TBrun Introduction
16 User Guide ©2019 LDRA Ltd.
LDRA TBrun
®
Ver. 64 903TBED1222119
In simple terms, Black Box Analysis concerns testing of code based on its externally perceived
interface. The tester need not know any of the fine details of the structure of the code. This is the
default mode for TBrun, where only the interface to the unit and its outputs are tested.
White Box Analysis concerns itself with detailed structural analysis of the code under test by utilising
Coverage Analysis to measure the effectiveness of the test data in exercising the unit under test.
TBrun also facilitates grey box testing which undertakes analysis on a copy of the source code that
has been configured to allow units of code to be tested in complete isolation. Light grey box mode
features this configuration plus standard LDRA Testbed instrumentation for code coverage
measurements to be taken. Dark grey box mode is similar, but does not contain the coverage
instrumentation.
Test Sequencer
TBrun creates the framework of a test case, in which the user specifies values for the inputs to the
unit under test. Users can also specify output values taken from design documents for specification
or requirements checking if they wish. TBrun even has the flexibility to allow only some of the output
variables to be user specified.
The inputs, and any specified outputs, are then utilised when generating a sequencer program which
contains a driver around the unit under test.
The sequencer program is compiled and executed in either White or Black Box mode and the outputs
from the unit under test are presented. The user can then accept these outputs into the internal
database. Acceptance of these outputs means that the Test Case is correct, the outputs of the unit
analysed are correct and they are to be stored for regression testing with the regression harness.
When outputs are also specified by the user, the tool presents both the user and TBrun generated
outputs. Users can then see if the specified outputs from the design match those produced by TBrun
exercising the unit under test and can accept any combination for storing in the internal database.
Regression Harness
The regression harness contains all the test cases associated with a particular sequence, in an
automatically generated program - “the harness”. The harness executes each test in turn and checks
that the output parameters and globals have the correct repeated values. This regression test can
demonstrate that the code still has the same functionality or meets the functionality as specified in
the design documents.
Unit Inputs and Outputs
TBrun is concerned with the testing of source code units with regard to their input and output
interfaces, as specified either from the code, or requirements and specification documents. Code
coverage measurements for these interfaces, and the unit’s body can also be taken.
TBrun enables users to specify values for the unit’s input interface to the unit under test. The unit
input interface will contain some or all of the following elements:
1. Global variables
2. Procedure parameters
TBrun can either accept values for the unit’s output interface from the user, or the tool will
automatically specify their values from the unit itself. The unit output interface will contain some or
all of the following elements
1. Return value
2. Global variables
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