Learn about testing a command line application that encodes a string using ROT-13. Explore the use of optional patterns such as 'Collaborator-Based Isolation' and 'Output Tracking' to verify the application's functionality. Understand the use of ndLine as a test double in the production code.

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Questions and Answers

What is the purpose of the App?

To encode a string using ROT-13

What is used to verify that the application writes the output it expects?

Tests

What is the purpose of Collaborator-Based Isolation?

To assert that the ROT-13 encoded output is written to the command line

What is Output Tracking used for?

<p>To see what would have been written to stdout</p> Signup and view all the answers

What is ndLine?

<p>A test double</p> Signup and view all the answers

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Study Notes

App is a command line application that encodes a string using ROT-13 and outputs the result.
Tests are used to verify that the application writes the output it expects.
App uses an optional pattern called “Collaborator-Based Isolation” to assert that the ROT-13 encoded output is written to the command line.
Tests also use Output Tracking to see what would have been written to stdout.
ndLine is a test double. But it’s actually production code with an “off” switch and the ability to monitor its output.