / stubbing tools
and CA Service Virtualization

2. Definitions
Setting the ground

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Stubs Mocks
 “Provide canned answers to
calls made during the test,
usually not responding at all
to anything outside what’s
programmed in for the
test.”
 Development or Testing
“objects pre-programed
with expectations which
form a specification of calls
they are expected to
receive.”
http://martinfowler.com/articles/mocksArentStubs.html#TheDifferenceBetweenMocksAndStubs

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Service Virtualization
 A method of capturing and
simulating the behavior of
unavailable or incomplete
systems.
 Takes a modern approach to the
practice of “mocking” or
“stubbing”.
 Uses sufficiently “real” virtual
services without depending on
complexity and constraints of real
hardware or software.
 Benefits include:
– Earlier detection of defects
– Shorter Release cycles
– Reduced cost of development
– Reduced physical infrastructure
dependencies

5. Capabilities & Benefits - Compare & Contrast
Service Virtualization vs. Mocks/Stubs

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Reduce Dependencies
and Constraints in App
Development
Reduce cycle times, earlier defect
discovery, more efficient use of resources.
Service Virtualization Mocks/Stubs

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Virtualize test data for
comprehensive test paths
Faster setup/teardown, greater stability for
test automation.
Service Virtualization Mocks/Stubs
Test data must be
designed for specific use

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Enable high performance
environments
Better realism and quantity of performance
testing.
Service Virtualization Mocks/Stubs
Not designed for
performance testing

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Complete testing of
application business logic
Test each app component individually and
automate the validation of business
processes that span across multiple
internal and cloud based services.
Service Virtualization Mocks/Stubs
Inside Application
Code

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Provide reuse and
collaboration across
development teams
Virtualize a Service once and reuse across
development teams and applications.
Service Virtualization Mocks/Stubs
Every app requires writing
mocks that could be shared

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Incorporate into
Continuous Integration
Process
Hook into all stages of CI environments.
(Dev., QA, Performance, and Integration)
Service Virtualization Mocks/Stubs
Limited outside
of Dev. Environment

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Reduce time and cost of
Maintenance for Dev and
Test environments
Increase dev time to focus on application
code vs. maintaining mocks and test data
that are code dependent.
Service Virtualization Mocks/Stubs
Code Dependent

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Expansive Code Coverage
Enable a consistent and standardized SDLC/
CI Process with solution that supports all
code bases.
Service Virtualization Mocks/Stubs
Java Only

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UI to modify request/
response
Resources with no developer skills can
create and update models.
Service Virtualization Mocks/Stubs
Coding required

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Bulk import/ recording of
transactions
Leverage large volumes of actual behavior
and data.
Service Virtualization Mocks/Stubs
No recording or importing
of transactions

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Magic Strings/Dates
Test request that don’t have a “specific”
response, as patters are identified and
made available. .
Service Virtualization Mocks/Stubs
Static Information

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Think Time
Add “think time” to transactions to
simulate performance in production.
Service Virtualization Mocks/Stubs
Single Thread

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Various Capture Methods
capture services through record a live
system (for accuracy) or import data.
Service Virtualization Mocks/Stubs
No Capture Mode

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Learning Mode
“Learn” live system data over time or pass-
through to w/o reconfiguring SUT.
Service Virtualization Mocks/Stubs
No Learning Mode

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CA Service Virtualization
 Leverage throughout Continuous Integration (CI) process
– Development, Pre-Production, Performance, Integration, QA.
 Test Data Management challenges may disappear entirely.
– Edge conditions, negative test scenarios and error handling
– Virtual service never “burn” since they play back behavior responses.
 Support across the enterprise including:
– web traffic (HTTP), web services (SOAP/XML), integration layers & ESB
(JMS, etc.)
 Simulate transactions and connections with:
– underlying mainframes (CICS, CORBA, etc.,), databases (JDBC, etc.) and
third-party services.

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CA Service Virtualization
 STS security Plugin module cannot be mocked, but are easily
supported as a container with Service Virtualization
 Drive performance testing. Traditional Mock/Stub tools - not
designed for performance testing environments.
 Represents more realistic behavior than stubs and mocks.
 Delivers stand-alone, decoupled services suitable for sharing
between teams and organizations.
 Does not require proprietary source-code level changes or
modifications of the application under development.

22. For more information visit
ca.com/SV