Fix build break

Author: kg

src/libraries/System.Text.Json/tests/System.Text.Json.Tests/JsonTestHelper.cs

@@ -398,7 +398,7 @@ public static byte[] ReaderLoop(int inpuDataLength, out int length, ref Utf8Json
                 ReadOnlySpan<byte> valueSpan = json.HasValueSequence ? json.ValueSequence.ToArray() : json.ValueSpan;
                 if (json.HasValueSequence)
                 {
-                    Assert.True(json.ValueSpan == default);
+                    Assert.True(json.ValueSpan.IsEmpty);
                     if ((tokenType != JsonTokenType.String && tokenType != JsonTokenType.PropertyName) || json.GetString().Length != 0)
                     {
                         // Empty strings could still make this true, i.e. ""
@@ -411,7 +411,7 @@ public static byte[] ReaderLoop(int inpuDataLength, out int length, ref Utf8Json
                     if ((tokenType != JsonTokenType.String && tokenType != JsonTokenType.PropertyName) || json.GetString().Length != 0)
                     {
                         // Empty strings could still make this true, i.e. ""
-                        Assert.False(json.ValueSpan == default);
+                        Assert.False(json.ValueSpan.IsEmpty);
                     }
                 }
                 switch (tokenType)

src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Utf8JsonReaderTests.MultiSegment.cs

@@ -1089,7 +1089,7 @@ private static void TestReadingJsonWithComments(byte[] inputData, ReadOnlySequen
                     builder.Append(Encoding.UTF8.GetString(json.HasValueSequence ? json.ValueSequence.ToArray() : json.ValueSpan.ToArray()));
                     if (json.HasValueSequence)
                     {
-                        Assert.True(json.ValueSpan == default);
+                        Assert.True(json.ValueSpan.IsEmpty);
                     }
                     else
                     {
@@ -1112,7 +1112,7 @@ private static void TestReadingJsonWithComments(byte[] inputData, ReadOnlySequen
                     builder.Append(Encoding.UTF8.GetString(json.HasValueSequence ? json.ValueSequence.ToArray() : json.ValueSpan.ToArray()));
                     if (json.HasValueSequence)
                     {
-                        Assert.True(json.ValueSpan == default);
+                        Assert.True(json.ValueSpan.IsEmpty);
                     }
                     else
                     {
@@ -1158,7 +1158,7 @@ private static void TestReadingSingleValueJson(byte[] inputData, ReadOnlySequenc
 
                     if (json.HasValueSequence)
                     {
-                        Assert.True(json.ValueSpan == default);
+                        Assert.True(json.ValueSpan.IsEmpty);
                     }
                     else
                     {