Is the relationship between a test scenario and a test case always one to one?

The relationship between a test scenario and a test case is not always one to one, which makes the assertion that this relationship is always one to one incorrect. A test scenario represents a high-level concept or situation that needs to be tested, while a test case provides detailed steps and conditions for executing that test.

Multiple test cases can be created from a single test scenario to cover different aspects or flows within that scenario. For instance, a single login feature (test scenario) may require test cases that validate successful login, failed login due to incorrect password, login with special characters, and a scenario where a user account is locked. Each of these test cases provides specific details on how to test a unique aspect of the scenario.

Conversely, a single test case could also correspond to multiple test scenarios if it checks for a common functionality that applies across different scenarios. Thus, the relationship between test scenarios and test cases is inherently multifaceted and can vary based on the complexity and requirements of the application being tested. This understandability is crucial for adequate test coverage and quality assurance in software development.