Add fixes for problems discovered by xunit.analyzers (#1999)

* Add fixes to tests for problems discovered by xunit.analyzers 0.6.1

* PR feedback. Add comments about why we have a #pragma

test/Kestrel.Core.Tests/FrameConnectionTests.cs

@@ -543,7 +543,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests
 
             await _frameConnection.StopAsync().TimeoutAfter(TimeSpan.FromSeconds(5));
 
-            Assert.Equal(1, scopeObjects.Count);
+            Assert.Single(scopeObjects);
             var pairs = scopeObjects[0].ToDictionary(p => p.Key, p => p.Value);
             Assert.True(pairs.ContainsKey("ConnectionId"));
             Assert.Equal(_frameConnection.ConnectionId, pairs["ConnectionId"]);

test/Kestrel.Core.Tests/FrameTests.cs

@@ -332,7 +332,11 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests
             string requestLine,
             string expectedMethod,
             string expectedRawTarget,
+// This warns that theory methods should use all of their parameters,
+// but this method is using a shared data collection with HttpParserTests.ParsesRequestLine and others.
+#pragma warning disable xUnit1026
             string expectedRawPath,
+#pragma warning restore xUnit1026
             string expectedDecodedPath,
             string expectedQueryString,
             string expectedHttpVersion)

test/Kestrel.Core.Tests/HttpParserTests.cs

@@ -26,8 +26,12 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests
             string expectedMethod,
             string expectedRawTarget,
             string expectedRawPath,
+// This warns that theory methods should use all of their parameters,
+// but this method is using a shared data collection with FrameTests.TakeStartLineSetsFrameProperties and others.
+#pragma warning disable xUnit1026
             string expectedDecodedPath,
             string expectedQueryString,
+#pragma warning restore xUnit1026
             string expectedVersion)
         {
             var parser = CreateParser(Mock.Of<IKestrelTrace>());
@@ -391,7 +395,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests
             parser.ParseHeaders(requestHandler, buffer, out var consumed, out var examined, out var consumedBytes);
 
             var pairs = requestHandler.Headers.ToArray();
-            Assert.Equal(1, pairs.Length);
+            Assert.Single(pairs);
             Assert.Equal(headerName, pairs[0].Key);
             Assert.Equal(expectedHeaderValue, pairs[0].Value);
             Assert.Equal(buffer.End, consumed);

test/Kestrel.Core.Tests/HttpUtilitiesTest.cs

@@ -64,14 +64,15 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests
             var block = new Span<byte>(Encoding.ASCII.GetBytes(input));
 
             // Act
-            HttpVersion knownVersion;
-            var result = block.GetKnownVersion(out knownVersion, out var length);
+            var result = block.GetKnownVersion(out HttpVersion knownVersion, out var length);
             string toString = null;
             if (knownVersion != HttpVersion.Unknown)
             {
                 toString = HttpUtilities.VersionToString(knownVersion);
             }
+
             // Assert
+            Assert.Equal(version, knownVersion);
             Assert.Equal(expectedResult, result);
             Assert.Equal(expectedKnownString, toString);
             Assert.Equal(expectedKnownString?.Length ?? 0, length);

test/Kestrel.FunctionalTests/HttpsConnectionAdapterTests.cs

@@ -232,7 +232,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.FunctionalTests
                 using (var client = new TcpClient())
                 {
                     var stream = await OpenSslStream(client, server);
-                    var ex = await Assert.ThrowsAsync(typeof(IOException),
+                    var ex = await Assert.ThrowsAsync<IOException>(
                         async () => await stream.AuthenticateAsClientAsync("localhost", new X509CertificateCollection(), SslProtocols.Tls, false));
                 }
             }

test/Kestrel.FunctionalTests/RequestTests.cs

@@ -1184,9 +1184,8 @@ namespace Microsoft.AspNetCore.Server.Kestrel.FunctionalTests
             }
         }
 
-        [Theory]
-        [MemberData(nameof(ConnectionAdapterData))]
-        public async Task HeadersAndStreamsAreReusedAcrossRequests(ListenOptions listenOptions)
+        [Fact]
+        public async Task HeadersAndStreamsAreReusedAcrossRequests()
         {
             var testContext = new TestServiceContext();
             var streamCount = 0;