Choosing Unit Test Cases - Guideline-Based Testing

Sequence testing guidelines, Whittaker's general guidelines, boundary values, path testing

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Views #: 190

Questions #: 10

Time: 8 minutes

Pass Score: 80.0%

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Sequence Testing Guideline - Single Value

1 pts

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One guideline for testing programs with sequences, arrays, or lists states: test the software with sequences that have only a single value. Why is this guideline important?

Single-value sequences are the only ones that reveal performance bottlenecks

Single-value sequences are the most common type encountered in production systems

Testing frameworks like JUnit require single-value test cases as a baseline

Programmers sometimes embed assumptions that sequences have multiple values, causing failures with single-value inputs

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Sequence Testing Guidelines

1 pts

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Which of the following are recommended guidelines for testing programs that process sequences, arrays, or lists? Select all that apply.

Only test sequences with an even number of elements to avoid rounding issues

Test with sequences that have only a single value

Use different sequences of different sizes in different tests

Test with an empty sequence if the specification allows it

Derive tests so that the first, middle, and last elements of the sequence are accessed

Test exclusively with the maximum allowed sequence length

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Why Different Sequence Sizes Matter

1 pts

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The guideline recommends using different sequences of different sizes in different tests. What is the primary reason for this?

Larger sequences always reveal more defects than smaller ones

Different sizes are required to satisfy code coverage metrics

Using the same size sequences would exceed memory limits in the test environment

Different sequence sizes decrease the chances that a defective program accidentally produces a correct output

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First, Middle, Last Element Testing

1 pts

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A tester is testing a method that finds the maximum value in an array. According to the 'first, middle, last' sequence testing guideline, which test inputs should be included?

Design tests where the maximum value appears at the first position, at a middle position, and at the last position

Only test with the maximum value at position 0 in the array

Test only with the array sorted in ascending order

Test exclusively with arrays where all elements are equal

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Whittaker's General Testing Guidelines

1 pts

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Whittaker's book provides general testing guidelines for choosing effective test cases. Which of the following are among his recommended guidelines? Select all that apply.

Repeat the same input or series of inputs numerous times

Choose inputs that force the system to generate all error messages

Only test with inputs that match the specification exactly

Force invalid outputs to be generated

Avoid testing error conditions since they rarely occur in production

Design inputs that cause input buffers to overflow

Force computation results to be too large or too small

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Buffer Overflow Testing

1 pts

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A tester deliberately sends 10,000 characters to a text input field that was designed to accept a maximum of 255 characters. Which Whittaker testing guideline does this test follow?

Force computation results to be too large or too small

Choose inputs that force the system to generate all error messages

Repeat the same input numerous times

Design inputs that cause input buffers to overflow

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Repeated Input Testing

1 pts

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A tester repeatedly submits the same login request 500 times in quick succession to a web application. Which Whittaker guideline does this test apply?

Choose inputs that force the system to generate all error messages

Design inputs that cause input buffers to overflow

Repeat the same input or series of inputs numerous times

Force invalid outputs to be generated

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Path Testing Concept

1 pts

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Path testing is a testing strategy described as targeting every independent execution path through a component or program. Which of the following correctly describes what path testing achieves when every independent path is executed?

All external APIs and interfaces have been called at least once

All classes and objects have been instantiated at least once

All possible combinations of input values have been tested

All statements have been executed at least once and all conditional statements tested for both true and false cases

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Developing Personal Testing Guidelines

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The text notes that as a tester gains experience, they can develop their own guidelines about choosing effective test cases. What is the basis for these personal testing guidelines?

Experience from testing many programs and observing which types of test cases find defects

Formal mathematical proofs of program correctness

Random selection of test inputs from the specification

Automated test generation tools that apply machine learning

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Guideline-Based vs. Partition-Based Testing

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A development team is testing a sorting algorithm. They have already applied equivalence partitioning (testing empty arrays, single elements, already sorted arrays, and large random arrays). Their team lead suggests also testing with arrays that have all identical elements and arrays in reverse-sorted order. What testing approach does the team lead's suggestion represent?

Release testing - because a complete system is being verified

Partition testing - because new partitions are being defined

White-box testing - because the code structure is being analyzed

Guideline-based testing - applying experience-based knowledge of common edge cases in sorting algorithms

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Undergraduate Professional

Sequence Testing Guideline - Single Value

Correct Answer

Explanation

Sequence Testing Guidelines

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Explanation

Why Different Sequence Sizes Matter

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First, Middle, Last Element Testing

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Explanation

Whittaker's General Testing Guidelines

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Buffer Overflow Testing

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Repeated Input Testing

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Path Testing Concept

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Developing Personal Testing Guidelines

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Guideline-Based vs. Partition-Based Testing

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