test: cover ComposerDraftStore isolation, truncation, and reset

Pinned cases for mesh/geo/DM keys and the panic-wipe clear path.

bitchatTests/Services/ComposerDraftStoreTests.swift

@@ -0,0 +1,64 @@
+import Foundation
+import Testing
+@testable import bitchat
+import BitFoundation
+
+struct ComposerDraftStoreTests {
+    private func makeDefaults() -> UserDefaults {
+        let suite = "bitchat.tests.drafts.\(UUID().uuidString)"
+        return UserDefaults(suiteName: suite)!
+    }
+
+    @Test func emptyDraftIsNotStored() {
+        let defaults = makeDefaults()
+        ComposerDraftStore.save("hello", for: .mesh, in: defaults)
+        ComposerDraftStore.save("   ", for: .mesh, in: defaults)
+        // Whitespace-only is still a draft the user typed; empty string clears.
+        ComposerDraftStore.save("", for: .mesh, in: defaults)
+        #expect(ComposerDraftStore.load(.mesh, in: defaults).isEmpty)
+        #expect(defaults.object(forKey: ComposerDraftStore.storageKey) == nil)
+    }
+
+    @Test func draftsAreIsolatedPerConversation() {
+        let defaults = makeDefaults()
+        let peer = PeerID(str: "aabbccddeeff0011")
+        ComposerDraftStore.save("mesh draft", for: .mesh, in: defaults)
+        ComposerDraftStore.save("geo draft", for: .location(geohash: "u4pruy"), in: defaults)
+        ComposerDraftStore.save("dm draft", for: .privatePeer(peer), in: defaults)
+
+        #expect(ComposerDraftStore.load(.mesh, in: defaults) == "mesh draft")
+        #expect(ComposerDraftStore.load(.location(geohash: "u4pruy"), in: defaults) == "geo draft")
+        #expect(ComposerDraftStore.load(.privatePeer(peer), in: defaults) == "dm draft")
+        #expect(ComposerDraftStore.load(.location(geohash: "other"), in: defaults).isEmpty)
+    }
+
+    @Test func geohashKeysAreCaseInsensitive() {
+        let defaults = makeDefaults()
+        ComposerDraftStore.save("city chat", for: .location(geohash: "U4PRUY"), in: defaults)
+        #expect(ComposerDraftStore.load(.location(geohash: "u4pruy"), in: defaults) == "city chat")
+    }
+
+    @Test func keyFromPeerAndChannelPrefersPrivate() {
+        let peer = PeerID(str: "aabbccddeeff0011")
+        let key = ComposerDraftStore.Key.from(
+            peerID: peer,
+            channel: .location(GeohashChannel(level: .city, geohash: "u4pruy"))
+        )
+        #expect(key == .privatePeer(peer))
+    }
+
+    @Test func longDraftsAreTruncated() {
+        let defaults = makeDefaults()
+        let long = String(repeating: "a", count: ComposerDraftStore.maxDraftLength + 50)
+        ComposerDraftStore.save(long, for: .mesh, in: defaults)
+        #expect(ComposerDraftStore.load(.mesh, in: defaults).count == ComposerDraftStore.maxDraftLength)
+    }
+
+    @Test func resetClearsAllDrafts() {
+        let defaults = makeDefaults()
+        ComposerDraftStore.save("keep quiet", for: .mesh, in: defaults)
+        ComposerDraftStore.reset(in: defaults)
+        #expect(ComposerDraftStore.load(.mesh, in: defaults).isEmpty)
+        #expect(defaults.object(forKey: ComposerDraftStore.storageKey) == nil)
+    }
+}