Test and debug returning different values

spec-sum.js

describe('function that sum numbers between 1 and 100', function () {

	var out = sum;

	it('verify if the sum is correct', function () {

		expect( out ).toBeDefined();
		expect( out() ).toBe( 5050 );

	});

});

sum.js

var
	count  = 1,
	limit  = 100,
	result = 0;

function sum () {

	for ( ; count <= limit; count += 1 )
		result += count;

	return result;

}