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問題 #165
You are responsible for the non-functional testing of a website supporting a popular restaurant chain. Due to the rapid expansion of the number of restaurants in the chain, the company is expecting the peak number of concurrent website views to more than triple in the next 6 months. As a result, it has purchased two further production servers to support the existing one. A new hardware release has been scheduled for which the following product risk has been recorded:
(Insert Table 2)
Which one of the following non-functional test typos would be BEST to mitigate this risk?
答案：B
解題說明：
In this scenario, the risk is related to the anticipated increase in concurrent website views and whether the additional servers will be sufficient to handle the increased load. This situation requires a specific type of non-functional testing to ensure that the system can effectively scale with the increased demand.
Analysis of Options:
* Load Testing:
* Load testing involves simulating a specified number of users to see how the system performs under expected loads. While this is useful, it is not the best fit for this scenario where the primary concern is future scaling capacity.
* Adaptability Testing:
* Adaptability testing assesses how well the system adapts to different environments or conditions.
This is not directly related to the risk of handling increased concurrent users and is therefore not the best choice.
* Scalability Testing (Option C):
* Scalability testing specifically evaluates how well the system can scale up or down in response to an increase in load. This type of testing is designed to verify that the system can handle growth in users and data volume effectively, making it the best choice to mitigate the risk described.
* Reliability Testing:
* Reliability testing focuses on the system's ability to function correctly over time under certain conditions. While reliability is important, it does not directly address the issue of handling increased concurrent usage.
Mitigating the Risk:
Given the risk of the servers potentially not being adequate to handle the increased concurrent website views, scalability testing is the most appropriate type of non-functional testing. It will help determine if the two additional servers, along with the existing one, can support the anticipated growth in user traffic without performance degradation.
References:
The ISTQB CTAL-TTA syllabus and standard non-functional testing practices emphasize the importance of scalability testing when assessing the ability of a system to handle increased load and user concurrency.
Sources:
* ISTQB-CTAL-TTA Syllabus
* General knowledge on non-functional testing types and their applications.
問題 #166
Given the following code:
If x > y and z = 3 statement!
elself z = 4
statement2
endif;
What is the minimum number of tests needed to achieve 100% statement coverage?
答案：A
解題說明：
To achieve 100% statement coverage, you need to ensure every executable statement in the code is executed at least once during testing. Given the code:
If x > y and z = 3 statement1 elseif z = 4 statement2 endif;
Two tests are required:
* Test 1: Set x > y and z = 3 to execute statement1.
* Test 2: Set z = 4 (irrespective of the condition x > y) to execute statement2.
With these two tests, both conditions that lead to the execution of statement1 and statement2 are covered.
問題 #167
You are testing software that will be used in nuclear power plants. The particular piece of code you are testing has been classified as SIL 2. The following section of code falls under this classification:
If ((A > B) or (C > D)) and (E = F) then print A
Endif
Which of the following sets of test data would supply the minimum tests needed to achieve the "highly recommended" level of coverage?
答案：D
解題說明：
In software testing, especially within contexts like nuclear power plants, achieving a "highly recommended" level of coverage often requires strategic test case selection to verify all logical conditions are accurately assessed. For the condition "If ((A > B) or (C > D)) and (E = F) then print A", the critical tests involve evaluating the boolean logic.
* Test Case Analysis: Test Set 1 is selected because it should ideally include scenarios where:
* Both conditions (A > B) and (C > D) are true, and (E = F) is true to ensure the print statement executes.
* One of the conditions (A > B) or (C > D) is false while the other is true, combined with (E = F) being true, to test the OR logic.
* Both conditions (A > B) and (C > D) are false with (E = F) being true, which should not trigger the print statement, testing the AND logic.
* Condition where (E != F), irrespective of other conditions, to confirm that the print statement does not execute.
問題 #168
Consider the pseudo code provided below:
Which of the following options provides a set of test cases that achieves 100% decision coverage for this code fragment, with the minimum number of test cases?
Assume that in the options, each of the three numbers in parenthesis represent the inputs for a test case, where the first number represents variable "a", the second number represents variable "b", and the third number represents variable "c".
答案：A
解題說明：
To achieve 100% decision coverage with the minimum number of test cases, we need to ensure that every branch of the decision is taken at least once. For the code provided:
* The first condition (a>b) is true for the first two test cases and false for the third.
* The second condition (b>c) is true for the first test case, false for the second, and does not matter for the third since the first condition is false.
Therefore, with these three test cases, we cover all possible outcomes of the decision, ensuring 100% decision coverage.
問題 #169
Consider the following specification:
If you are flying with an economy ticket, there is a possibility that you may get upgraded to business class, especially if you hold a gold card in the airline's frequent flier program. If you don't hold a gold card, there is a possibility that you will get 'bumped' off the flight if it is full when you check in late.
This is shown in the control flow graph below. Note that each box (i.e., statement, decision) has been numbered.
Three tests have been run:
Test 1: Gold card holder who gets upgraded to business class
Test 2: Non-gold card holder who stays in economy
Test 3: A person who is bumped from the flight
What is the level of decision coverage achieved by these three tests?
答案：B
解題說明：
The control flow graph provided illustrates the decision points for an airline's upgrade and boarding process.
Decision coverage is a measure of the percentage of decision points executed during testing:
* Test 1 covers the decision points: Gold card? (Yes) and Business full? (No).
* Test 2 covers: Gold card? (No) and Economy full? (No).
* Test 3 covers the decision that leads to being bumped from the flight, which is Economy full? (Yes) and Business full? (Yes).
From the given tests, the decision points for Gold card? (No) and Business full? (No) are not tested, leaving us with 4 out of 6 decision points covered, which is approximately 67% decision coverage.
問題 #170
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