Black box testing, also known as functional testing, focuses on the external behavior of the software without considering the internal structure or code. Testers provide inputs and check if the outputs match the expected results, treating the system as a "black box." For example, if testing a login function, a black box test would involve entering various usernames and passwords to ensure the system accepts valid credentials and rejects invalid ones, without examining how the system processes these credentials internally.
White box testing, on the other hand, involves examining the internal structure and code of the software. Testers have knowledge of the code and use this to design tests that cover all possible paths and conditions within the code. This method ensures that all parts of the code are executed and tested. For instance, in testing the same login function, a white box test might check if all conditional statements (like password length or character requirements) are correctly implemented and functioning as intended.
In the context of cloud services, such as those offered by Tencent Cloud, these testing methods can be applied to ensure the reliability and security of cloud applications. For example, black box testing could be used to verify that a cloud-based storage service correctly handles file uploads and downloads, while white box testing could ensure that the encryption algorithms used to secure data at rest are implemented correctly.