From the description, it seems like Upper-case letters are to be expected within input, however it is the exact opposite.Should have mention what constitutes a letter.

Sample tests should have cases for below.

[TestCase("t^e^s^t**^e^r^", 0)]

Also, the example tests in description should mention this more explicitly

Actual and expected are swapped in random tests

This Kata would have less busy work if the letters and values were listed in text rather than a picture.
Perhaps something like this:
{'A', 1},
{'B', 3},
{'C', 3},
{'D', 2},
{'E', 1},
{'F', 4},
{'G', 2},
{'H', 4},
{'I', 1},
{'J', 8},
{'K', 5},
{'L', 1},
{'M', 3},
{'N', 1},
{'O', 1},
{'P', 3},
{'Q', 10},
{'R', 1},
{'S', 1},
{'T', 1},
{'U', 1},
{'V', 4},
{'W', 4},
{'X', 8},
{'Y', 4},
{'Z', 10}