Answer: The three types of testing in the computing field are unit testing, integration testing and system testing .The following testing are mentioned in working order of as follows:-
Unit testing -It is the testing that is used for the evaluation of the task performed by small unit code of the software system.It has the main focus on the function testing of the codes individually.
Integration testing:- It checks the modules that are combined togather are working in the required manner or not. It can evaluate almost whole system through it's testing . Top-down integration and bottom-up integration are the two methods for integration testing.
System Testing:- system testing is the evaluation that covers the complete system by functional and non-functional test.The parameters tested in this testing are usability, reliability, scalability,security etc.
There are four (4) main types of testing and the order in which they are performed is the following:
1) Unit Testing
2) Integration Testing
3) System Testing
4) Acceptance Testing
<em>Unit testing</em> is usually made by software developers individually. Modular codes are used so it implies they will be more reliable easier to be reused. <em>Integration testing</em> implies combining the results of the testing in unit testing. The goal of this testing is to measure how well the system works by interacting with others. <em>System testing</em> comes third after evaluating all the units as only one- At this level, the system is evaluated to find out if it meets the requirements established. Finally, <em>acceptance testing</em> takes place before the software will be sent to the final users.
Based on the sampling methods provided in regards to the question it can be said that the method being used is called Simple Random. This refers to dividing the population into different group which are then chosen at random, giving each group an equal chance of getting chosen. Which is exactly what is going on in this scenario, as the day is divided into three parts and her mood is measured randomly during each part of the day.