Fix failing test based on HTTPDecoder that supports informational responses (#470)

Author: fabianfett

Tests/AsyncHTTPClientTests/HTTP1ConnectionTests.swift

@@ -480,13 +480,26 @@ class HTTP1ConnectionTests: XCTestCase {
         XCTAssertEqual(connectionDelegate.hitConnectionClosed, 0)
         XCTAssertEqual(connectionDelegate.hitConnectionReleased, 0)
         XCTAssertNoThrow(try embedded.writeInbound(ByteBuffer(string: responseString)))
-        XCTAssertFalse(embedded.isActive)
-        (embedded.eventLoop as! EmbeddedEventLoop).run() // tick once to run futures.
-        XCTAssertEqual(connectionDelegate.hitConnectionClosed, 1)
-        XCTAssertEqual(connectionDelegate.hitConnectionReleased, 0)
 
-        XCTAssertThrowsError(try requestBag.task.futureResult.wait()) {
-            XCTAssertEqual($0 as? HTTPClientError, .httpEndReceivedAfterHeadWith1xx)
+        if !embedded.isActive {
+            // behavior before https://github.com/apple/swift-nio/pull/1984
+            embedded.embeddedEventLoop.run() // tick once to run futures.
+            XCTAssertEqual(connectionDelegate.hitConnectionClosed, 1)
+            XCTAssertEqual(connectionDelegate.hitConnectionReleased, 0)
+
+            XCTAssertThrowsError(try requestBag.task.futureResult.wait()) {
+                XCTAssertEqual($0 as? HTTPClientError, .httpEndReceivedAfterHeadWith1xx)
+            }
+        } else {
+            // behavior after https://github.com/apple/swift-nio/pull/1984
+            XCTAssertNoThrow(try embedded.close().wait())
+            embedded.embeddedEventLoop.run() // tick once to run futures.
+            XCTAssertEqual(connectionDelegate.hitConnectionClosed, 1)
+            XCTAssertEqual(connectionDelegate.hitConnectionReleased, 0)
+
+            XCTAssertThrowsError(try requestBag.task.futureResult.wait()) {
+                XCTAssertEqual($0 as? HTTPClientError, .remoteConnectionClosed)
+            }
         }
     }