Disable some tests on Unix

These are tests we expect to fail because of known debt in
Globalization and Crypto cross platform but were not previously marked
because tests were not running in CI.

Author: ellismg

src/System.Globalization.Extensions/tests/IdnMapping/IdnMappingThrows.cs

@@ -22,6 +22,7 @@ public static void GetAsciiThrows()
         }
 
         [Fact]
+        [ActiveIssue(810, PlatformID.AnyUnix)]
         public static void GetUnicodeThrows()
         {
             IdnMapping idnMapping = new IdnMapping();

src/System.Security.Cryptography.Encoding/tests/Oid.cs

@@ -118,6 +118,7 @@ public static void TestFriendlyNameProperty()
         }
 
         [Fact]
+        [ActiveIssue(1863, PlatformID.AnyUnix)]
         public static void TestFromFriendlyName()
         {
             Oid oid;
@@ -138,6 +139,7 @@ public static void TestFromFriendlyName()
         }
 
         [Fact]
+        [ActiveIssue(1863, PlatformID.AnyUnix)]
         public static void TestFromOidValue()
         {
             Oid oid;
@@ -158,6 +160,7 @@ public static void TestFromOidValue()
         }
 
         [Fact]
+        [ActiveIssue(1863, PlatformID.AnyUnix)]
         public static void TestKnownValues()
         {
             Oid oid;

src/System.Text.Encoding/tests/Encoding/Encoding.cs

@@ -17,6 +17,7 @@ public class EncodingTest
         private static byte[] s_UTF8BEBom = new byte[] { 0xFE, 0xFF };
 
         [Fact]
+        [ActiveIssue(846, PlatformID.AnyUnix)]
         public static void TestGetEncoding()
         {
             Encoding encoding = Encoding.GetEncoding("UTF-32LE");
@@ -129,6 +130,7 @@ public CodePageMapping(string name, int codepage)
     };
 
         [Fact]
+        [ActiveIssue(846, PlatformID.AnyUnix)]
         public static void TestEncodingNameAndCopdepageNumber()
         {
             foreach (var map in s_mapping)
@@ -177,6 +179,7 @@ public static void TestEncodingDisplayNames()
         }
 
         [Fact]
+        [ActiveIssue(846, PlatformID.AnyUnix)]
         public static void TestCodePageToWebNameMappings()
         {
             foreach (var mapping in s_codePageToWebNameMappings)

src/System.Text.Encoding/tests/Encoding/EncodingGetChars1.cs

@@ -215,30 +215,35 @@ public void PosTest34()
         }
 
         [Fact]
+        [ActiveIssue(846, PlatformID.AnyUnix)]
         public void PosTest35()
         {
             PositiveTestString(Encoding.GetEncoding("UTF-16BE"), "TestTest\uFFFD", new byte[] { 0, 84, 0, 101, 0, 115, 0, 116, 0, 84, 0, 101, 0, 115, 0, 116, 216, 3 }, "00I4");
         }
 
         [Fact]
+        [ActiveIssue(846, PlatformID.AnyUnix)]
         public void PosTest36()
         {
             PositiveTestString(Encoding.GetEncoding("UTF-16BE"), "\uFFFD\uFFFD", new byte[] { 216, 3, 48 }, "00J4");
         }
 
         [Fact]
+        [ActiveIssue(846, PlatformID.AnyUnix)]
         public void PosTest37()
         {
             PositiveTestString(Encoding.GetEncoding("UTF-16BE"), "\uD803\uDD75\uD803\uDD75\uD803\uDD75", new byte[] { 216, 3, 221, 117, 216, 3, 221, 117, 216, 3, 221, 117 }, "00K4");
         }
 
         [Fact]
+        [ActiveIssue(846, PlatformID.AnyUnix)]
         public void PosTest38()
         {
             PositiveTestString(Encoding.GetEncoding("UTF-16BE"), "\u0130", new byte[] { 1, 48 }, "00L4");
         }
 
         [Fact]
+        [ActiveIssue(846, PlatformID.AnyUnix)]
         public void PosTest39()
         {
             PositiveTestString(Encoding.GetEncoding("UTF-16BE"), "\uD803\uDD75\uD803\uDD75", new byte[] { 216, 3, 221, 117, 216, 3, 221, 117 }, "0A24");

src/System.Text.Encoding/tests/Encoding/EncodingGetEncoding2.cs

@@ -21,6 +21,7 @@ public void PosTest1()
 
         // PosTest2: Get Encoding with the defined name 4
         [Fact]
+        [ActiveIssue(846, PlatformID.AnyUnix)]
         public void PosTest2()
         {
             string name = "Unicode";
@@ -32,6 +33,7 @@ public void PosTest2()
         #region NegativeTest
         // NegTest1: the name is not valid codepage name
         [Fact]
+        [ActiveIssue(846, PlatformID.AnyUnix)]
         public void NegTest1()
         {
             string name = null;
@@ -43,6 +45,7 @@ public void NegTest1()
 
         // NegTest2: The platform do not support the named codepage
         [Fact]
+        [ActiveIssue(846, PlatformID.AnyUnix)]
         public void NegTest2()
         {
             string name = "helloworld";

src/System.Text.Encoding/tests/project.json

@@ -11,6 +11,7 @@
     "xunit.abstractions.netcore": "1.0.0-prerelease",
     "xunit.assert": "2.0.0-beta5-build2785",
     "xunit.core.netcore": "1.0.1-prerelease",
+    "xunit.netcore.extensions": "1.0.0-prerelease-*",
     "xunit.runner.visualstudio": "0.99.9-build1021"
   },
   "frameworks": {