No more help needed, I found the origin.

I am testing Huffman encoding in Python: Passed tests : 2781 but Failed tests: 265

I don't undestand the following error
Log
frequencies(l)
l
encode([],l)
Test Passed
ERROR restore sorted sequence from frequencies should succeed: [] should equal ['l']

Can you help me Please

Is is possible to have the description of the 6th test "Should be invalid", I obtain the following error
Invalid value types (boolean): True should equal False

but I don't know why !!!