feat: add optional loop field to DeviceInfo

Tests/DuooomiBleSDKTests/PlayModeTests.swift

@@ -20,3 +20,33 @@ final class PlayModeTests: XCTestCase {
         XCTAssertEqual(decoded, .single)
     }
 }
+
+final class DeviceInfoLoopTests: XCTestCase {
+    private func decode(_ json: String) throws -> DeviceInfo {
+        try JSONDecoder().decode(DeviceInfo.self, from: Data(json.utf8))
+    }
+
+    func testLoopMissingDecodesToNil() throws {
+        let json = #"{"name":"d1","size":"360","brand":"duomi","powerlevel":80,"allspace":1024,"freespace":512}"#
+        let info = try decode(json)
+        XCTAssertNil(info.loop)
+    }
+
+    func testLoopZeroDecodesToSingle() throws {
+        let json = #"{"name":"d1","size":"360","brand":"duomi","powerlevel":80,"allspace":1024,"freespace":512,"loop":0}"#
+        let info = try decode(json)
+        XCTAssertEqual(info.loop, .single)
+    }
+
+    func testLoopOneDecodesToLoop() throws {
+        let json = #"{"name":"d1","size":"360","brand":"duomi","powerlevel":80,"allspace":1024,"freespace":512,"loop":1}"#
+        let info = try decode(json)
+        XCTAssertEqual(info.loop, .loop)
+    }
+
+    func testLoopInvalidValueDecodesToNil() throws {
+        let json = #"{"name":"d1","size":"360","brand":"duomi","powerlevel":80,"allspace":1024,"freespace":512,"loop":7}"#
+        let info = try decode(json)
+        XCTAssertNil(info.loop)
+    }
+}