[tests] Different CPUs have different precision

Fix the test to compare the subtraction result to value more
conservative than Double.Epsilon, to account for differences in
different CPU floating point units on Android.

diff --git a/mcs/class/corlib/Test/System/MathTest.cs b/mcs/class/corlib/Test/System/MathTest.cs
index 04e33a90f7ca1ebff835250902a1dc1476a26e22..355b3960b01c10e864abe021e2e19faa9d2d5c77 100644 (file)
--- a/mcs/class/corlib/Test/System/MathTest.cs
+++ b/mcs/class/corlib/Test/System/MathTest.cs
@@ -479,13 +479,24 @@ namespace MonoTests.System
                [Test]
                public void TestPow ()
                {
+                       double precision;
                        int iTest = 1;
-
+#if MONODROID
+                       // It fails on Nexus 9 with
+                       //
+                       //   1.3636094460602122 != 1.3636094460602119
+                       //
+                       // when using double_epsilon. Precision differs between different ARM CPUs, so we
+                       // will just use a more conservative value
+                       precision = 0.000001;
+#else
+                       precision = double_epsilon;
+#endif
                        try {
                                double a = Math.Pow (y, x);
                                double b = 1.363609446060212;
 
-                               Assert.IsTrue ((Math.Abs (a - b) <= double_epsilon), a.ToString ("G99") + " != " + b.ToString ("G99"));
+                               Assert.IsTrue ((Math.Abs (a - b) <= precision), a.ToString ("G99") + " != " + b.ToString ("G99"));
                                iTest++;
                                Assert.IsTrue (double.IsNaN (Math.Pow (y, double.NaN)));
                                iTest++;