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29 lines
1.5 KiB
29 lines
1.5 KiB
dojo.provide("dojox.math.tests.math"); |
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dojo.require("dojox.math"); |
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(function(){ |
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function approx(r){ |
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return Math.floor(r * (1 << 30)) / (1 << 30); |
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} |
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tests.register("dojox.math.tests.factorial", [ |
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// standard integer values |
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function fact0(t){ t.assertEqual(1, dojox.math.factorial(0)); }, |
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function fact1(t){ t.assertEqual(1, dojox.math.factorial(1)); }, |
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function fact2(t){ t.assertEqual(2, dojox.math.factorial(2)); }, |
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function fact5(t){ t.assertEqual(120, dojox.math.factorial(5)); }, |
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// almost integer |
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function fact5minus(t){ t.assertEqual(approx(119.999804750496600), approx(dojox.math.factorial(5-1/1048576))); }, |
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function fact5plus(t){ t.assertEqual(approx(120.000195249840876), approx(dojox.math.factorial(5+1/1048576))); }, |
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// geometric values |
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function factNeg1half(t){ t.assertEqual(Math.sqrt(Math.PI), dojox.math.factorial(-0.5)); }, |
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function factPos1half(t){ t.assertEqual(approx(Math.sqrt(Math.PI)/2), approx(dojox.math.factorial(0.5))); }, |
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function factNeg3halves(t){ t.assertEqual(approx(-Math.sqrt(Math.PI)*2), approx(dojox.math.factorial(-1.5))); }, |
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function factNeg5halves(t){ t.assertEqual(approx(Math.sqrt(Math.PI)*4/3), approx(dojox.math.factorial(-2.5))); }, |
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function factPos5halves(t){ t.assertEqual(approx(Math.sqrt(Math.PI)*15/8), approx(dojox.math.factorial(2.5))); }, |
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// invalid values |
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function factNeg1(t){ t.assertEqual(NaN, dojox.math.factorial(-1)); }, |
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function factNeg2(t){ t.assertEqual(NaN, dojox.math.factorial(-2)); } |
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]); |
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})();
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