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Boundary
Value Analysis

Boundary Value Analysis uses a model of the
component that partitions the input and output values of the component into a
number of ordered sets with identifiable boundaries. These input and output values are derived
from the specification of the component's behaviour.
The model shall comprise bounded partitions of ordered input and
output values. Each partition shall
contain a set or range of values, chosen such that all the values can
reasonably be expected to be treated by the component in the same way (i.e.
they may be considered 'equivalent').
Both valid and invalid values are partitioned in this way. A partition's boundaries are normally defined
by the values of the boundaries between partitions, however where partitions
are disjoint the minimum and maximum values in the range which makes up the
partition are used. The boundaries of
both valid and invalid partitions are considered.

Test cases shall be designed to exercise
values both on and next to the boundaries of the partitions. For each identified boundary three test cases
shall be produced corresponding to values on the boundary and an incremental
distance either side of it. This
incremental distance is defined as the smallest significant value for the data
type under consideration. A test case
shall comprise the following:

- the input(s) to the
component:

- the partition boundaries
exercised- the expected outcome of the test case.

Test cases are designed to exercise valid boundary values, and
invalid input boundary values. Test
cases may also be designed to test that invalid output boundary values cannot
be induced.

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