Explanation
The business analyst should write test scripts that reflect real life and cover the requirements to help prevent gaps from being discovered after go live. Test scripts are step-by-step instructions on how to execute a test scenario on a specific user or level of access using expected inputs and outputs. Test scripts should reflect real life situations that users may encounter when using the solution in production, such as creating cases, updating records, generating reports, etc. Test scripts should also cover all the requirements that were defined for the project or enhancement, as well as any exceptions or variations that may occur. Writing test scripts that reflect real life and cover the requirements can help ensure that the solution works as intended and meets stakeholder needs.
References:https://trailhead.salesforce.com/content/learn/modules/user-acceptance-testing-video/create-test-scrip

Explanation
The type of requirement documentation that the business analyst is using in this scenario is process mapping.
Process mapping is a technique that involves creating a visual diagram of the steps or activities involved in completing a business process or workflow. Process mapping helps to document how users perform their daily work in Salesforce, what inputs and outputs they use or produce, what decisions they make, and what roles or systems they interact with. Process mapping also helps to identify any inefficiencies, bottlenecks, redundancies, or risks in the existing process, as well as opportunities for improvement or optimization.
References:https://trailhead.salesforce.com/content/learn/modules/salesforce-business-analyst-certification-prep/

The types of analyses that a business analyst typically performs during the discovery phase of a Salesforce project are enterprise analysis, strategy analysis, and stakeholder analysis. Enterprise analysis is a technique that examines and evaluates the internal and external factors that affect a business or organization. It can help the business analyst understand the strengths, weaknesses, opportunities, and threats (SWOT) of a business or organization. Strategy analysis is a technique that defines and clarifies the goals, objectives, scope, and success criteria of a project or initiative. It can help the business analyst align the project or initiative with the vision and mission of a business or organization. Stakeholder analysis is a technique that identifies and evaluates the people who have an interest in or influence on a project or initiative. It can help the business analyst understand who are the key stakeholders, what are their roles and responsibilities, what are their needs and expectations, how they communicate and collaborate, etc. Financial analysis is a technique that assesses the costs and benefits of a project or initiative. It can help the business analyst justify or prioritize the project or initiative based on its return on investment (ROI) or net present value (NPV). Technical analysis is a technique that examines and evaluates the technical aspects of a project or initiative. It can help the business analyst understand the feasibility or complexity of a project or initiative based on its architecture or design.
Operational analysis is a technique that analyzes and optimizes the processes and workflows of a business or organization. It can help the business analyst improve the efficiency or effectiveness of a business or organization based on its performance metrics or best practices.