unit tests

Implementation/PeeredTests/NoteContentCodableTests.swift

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+import Foundation
+import Testing
+
+@testable import Peered
+
+@Suite
+struct NoteContentCodableTests {
+  @Test("encode → decode")
+  func coding() throws {
+    let original = NoteInvitation.NoteContent(
+      title: "My note", noteSnapshot: "Note Sample Snapshot")
+    let data = try JSONEncoder().encode(original)
+    let decoded = try JSONDecoder().decode(NoteInvitation.NoteContent.self, from: data)
+
+    #expect(decoded.title == original.title)
+    #expect(decoded.noteSnapshot == original.noteSnapshot)
+  }
+
+  @Test
+  func containsExpectedKeys() throws {
+    let content = NoteInvitation.NoteContent(title: "Titlee", noteSnapshot: "Snapshott")
+    let data = try JSONEncoder().encode(content)
+    let json = try #require(try? JSONSerialization.jsonObject(with: data) as? [String: String])
+
+    #expect(json["title"] == "Titlee")
+    #expect(json["noteSnapshot"] == "Snapshott")
+  }
+}