Test Scenario:-

Its a high level definition and classification of the test requirement. In testing of any module's functionality it is grouped depending on same functionality.

It consist of following parameters:

• Use case ID
• scenario ID
• Test scenario description
• Number of test cases associated with it

Test Case:-

Test cases are the document or set of conditions(valid and invalid) under which tester ensure that it satisfies the requirements. A test case with valid functionality called positive test case and with invalid functionality called Negative functionality.

Test cases template consist following fields:

• Scenario ID
• Test case ID
• Test cases description
• Prerequisite
• Test steps
• Test Data
• Expected result
• Actual result
• Status
• Comment

Test Script:

Test script are nothing its a set of instruction  or a test case composed with test data. For a same test case there can be multiple test scripts with multiple set of test data. In manual testing it is also referred as Test case.

A test scripts can be a Manual test script and Automation test script

Automation test Script:-  Its a test steps written in scripting and programming language and executed with automation tool.