How to test the value of an argument using Mocha and assert.throws in JavaScript? -

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i want see if value equals 'x' cause function throw exception. have unit test checks if block throw exception, want exception thrown if argument = 'x', not if empty. how do using assert?

here's code illustrate mean: 

// function check if color not transparent. function checkcolor(color) {   if (color == 'transparent') {     throw new typeerror('cant have transparent colors!');   } else {     return color;   } }

here's assert:

assert.throws(checkcolor, /cant have transparent colors!/);

now, know assertion fail because function throws exception if color == 'transparent'. using mocha , assert, how test assertion want it? don't want merely test if color !== undefined or of type. want see if exception raised under specific circumstance above - circumstance want exception raised (since having empty color, handled elsewhere).

assert.throw(function() { ithrowerror(argument) }, error)

now make sure argument = x;


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