Perform Unit Tests
Note: implementation and modification of components takes place in the
context of configuration management on the project. Implementers are provided
with a private development workspace (see Activity:
Create Development Workspace) in which they do their work, as directed by Artifact:
Work Orders. In this workspace, source elements are created and placed under
configuration management, or modified through the usual check out, edit, build,
unit test, and check in cycle (see Activity: Make Changes).
Following the completion of some set of components (as defined by one or more
Work Orders and required for an upcoming build), the implementer will deliver
(see Activity: Deliver Changes) the associated new
and modified components to the subsystem integration workspace, for integration
with the work of other implementers.
Unit means not only a class in an object-oriented language,
but also free subprograms, such as functions in C++.
For testing each unit (implemented class), perform the following steps:
- To execute the test procedures, or test scripts if testing is
To execute unit test, the following steps should be followed:
- Set up the test environment to ensure that all the needed elements, such
as hardware, software, tools, data, and so on, have been implemented and are in the
- Initialize the test environment to ensure all components are in the
correct initial state for the start of testing.
- Execute the test procedures.
Note: Executing the test procedures will vary depending on whether
testing is automated or manual, and whether test components are needed as either drivers or stubs.
- Automated testing: The test scripts created during the
Implement Test step are executed.
- Manual execution: The structured test procedures
developed during the Structure Test Procedure activity are used to
manually execute the test.
- To determine whether the tests completed successfully and as desired.
- To determine if corrective action is required.
The execution of testing ends or terminates in one of two conditions:
- Normal: all test procedures (or scripts) execute as intended.
If testing terminates normally, then continue with the step
Verify Test Results.
- Abnormal or premature: the test procedures, or scripts, did not execute
completely or as intended. When testing ends abnormally, the test results
may be unreliable. The cause of termination must be identified,
corrected, and the tests re-executed before additional test activities are
If testing terminates abnormally, continue with the step Recover
from Halted Tests.
- To determine if the test results are reliable.
- To identify appropriate corrective action if the test results indicate
flaws in the test effort or artifacts.
When testing is complete, review the test results to ensure the test results
are reliable and reported failures, warnings, or unexpected results were not
caused by external influences (to the target-of-test), such as improper setup
If the reported failures are due to errors identified in the test artifacts
or due to problems with the test environment, take the appropriate corrective
action to recover from halted tests
and then execute the testing again.
If the test results indicate the failures are genuinely due to the target-of-test,
then this activity is essentially complete and typically either the Activity:
Submit Change Request or Activity: Fix a Defect
should now be performed.
- To determine the appropriate corrective action to recover from a
- To correct the problem, recover, and execute the tests again.
There are two major types of halted tests:
- Fatal errorsthe system fails; for example, network failures, hardware crashes,
and the like.
- Test Script Command Failuresspecific to automated testing, this is when
a test script cannot execute a command or a line of
Both types of abnormal termination to testing may exhibit the same symptoms:
- Unexpected actions, windows, or events occur while the test script is
- Test environment appears unresponsive or in an undesirable state, such as
hung or crashed.
To recover from halted tests, perform these steps:
- Determine the actual cause of the problem.
- Correct the problem.
- Set up the test environment again.
- Initialize the test environment again.
- Execute the tests again.