Software Bug
A software bug is an error, flaw, failure or fault in a computer program or system that causes it to produce an incorrect or unexpected result, or to behave in unintended ways.
Bugs are unexpected behaviour in a Software System that deviates from requirements:
- Debugging identifying the root cause of the bug.
Software Testing
Testing: checking software system for known bugs:
- User Acceptance reduce risk of failing User Acceptance Test done by Customer.
Software Testing can be used to show the presence of bugs but never to show their absence.
Black Box & White Box Testing
Types of Software Testing:
- Black Box testing done without knowledge of code implementation (requirements only).
- White Box testing done with knowledge of code implementation (code + requirements).
| Testing | Test Complexity | Test Thoroughness | Test Coverage |
|---|---|---|---|
| Black Box | Lower | Lower | No |
| White Box | Higher | Higher | Yes |
Unit, Integration, System, Acceptance Testing
- Unit Test Test a single unit of software (eg. function) in isolation.
- Integration Test Test interoperability of multiple components
- System Test Test functionality of system as a whole.
- Acceptance Test Testing done by customer to verify quality of software delivered.
Test Case
Components of a Test Case are derived from verifiable Requirements
| Component | Description |
|---|---|
| Name | Name of the test case |
| Path | Location of the test case |
| Input | Test input |
| Oracle | Expected test output |
| Log | Actual test output |
Order of Testing
Order of running Test Cases:
- Cascading test cases must be run in order as they depend on prior test cases.
- Independent test cases can be run in any order.
| Order of Testing | Test Complexity | Parallel Execution |
|---|---|---|
| Cascading | Lower | No |
| Independent | Higher | Yes |