Test HTTPClientRequest (AsyncHttpClient#513)

* test `HTTPClientRequest.Prepared` and `HTTPClientRequest.Body`

* add scheme and headers tests

* fix tests

Author: dnadoba

Tests/AsyncHTTPClientTests/HTTPClientRequestTests+XCTest.swift

@@ -0,0 +1,43 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the AsyncHTTPClient open source project
+//
+// Copyright (c) 2018-2019 Apple Inc. and the AsyncHTTPClient project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of AsyncHTTPClient project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+//
+// HTTPClientRequestTests+XCTest.swift
+//
+import XCTest
+
+///
+/// NOTE: This file was generated by generate_linux_tests.rb
+///
+/// Do NOT edit this file directly as it will be regenerated automatically when needed.
+///
+
+extension HTTPClientRequestTests {
+    static var allTests: [(String, (HTTPClientRequestTests) -> () throws -> Void)] {
+        return [
+            ("testCustomHeadersAreRespected", testCustomHeadersAreRespected),
+            ("testUnixScheme", testUnixScheme),
+            ("testHTTPUnixScheme", testHTTPUnixScheme),
+            ("testHTTPSUnixScheme", testHTTPSUnixScheme),
+            ("testGetWithoutBody", testGetWithoutBody),
+            ("testPostWithoutBody", testPostWithoutBody),
+            ("testPostWithEmptyByteBuffer", testPostWithEmptyByteBuffer),
+            ("testPostWithByteBuffer", testPostWithByteBuffer),
+            ("testPostWithSequenceOfUnknownLength", testPostWithSequenceOfUnknownLength),
+            ("testPostWithSequenceWithFixedLength", testPostWithSequenceWithFixedLength),
+            ("testPostWithRandomAccessCollection", testPostWithRandomAccessCollection),
+            ("testPostWithAsyncSequenceOfUnknownLength", testPostWithAsyncSequenceOfUnknownLength),
+            ("testPostWithAsyncSequenceWithKnownLength", testPostWithAsyncSequenceWithKnownLength),
+        ]
+    }
+}