Choosing Unit Test Cases - Partition Testing

Two Strategies for Choosing Test Cases

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Strategy

Guideline-based testing

Partition testing

Description

Use testing guidelines based on previous experience of common errors to choose test cases

Identify groups of inputs that have common characteristics and should be processed in the same way, then choose tests from within each group

Two key strategies help choose effective unit test cases. Match each strategy to its correct description.

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What Makes a Good Test Case Set

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When designing unit test cases, two kinds of test cases should be created. Which of the following correctly describes both kinds? Select all that apply.

Test cases that only test the most critical methods identified by management

Test cases that test all combinations of all possible inputs exhaustively

Test cases that reflect normal operation of the program and show that the component works

Test cases that check abnormal inputs are properly processed without crashing

Test cases based on testing experience of common problems that use abnormal inputs

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Equivalence Partitions Concept

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The equivalence partitioning diagram below illustrates the concept.

What does each smaller unshaded ellipse within the large input ellipse represent?

An equivalence partition - a group of inputs that should be processed in the same way

A test case that has already been executed

A group of invalid inputs that should be rejected by the system

A subset of outputs that the system can produce

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Equivalence Partition Example - Integer Input

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A program specification states: the program accepts 4 to 8 inputs which are 5-digit integers greater than 10,000. Based on equivalence partitioning, identify the correct input partitions for the number of inputs.

Which set of input partitions correctly represents the number-of-inputs dimension for this specification?

Exactly 4, exactly 5, exactly 6, exactly 7, exactly 8

Less than 0, between 0 and 4, between 4 and 8, more than 8

Less than 4, between 4 and 10, more than 10

Less than 4, between 4 and 8, more than 8

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Equivalence Partitions for Integer Values

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Test Inputs

×50,000

×9,999

×10,000

×99,999

×100,000

Less than 10,000 (invalid)

Between 10,000 and 99,999 (valid)

More than 99,999 (invalid)

Continuing with the same specification (5-digit integers greater than 10,000), classify each test input into the correct partition for the value dimension.

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Boundary Value Selection Rule

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A good rule of thumb for selecting test cases from equivalence partitions is to choose values at the boundaries and near the midpoint. Why are boundary values particularly important?

Testing guidelines require at least three tests per partition boundary

Designers and programmers tend to overlook atypical boundary values, and program failures often occur there

Boundary values always produce the fastest execution path through the code

Boundary values are the easiest to compute and document automatically

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Black-Box vs. White-Box Testing

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Complete each description with the correct testing approach: "When you use the system (1) to identify equivalence partitions, this is called (2) testing. You don't need any knowledge of how the system works. It is sometimes useful to supplement this with (3) testing, where you look at the (4) to find other possible tests."

Please drag and drop the selected option in the right place or type it instead

code

black-box

specification

white-box

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Output Equivalence Partitions

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Which statement correctly describes output equivalence partitions?

Output partitions can only be defined after running all input partition tests

Output partitions are always identical to input partitions in a 1:1 mapping

Output partitions are groups of outputs that have something in common, and may require their own separate input partitions

Output partitions only apply to systems that produce numeric results

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Exception Partitions in White-Box Testing

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A developer examines the source code and finds that the program includes specific exception handlers for negative number inputs, zero inputs, and very large number inputs. How can this knowledge be used in test-case design?

This knowledge should be ignored because test cases must be based only on the specification

This knowledge means the program should be re-written to eliminate exception handling

This knowledge can be used to identify exception partitions - ranges where the same exception handling should be applied

This knowledge indicates that the exception handlers should be removed before testing

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Identifying Partitions from Specification

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A specification states: a method processes a list of student scores and returns a grade. Scores from 0 to 49 are Fail, 50 to 69 are Pass, 70 to 84 are Merit, and 85 to 100 are Distinction. Which set of equivalence partitions is most appropriate for testing this method?

Only three partitions: low, medium, and high scores

Only one partition: the range 0-100 since all are valid scores

Exactly 101 partitions, one for each possible integer score

Five partitions: below 0 (invalid), 0-49, 50-69, 70-84, 85-100, above 100 (invalid)

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Why Programs Behave Similarly Within a Partition

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Why is it valid to test just one or a few values from an equivalence partition rather than every possible value in the partition?

Because all values in a partition are mathematically identical

Because programs normally behave in a comparable way for all members of an equivalence partition

Because only boundary values actually execute different code paths

Because testing every value would violate software licensing restrictions

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Deriving Test Cases from Partitions

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For the specification accepting 4 to 8 inputs of 5-digit integers greater than 10,000, which set of test inputs best represents good partition testing practice, including boundary values?

Exactly 5 inputs of 50,000 repeated 3 times with identical values

3 inputs of 9,999 - 6 inputs of 50,000 - 9 inputs of 99,999

3 inputs of 9,999, 4 inputs of 10,000, 7 inputs of 50,000, 8 inputs of 99,999, 9 inputs of 100,000

Only: 6 inputs of value 50,000 (one test from the middle of both valid partitions)

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Two Strategies for Choosing Test Cases

Strategy

Description

Correct Answer

Explanation

What Makes a Good Test Case Set

Correct Answer

Explanation

Equivalence Partitions Concept

Correct Answer

Explanation

Equivalence Partition Example - Integer Input

Correct Answer

Explanation

Equivalence Partitions for Integer Values

Correct Answer

Explanation

Boundary Value Selection Rule

Correct Answer

Explanation

Black-Box vs. White-Box Testing

Correct Answer

Explanation

Output Equivalence Partitions

Correct Answer

Explanation

Exception Partitions in White-Box Testing

Correct Answer

Explanation

Identifying Partitions from Specification

Correct Answer

Explanation

Why Programs Behave Similarly Within a Partition

Correct Answer

Explanation

Deriving Test Cases from Partitions

Correct Answer

Explanation

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