test less flaky

Author: fabianfett

Sources/AsyncHTTPClient/ConnectionPool/HTTP2/HTTP2Connection.swift

@@ -80,6 +80,10 @@ final class HTTP2Connection {
     private var openStreams = Set<ChannelBox>()
     let id: HTTPConnectionPool.Connection.ID
 
+    var closeFuture: EventLoopFuture<Void> {
+        self.channel.closeFuture
+    }
+
     init(channel: Channel,
          connectionID: HTTPConnectionPool.Connection.ID,
          delegate: HTTP2ConnectionDelegate,

Tests/AsyncHTTPClientTests/HTTP2ConnectionTests.swift

@@ -215,7 +215,7 @@ class HTTP2ConnectionTests: XCTestCase {
             }
         }
 
-        XCTAssertFalse(http2Connection.channel.isActive)
+        XCTAssertNoThrow(try http2Connection.closeFuture.wait())
     }
 }