Update episodes/testing.md

Co-authored-by: Sven van der Burg <[email protected]>

episodes/testing.md

@@ -279,7 +279,7 @@ Then discuss together the different solutions.
 
 ## Solution
 
-Add here the preferred solution. We don't have a ready one. 
+We are still working on example code for a solution. But as long as you added tests for all the different conditions and your final `fizz_buzz()` function passes all of them your solution is correct.
 
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