Enable testings using HTTPS on macOS

Author: mayuki

test/YetAnotherHttpHandler.Test/Helpers/Testing/ConditionalFactAttribute.cs

@@ -41,7 +41,7 @@ public async Task FailedToConnect_VersionMismatch()
         Assert.Contains("'HTTP_1_1_REQUIRED' (0xd)", ex.Message);
     }
 
-    [ConditionalFact]
+    [Fact]
     public async Task Request_Version_20_Http1OnlyServer_Secure()
     {
         // Arrange

test/YetAnotherHttpHandler.Test/Helpers/Testing/ConditionalFactDiscoverer.cs

@@ -8,7 +8,6 @@
 
 namespace _YetAnotherHttpHandler.Test;
 
-[OSSkipCondition(OperatingSystems.MacOSX)] // .NET 7 or earlier does not support ALPN on macOS.
 public class Http2Test(ITestOutputHelper testOutputHelper) : Http2TestBase(testOutputHelper)
 {
     protected override YetAnotherHttpHandler CreateHandler()
@@ -39,7 +38,7 @@ protected override Task<TestWebAppServer> LaunchServerAsyncCore<T>(Action<WebApp
         });
     }
 
-    [ConditionalFact]
+    [Fact]
     public async Task SelfSignedCertificate_NotTrusted()
     {
         // Arrange
@@ -55,7 +54,7 @@ public async Task SelfSignedCertificate_NotTrusted()
         Assert.IsType<HttpRequestException>(ex);
     }
 
-    [ConditionalFact]
+    [Fact]
     public async Task SelfSignedCertificate_NotTrusted_SkipValidation()
     {
         // Arrange
@@ -72,7 +71,7 @@ public async Task SelfSignedCertificate_NotTrusted_SkipValidation()
         Assert.Equal("__OK__", result);
     }
 
-    [ConditionalFact]
+    [Fact]
     public async Task SelfSignedCertificate_Trusted_CustomRootCA()
     {
         // Arrange
@@ -94,7 +93,7 @@ public async Task SelfSignedCertificate_Trusted_CustomRootCA()
         Assert.Equal("__OK__", result);
     }
 
-    [ConditionalFact]
+    [Fact]
     public async Task CustomCertificateVerificationHandler_Success()
     {
         // Arrange
@@ -118,7 +117,7 @@ public async Task CustomCertificateVerificationHandler_Success()
         Assert.Equal("__OK__", result);
     }
 
-    [ConditionalFact]
+    [Fact]
     public async Task CustomCertificateVerificationHandler_Failure()
     {
         // Arrange
@@ -141,7 +140,7 @@ public async Task CustomCertificateVerificationHandler_Failure()
         Assert.IsType<HttpRequestException>(ex);
     }
 
-    [ConditionalFact]
+    [Fact]
     public async Task CustomCertificateVerificationHandler_Certificate()
     {
         // Arrange