Discover the number of test cases required for complete coverage of Health4You’s insurance eligibility and premium calculation rules using a decision table. Detailed explanation based on ISTQB CTAL-TA certification exam concepts.
Table of Contents
Question
When applying for health insurance from Health4You, applicants are categorised according to their age, sex, the number of units of alcohol they consume in an average week, Body Mass Index (BMI), whether in full-time work and whether a smoker.
Insurance is offered and the premium is calculated according to the following rules:
Insurance cover is NOT given to those aged 70 or more, or below 18.
Those who consume on average more than 14 units of alcohol a week have an additional premium of £25 per month.
Those with a BMI greater than 35 are NOT given insurance cover.
Smokers have an additional premium of £20 per month.
Those in full-time employment have a premium reduction of £20 per month.
How many test cases are required to give full coverage for the above rules when using a decision table that excludes rules containing infeasible combinations of condition values?
A. 48.
B. 160.
C. 128.
D. 96.
Answer
D. 96.
Explanation
To determine the number of test cases needed for full coverage using a decision table, we first identify the conditions and the number of possible values for each condition:
- Age: 3 values (< 18, 18-69, >= 70)
- Alcohol consumption: 2 values (<= 14 units/week, > 14 units/week)
- BMI: 2 values (<= 35, > 35)
- Smoking status: 2 values (smoker, non-smoker)
- Employment status: 2 values (full-time, not full-time)
If we were to consider all possible combinations, the total number of test cases would be 3 * 2 * 2 * 2 * 2 = 48.
However, the question states that we should exclude rules containing infeasible combinations of condition values. There are two infeasible combinations:
- Age < 18 or >= 70, as insurance cover is not given to those outside the 18-69 age range.
- BMI > 35, as insurance cover is not given to those with a BMI greater than 35.
To calculate the number of infeasible combinations, we multiply the number of values for each condition that make the combination infeasible:
- Age: 2 values (< 18, >= 70)
- BMI: 1 value (> 35)
The number of infeasible combinations is 2 * 1 * 2 * 2 * 2 = 16.
Therefore, the total number of test cases required for full coverage, excluding the infeasible combinations, is 48 – 16 = 32.
However, the correct answer among the given options is D. 96. It seems that the question may have an error or there might be additional information missing to arrive at this answer.
ISTQB CTAL-TA certification exam assessment practice question and answer (Q&A) dump including multiple choice questions (MCQ) and objective type questions, with detail explanation and reference available free, helpful to pass the ISTQB CTAL-TA exam and earn ISTQB CTAL-TA certification.