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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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For the NUnit Test Framework the expected value should be first and the actual value should be second. In this kata they are swapped. Therefore the output message is confusing. So, the correct value in the error message is in the "But was:..."-section, your answer is in the "Expected:..."-section. For the input value 86400 seconds the correct answer is
24:00:00.C# Test Cases seems to be broken
86400 -seconds
1.00:00:00- my answer
✔ 8 assertions passed
✘ Expected string length 10 but was 8. Strings differ at index 0.
Expected: "1.00:00:00"
But was: "24:00:00"