unit tests

Implementation/PeeredTests/NoteMessageCodableTests.swift

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+import Foundation
+import Testing
+
+@testable import Peered
+
+@Suite
+struct NoteMessageCodableTests {
+  @Test
+  func encodesToJSON() throws {
+    let message = NoteMessage(senderID: "host", content: "Content")
+    let data = try JSONEncoder().encode(message)
+    let json = try #require(try? JSONSerialization.jsonObject(with: data) as? [String: String])
+
+    #expect(json["senderID"] == "host")
+    #expect(json["content"] == "Content")
+  }
+
+  @Test
+  func decodesFromJSON() throws {
+    let json = #"{"senderID":"host","content":"contentt"}"#
+    let data = try #require(json.data(using: .utf8))
+    let message = try JSONDecoder().decode(NoteMessage.self, from: data)
+
+    #expect(message.senderID == "host")
+    #expect(message.content == "contentt")
+  }
+
+  @Test("encode → decode")
+  func coding() throws {
+    let original = NoteMessage(senderID: "host", content: "coding test")
+    let data = try JSONEncoder().encode(original)
+    let decoded = try JSONDecoder().decode(NoteMessage.self, from: data)
+
+    #expect(decoded.senderID == original.senderID)
+    #expect(decoded.content == original.content)
+  }
+}