System Testing

System testing concept, differences from component testing, emergent behavior, use-case based testing, testing policies

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Views #: 172

Questions #: 12

Time: 10 minutes

Pass Score: 80.0%

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System Testing vs. Component Testing - Key Differences

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System testing during development integrates components to create a version of the system and then tests the integrated whole. Which of the following are key differences between system testing and component testing? Select all that apply.

Components developed by different teams may be integrated at this stage

System testing focuses only on functional requirements, never non-functional ones

System testing is a collective process, whereas component testing is an individual developer process

During system testing, reusable and off-the-shelf components may be integrated with newly developed components

System testing in some companies involves a separate testing team with no involvement from designers and programmers

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Emergent Behavior in System Testing

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All systems have emergent behavior. What does this mean in the context of system testing?

The system progressively improves in performance as more test cycles are completed

Bugs detected during testing emerge from the testing environment, not the code

New features emerge automatically from existing code without developer effort

Some system functionality and characteristics only become apparent when components are integrated and tested together

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Planned vs. Unplanned Emergent Behavior

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Behaviors

×Unexpected duplicate entries allowed in edge cases

×Only authorized users can update data - enforced by integration of both components

Planned emergent behavior

Unplanned emergent behavior

A development team integrates an authentication component with a database update component. They discover that together they enforce a rule that only authorized users can update data - a behavior not present in either component alone. They also discover an unexpected interaction that causes the system to allow duplicate entries in some edge cases. Classify each observed behavior:

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What System Testing Should Focus On

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System testing should focus primarily on which of the following?

Testing the interactions between the components and objects that make up a system

Re-running all unit tests to confirm they still pass with the integrated codebase

Measuring the lines of code covered by all unit tests combined

Verifying that each component was built using the correct design patterns

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Use-Case Based System Testing

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Why is use-case based testing an effective approach for system testing?

Use cases are automatically executable and do not require manual test design

Use cases are cheaper to create than component test cases

Use cases eliminate the need for sequence diagrams in system testing

Use cases force the interactions between several components or objects to occur, making them ideal for testing interactions

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Weather Station System Testing - Sequence Diagram

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The wilderness weather station software summarizes data and reports it to a remote computer. A request for a weather report triggers the following method chain:

What is the correct sequence of method calls triggered when SatComms issues a report request?

SatComms:request - CommsLink:Get(summary) - WeatherStation:reportWeather - WeatherData:summarize

WeatherStation:reportWeather - SatComms:request - WeatherData:summarize - CommsLink:Get(summary)

CommsLink:Get(summary) - WeatherStation:reportWeather - SatComms:request - WeatherData:summarize

SatComms:request - WeatherStation:reportWeather - CommsLink:Get(summary) - WeatherData:summarize

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Interaction Testing and Component Bugs

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Which type of bugs can only be revealed when a component is used by other components in a system test, but not during individual unit testing?

Syntax errors in the component's source code

Memory leaks within a single isolated function

Logic errors within a single method of the component

Component bugs that arise from unexpected interactions and misunderstandings about what the component does

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System Testing Policy - Menu Functions

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When defining a system testing policy for an interactive system, which of the following should be tested? Select all that apply.

The database schema independently of all user interface components

Combinations of functions accessed through the same menu

All individual code statements within each function

All functions where user input is provided, tested with both correct and incorrect inputs

All system functions that are accessed through menus

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Challenges of Automated System Testing

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Why is automated system testing usually more difficult than automated unit or component testing?

Automated unit testing relies on predicting outputs in advance, but system outputs may be large or unpredictable

System tests cannot be encoded as programs because they involve user interfaces

System testing frameworks are not yet mature enough to support automation

System tests require more expensive hardware that is not available in standard CI environments

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Reusable Component Integration in System Testing

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A company integrates a third-party authentication library into their new system during system testing. What is a specific concern that arises when testing reusable or off-the-shelf components during system testing?

Third-party components are always defect-free and do not need testing

Reusable components can only be tested in isolation, never as part of an integrated system

The third-party component must be rewritten to follow the company's internal coding standards

The company must verify that the reusable component works as expected when integrated with their newly developed components

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Why System Testing is a Collective Process

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System testing is described as a collective process. What is the main reason for this?

Components developed by different team members or subteams are brought together, requiring coordination across the team

Collective testing is cheaper because test cases can be reused across team members

A single tester cannot run all system tests within the required time frame

Regulations require multiple signatures on test reports

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Ordering the Testing Stages

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Please drag and drop the options to sort them

Place the three stages of development testing in the correct order from first to last.

System testing - testing interactions when some or all components are integrated

Component testing - testing composite components through their interfaces

Unit testing - testing individual objects or methods in isolation

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System Testing vs. Component Testing - Key Differences

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Emergent Behavior in System Testing

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Planned vs. Unplanned Emergent Behavior

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What System Testing Should Focus On

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Use-Case Based System Testing

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Weather Station System Testing - Sequence Diagram

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Interaction Testing and Component Bugs

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System Testing Policy - Menu Functions

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Challenges of Automated System Testing

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Reusable Component Integration in System Testing

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Why System Testing is a Collective Process

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Ordering the Testing Stages

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