add choicerules to test_cpt

[todo]

the fix for the non-default choicerule breaks these tests (sorry)

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cognitivemodels/tests/testthat/test_cpt.R

Lines 17 to 21 in b360bef

	# @todo add choicerules to test_cpt
	# @body the fix for the non-default choicerule breaks these tests (sorry)
	M <- cpt(rp ~ x1 + px + x2 | y1 + py + y2, ref = 0, data = dt, fix = tk_par)
	tol <- .01

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This issue was generated by todo based on a todo comment in b360bef.

[FlorianSeitz]

solved