1 Instructions

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When a participant arrives
Consent forms
Give the participant their pre-filled consent form to read and
sign. Double check you have their “go to” language correct.
Once they have signed it, bring them to their assigned computers and have them log in.
Explain what will happen in the experiment
You will work on two problems: a hello world problem, and a saddle points problem. The hello world
problem is very simple, you just write a function
that returns the string “Hello, World”. We have you
do it so that you can get used to running the unit
tests which we will use to evaluate your
Show them how to run the tests for the hello world problem,
and where to put their implementation. Tell them to let you
know when they have a passing test.
Explain the saddle points problem
• Hand them the saddle points problem sheet, and read it to
them, asking if they understand the problem.
• Have them run the test suite for the saddle points problem,
and show them where they will put their implementation.
Tell them they need to get all five tests to pass.

• Tell them they can use the internet to Google things, listen
to music while they work, and use the problem sheet as
scratch paper.
• If they have any questions interpreting the results of the
tests, they should ask for help.
• Tell them that when they’ve finished the first 5 tests, they
should clean up and comment their code, and then they
will be given 5 more tests to work on.
Running the tests
Java: Eclipse
Run the tests by opening the test file and pressing the green
“Play” button in the menu bar. Run the file as a JUnit test.
OR: run the tests from the command line by navigating to the
problem directory and running gradle test:
cd ˜/problems-java/saddle-points/
gradle test
Python: PyCharm
Run the tests by opening the test file and selecting “Run
‘pytest for test file name.py’ ”.
OR: run the tests from the command line by navigating to the
problem directory and running pytest:
cd ˜/problems-python/saddle-points/
pytest
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