7.6 Test data

- Test data refers to input values used to evaluate and assess the functionality and performance of a computer program or system.
- It helps identify errors and assess how the program handles different scenarios

## Normal Data

- Normal data is the test data which accepts values in acceptible range of values of the program
- Normal data should be used to work through the solution to find the actual result(s) and see if they are the same as the expected result(s)
- e.g. in a program where only whole number values ranging from 0 to 100 (inclusive) are accepted, normal test data will be : 23, 54, 64 , 2 and 100

## Abnormal Data

- Test data that would be rejected by the solution as not suitable, if the solution is working properly is called abnormal test data / erroneous test data.
- e.g. in a program where only whole number values ranging from 0 to 100 (inclusive) are accepted, abnormal data will be: -1, 151, 200, 67.2, “Sixty-Two” and -520

## Extreme Data

- Extreme data are the largest and smallest values that normal data can take
- e.g. in a program where only whole number values ranging from 0 to 100 (inclusive) are accepted, extreme data will be: 0 and 100

## Boundary Data

- This is used to establish where the largest and smallest values occur
- At each boundary two values are required: one value is accepted and the other value is rejected.
- e.g. in a program where only whole number values ranging from 0 to 100 (inclusive) are accepted, one example of boundary data will be: 100 and 101. 100 will be accepted and 101 will not be accepted