Write tests for all components/apps about dash-bio HOT 6 CLOSED

Useful command to run only one test pytest --driver Chrome tests/<test file>::<test function within the file>

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@mkcor @Bachibouzouk I'm thinking we can split these up.

@shammamah

• Speck
• Sequence viewer
• Clustergram

@Bachibouzouk

• Alignment chart
• Circos
• Manhattan plot
• Needle plot

@mkcor

• Molecule3D
• Oncoprint
• Ideogram

Let me know if you want to switch anything around!

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@shammamah, @mkcor : I made tests for testing the app works correctly as well as tests for testing the passing of props to the component, ping me if you want to chat about the way I carry out the tests.

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@Bachibouzouk Wonderful! Do you mean it would be more fruitful to have this chat before I review #142 and #143 ?

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Useful to check if the react component changed after modifying a prop value
https://selenium-python.readthedocs.io/locating-elements.html#locating-elements-by-class-name

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As per today's discussion, we want to make sure we are defensive in our demo apps "and the most common way to do it is to add assertions to our code" (https://swcarpentry.github.io/python-novice-inflammation/08-defensive/index.html).
/cc @shammamah @Bachibouzouk

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