Remove invalid characters from test results (#26296)

Author: BrennanConroy

src/Servers/Kestrel/shared/test/StringExtensions.cs

@@ -16,7 +16,8 @@ public static string EscapeNonPrintable(this string s)
                 .Replace("\r", @"\x0D")
                 .Replace("\n", @"\x0A")
                 .Replace("\0", @"\x00")
+                .Replace("\x80", @"\x80")
                 + ellipsis;
         }
     }
-}
+}

src/Servers/Kestrel/test/InMemory.FunctionalTests/BadHttpRequestTests.cs

@@ -48,17 +48,34 @@ public Task TestInvalidHeaders(string rawHeaders, string expectedExceptionMessag
                 expectedExceptionMessage);
         }
 
+        public static Dictionary<string, (string header, string errorMessage)> BadHeaderData => new Dictionary<string, (string, string)>
+        {
+            { "Hea\0der: value".EscapeNonPrintable(), ("Hea\0der: value", "Invalid characters in header name.") },
+            { "Header: va\0lue".EscapeNonPrintable(), ("Header: va\0lue", "Malformed request: invalid headers.") },
+            { "Head\x80r: value".EscapeNonPrintable(), ("Head\x80r: value", "Invalid characters in header name.") },
+            { "Header: valu\x80".EscapeNonPrintable(), ("Header: valu\x80", "Malformed request: invalid headers.") },
+        };
+
+        public static TheoryData<string> BadHeaderDataNames => new TheoryData<string>
+        {
+            "Hea\0der: value".EscapeNonPrintable(),
+            "Header: va\0lue".EscapeNonPrintable(),
+            "Head\x80r: value".EscapeNonPrintable(),
+            "Header: valu\x80".EscapeNonPrintable()
+        };
+
         [Theory]
-        [InlineData("Hea\0der: value", "Invalid characters in header name.")]
-        [InlineData("Header: va\0lue", "Malformed request: invalid headers.")]
-        [InlineData("Head\x80r: value", "Invalid characters in header name.")]
-        [InlineData("Header: valu\x80", "Malformed request: invalid headers.")]
-        public Task BadRequestWhenHeaderNameContainsNonASCIIOrNullCharacters(string header, string expectedExceptionMessage)
+        [MemberData(nameof(BadHeaderDataNames))]
+        public Task BadRequestWhenHeaderNameContainsNonASCIIOrNullCharacters(string dataName)
         {
+            // Using dictionary of input data to avoid invalid strings in the xml test results
+            var header = BadHeaderData[dataName].header;
+            var errorMessage = BadHeaderData[dataName].errorMessage;
+
             return TestBadRequest(
                 $"GET / HTTP/1.1\r\n{header}\r\n\r\n",
                 "400 Bad Request",
-                expectedExceptionMessage);
+                errorMessage);
         }
 
         [Theory]