The differences between Functional Testing and Non-Functional Testing are listed below.
| Criteria | Functional Testing | Non-Functional Testing |
|---|---|---|
| Definition | Functional Testing is a type of software testing (or a group of software testing types) whereby the system is tested against the functional requirements/ specifications. | Non-Functional Testing is a group of software testing types whereby the system is tested against the non-functional requirements like usability, performance, security and compliance. |
| Basis | It is based on client’s requirements. For example, a client might require that a financial report be generated. | It is based on client’s expectations. For example, the client may expect that the financial report be generated within five seconds. |
| Intent | It tests WHAT the software does. | It tests HOW the software does. |
| Muscle | Test execution is normally manual. | It is normally automated. (Exception is Usability Testing which must be done manually.) |
| Levels | Functional Testing is conducted during all levels of Testing: Unit, Integration, System and Acceptance. | Non-Functional Testing is normally conducted during System and Acceptance Testing levels. |
| Method | Normally, Black Box Testing method is used. | Normally, White Box Testing method is used. (Exception is Usability Testing where black box testing method is used.) |
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Last Updated on September 7, 2020 by STF