increase tries to 20 (dotnet/corefx#34342)

Commit migrated from https://github.com/dotnet/corefx/commit/df4c956d32654e77e799e538a67a2c7b13e656d4

diff --git a/src/libraries/System.IO.FileSystem/tests/FileInfo/GetSetTimes.cs b/src/libraries/System.IO.FileSystem/tests/FileInfo/GetSetTimes.cs
index de2f2a4..2790912 100644 (file)
--- a/src/libraries/System.IO.FileSystem/tests/FileInfo/GetSetTimes.cs
+++ b/src/libraries/System.IO.FileSystem/tests/FileInfo/GetSetTimes.cs
@@ -43,7 +43,7 @@ namespace System.IO.Tests
         public FileInfo GetNonZeroNanoseconds()
         {
             FileInfo fileinfo = new FileInfo(GetTestFilePath());
-            for (int i = 0; i < 5; i++)
+            for (int i = 0; i < 20; i++)
             {
                 fileinfo.Create().Dispose();
                 if (HasNonZeroNanoseconds(fileinfo.LastWriteTime))