Move to Bytes from Data, simplify result cases

Tests/AppTests/AppTests.swift

@@ -12,11 +12,11 @@ final class AppTests: XCTestCase {
 
     func testEncodingContent() {
         let input = Message.Content(time: 1234567890, id: 23456789)
-        let data = input.encoded
+        let data = input.bytes
         let output = Message.Content(decodeFrom: data)
         XCTAssertEqual(input, output)
-        let data2 = Data([42, 42]) + data
-        let output2 = Message.Content(decodeFrom: Data(data2[2...]))
+        let data2 = [42, 42] + data
+        let output2 = Message.Content(decodeFrom: data2[2...])
         XCTAssertEqual(input, output2)
     }
 
@@ -42,4 +42,12 @@ final class AppTests: XCTestCase {
         XCTAssertEqual(decoded!, input)
         XCTAssertEqual(content, input.content)
     }
+
+    func testMessageTransmission() throws {
+        let app = Application(.testing)
+        defer { app.shutdown() }
+        try configure(app)
+
+        // How to open a socket via request?
+    }
 }