Random tests are completely broken:

Test Failed
  Expected: -106
  But was:  1

It should be 'terrorists', not 'terrorist'...

This kata is too easy in the current form. This could be an interesting kata if both the user and the troll had to be in the user list.

Example:

// baz123 isn't a troll as baz isn't in the array
{"sue", "foo", "bar", "sue123", "baz234"} => {"sue", "foo", "bar", "baz234"}

// baz234 isn't in the result as baz is in the input array.
{"sue", "foo", "baz", "sue123", "baz234"} => {"sue", "foo", "baz"}

Regards,

suic

The description is inconsistent. Either use variable names or example numbers.

The description is incomplete, and the answer is already provided. I'm not sure what the point of this kata is.

Since you did not change the reference solution, we can now talk about the problem in it.

Assert.AreEqual(2, Kata.CountOfWays(2, 3, 4));

Apparently, there are more than 2 ways for arranging 4 from 2 Apples and 3 Pears

AAPP
APAP
APPA
PPAA
PAPA
PAAP

APPP
PAPP
PPAP
PPPA

Actually there are 10....

    public void RandomTest()
    {
      Assert.AreEqual(2, Kata.CountOfWays(2, 3, 4));
      Assert.AreEqual(15, Kata.CountOfWays(4, 2, 6));
    }

Nope, random tests are not recognized by test name. You should actually implement random tests.

There's a compilation error in basic tests:

 fixture.cs(10,49): error CS0103: The name `IsBombDefused' does not exist in the current context

It is Assert.AreEqual("...", IsBombDefused(...)); and should be Assert.AreEqual("...", Kata.IsBombDefused(...));

Also, no random tests.