unit tests tell developers that the
code is doing the right thing; functional tests tell developers that the code
is doing the right thing.
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unit tests:
unit tests written from the perspective
of a programmer. They ensure that the particular method of a class successfully
conducted a series of specific tasks. Each test confirms that the method of
generating the expected output when given input is known.
Write a suite maintained, automated
unit tests without a testing framework is virtually impossible. Before you
begin, choose the one team you agree on. You will use it constantly, so you
better like it. There are some unit-testing frameworks available from the
Extreme Programming Web site. I am most familiar with is JUnit for testing Java
code.
functional tests:
functional tests written from the
perspective of the user. These tests confirm that the system does what the user
expects to.
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Many times the system development is
equated with the construction of houses. While the analogy is not quite right,
we can extend for the purpose of understanding the difference between unit and
functional tests. Unit testing is analogous to building inspectors visited the
construction site of this house. He focused on the internal system house,
grounds, framing, electrical, plumbing, and so on. He ensures (tests) that
parts of the house will work correctly and safely, ie, meet the building code.
functional tests in this scenario is analogous to the homeowner visited the
construction site of the same. He assumes that the internal systems will behave
appropriately, that the building inspector is doing its job. homeowners focused
on what it would be like living in this house. He is concerned with how the
house looks, is the different rooms a comfortable size, not the house in
accordance with the needs of the family, is a window in a good spot to catch
the morning sun. homeowners perform functional tests at home. He has the
perspective of the user. The building inspector is doing unit tests at home. He
has a builder's perspective.
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As a unit test, write a suite
maintained, automated functional tests without a testing framework is virtually
impossible. JUnit is very good in unit testing; However, it is unpacked when
trying to write functional tests. There is no equivalent to JUnit for
functional testing. There are products available for this purpose, but I've
never seen these products are used in a production environment. If you can not
find a testing framework that meets your needs, you have to build one.
No matter how smart we build our
projects to work on, no matter how flexible system that we build, if what we
produce is not usable, we have wasted our time. As a result, functional testing
is the most important part of the development.
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