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compiler/natives/src/math: Slightly increase tolerances in tests to f…

…ix TestGamma.

Before this change, TestGamma fails with:

	$ gopherjs test --short --minify --run='^Test' math
	--- FAIL: TestGamma (0.08s)
		all_test.go:2234: Gamma(171) = 7.257415615307958e+306, want 7.257415615307999e+306
		all_test.go:2234: Gamma(171.6) = 1.5858969096672286e+308, want 1.5858969096672565e+308
		all_test.go:2234: Gamma(171.624) = 1.794211759924792e+308, want 1.7942117599248104e+308
		all_test.go:2234: Gamma(-171.5) = 1.93162654317124e-310, want 1.9316265431712e-310
	FAIL
	FAIL	math	0.786s

The tolerances are defined with these values upstream in Go 1.8:

	func close(a, b float64) bool      { return tolerance(a, b, 1e-14) }
	func veryclose(a, b float64) bool  { return tolerance(a, b, 4e-16) }
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1 parent b10af79 commit 5e896beff1ab17fc67475207707edf75f30acd8a @shurcooL shurcooL committed Dec 13, 2016
Showing with 12 additions and 0 deletions.
  1. +12 −0 compiler/natives/src/math/math_test.go
@@ -0,0 +1,12 @@
+// +build js
+
+package math_test
+
+// Slighly higher tolerances than upstream, otherwise TestGamma fails.
+// TODO: Is there a better way to fix TestGamma? It's weird that only one test
+// requires increasing tolerances. Perhaps there's a better fix? Maybe we
+// should override TestGamma specifically and not the package-wide tolerances,
+// because this will cause many other tests to be less accurate. Or maybe this
+// is fine?
+func close(a, b float64) bool { return tolerance(a, b, 4e-14) }
+func veryclose(a, b float64) bool { return tolerance(a, b, 6e-15) }

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