Unit Testing

This quiz covers unit testing concept, object class testing, weather station example, state sequences, automated unit tests (setup/call/assertion), mock objects

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Views #: 188

Questions #: 12

Time: 10 minutes

Pass Score: 80.0%

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Three Stages of Development Testing

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To complete the line match

Click on an item in the first group
Click on an item in the second group
To delete a match, double click on a line

Stage

Component testing

System testing

Unit testing

Focus

Testing component interactions in a partial or complete system

Testing the functionality of objects or methods individually

Testing component interfaces that provide access to component functions

Development testing includes three stages. Match each stage to its correct focus.

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Unit Testing Scope

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What is the primary subject of unit testing?

Individual program units such as methods or object classes

The deployment infrastructure and environment configuration

The complete system tested against its requirements specification

The interactions between all components in a fully integrated system

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Testing Object Classes Comprehensively

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When testing object classes, which of the following should be covered to achieve comprehensive testing? Select all that apply.

Test only the public interface methods

Put the object into all possible states

Test all operations associated with the object

Simulate all events that cause a state change

Set and check the value of all attributes associated with the object

Only test the most frequently called methods

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Weather Station Object - Unit Testing

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Consider a WeatherStation object with a single constant attribute (identifier) and methods including reportWeather(), reportStatus(), powerSave(), remoteControl(), reconfigure(), restart(), and shutdown().

Why must the restart() method be executed before testing the shutdown() method?

Because restart() initializes the identifier attribute that shutdown() reads

Because automated test frameworks require alphabetical method ordering

Because restart() and shutdown() share the same parameter list

Because shutdown() has a dependency on the running state established by restart()

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Inheritance and Object Class Testing

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Why does inheritance or generalization make object class testing more complicated?

Inherited methods are hidden and cannot be called directly during testing

Inheritance prevents the use of automated test frameworks like JUnit

Inherited methods are always slower and require performance testing

An inherited operation may make assumptions about other operations and attributes that may not be valid in all subclasses

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State Sequence Testing for Weather Station

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Using a state model, testers identify sequences of state transitions to test. Which of the following are valid state transition sequences for the weather station that should be tested? Select all that apply.

Running - Collecting - Running - Summarizing - Transmitting - Running

Running - Shutdown - Configuring - Running

Shutdown - Running - Shutdown

Configuring - Running - Testing - Transmitting - Running

Transmitting - Shutdown - Transmitting

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Three Parts of an Automated Test

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Please drag and drop the options to sort them

An automated unit test has three standard parts. Arrange them in the correct order.

Assertion part - compare the result of the call with the expected result

Call part - call the object or method to be tested

Setup part - initialize the system with the test case inputs and expected outputs

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Automated Test Assertion Outcome

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In an automated unit test, what happens when the assertion evaluates to false?

The test framework re-runs the test with different inputs automatically

The test is flagged as inconclusive and requires manual review

The test has failed, indicating the actual result did not match the expected result

The test framework skips the test and moves on to the next one

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Purpose of Mock Objects

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What is the primary purpose of using mock objects in unit testing?

To permanently replace real objects with simpler versions in the production system

To simulate external objects when dependencies are unavailable or slow down testing

To automatically generate assertion code for complex object states

To generate random inputs for stress testing the unit under test

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Mock Object Example - Database

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A development team is unit testing a class that calls a database to retrieve customer records. The database setup takes 30 seconds each test run. They decide to use a mock object. What would the mock object database typically contain?

A complete copy of the production database with all real customer records

A file system copy of the database that is read directly from disk

Only a few data items organized in an array, accessible quickly without database overhead

An automated query generator that creates random SQL statements

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Mock Objects for Rare Events

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Beyond replacing slow dependencies, mock objects can also be used for another purpose in unit testing. What is this additional use?

To replace the assertion framework with a simpler comparison mechanism

To provide parallel test execution on multiple threads

To simulate abnormal operations or rare events that are difficult to trigger in real systems

To generate automated documentation from test results

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Unit Testing and Debugging Relationship

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Complete the statement about the relationship between development testing and debugging: "Development testing is primarily a (1) process and is usually interleaved with (2) - the process of locating problems with the code and changing the program to fix these problems."

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

code review

validation testing

debugging

defect testing

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Undergraduate Professional

Three Stages of Development Testing

Stage

Focus

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Unit Testing Scope

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Explanation

Testing Object Classes Comprehensively

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Explanation

Weather Station Object - Unit Testing

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Inheritance and Object Class Testing

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State Sequence Testing for Weather Station

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Three Parts of an Automated Test

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Automated Test Assertion Outcome

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Purpose of Mock Objects

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Mock Object Example - Database

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Mock Objects for Rare Events

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Unit Testing and Debugging Relationship

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