A test case is a set of conditions for evaluating a particular feature of a software product to determine its compliance with the business requirements.
Whereas, a test scenario is generally a one line statement describing a feature of application to be tested. It is used for end to end testing of a feature and is generally derived from the use cases.
Let's now see the difference between the two -
|#||Test Case||Test Scenario|
|1.||A test case contains clearly defined test steps for testing a feature of an application.||A test scenario contains a high level documentation, describing an end to end functionality to be tested.|
|2.||Test cases focus on "what to test" and "how to test".||Test scenarios just focus on "what to test".|
|3.||Test cases have clearly defined step, pre-requisites, expected results etc. Hence, there is no ambiguity.||Test scenarios are generally one-liner. Hence, there is always possibility of ambiguity during testing.|
|4.||Test cases can be derived from test scenarios and have many to one relationship with them.||Test scenarios are derived from use cases.|
|5.||Test cases are efficient in exhaustive testing of application.||Test scenarios are beneficial in quick testing of end to end functionality of the application.||6.||More resources are required for documentation and execution of test cases.||Relatively less time and resources are required for creating and testing using scenarios.|