mirror of
https://github.com/dz0ny/meshcore-sar.git
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feat: MeshCore SAR - Flutter BLE mesh radio companion app
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
504
test/services/cayenne_lpp_parser_test.dart
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504
test/services/cayenne_lpp_parser_test.dart
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import 'dart:typed_data';
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import 'package:flutter_test/flutter_test.dart';
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import 'package:latlong2/latlong.dart';
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import 'package:meshcore_sar_app/models/contact_telemetry.dart';
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import 'package:meshcore_sar_app/services/cayenne_lpp_parser.dart';
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import 'package:meshcore_sar_app/services/meshcore_constants.dart';
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void main() {
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group('CayenneLppParser - GPS Codec Tests', () {
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test('GPS encoding uses correct 3-byte signed BE format', () {
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// Test coordinates (Ljubljana, Slovenia)
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const double lat = 46.0569;
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const double lon = 14.5058;
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const double alt = 295.0;
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final encoded = CayenneLppParser.createGpsData(
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latitude: lat,
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longitude: lon,
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altitude: alt,
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channel: 0,
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);
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// Expected format (Standard Cayenne LPP):
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// [0] = channel (0)
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// [1] = type (136 = 0x88 = lppGps)
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// [2-4] = lat as 24-bit signed BE
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// [5-7] = lon as 24-bit signed BE
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// [8-10] = alt as 24-bit signed BE
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expect(encoded.length, equals(11));
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expect(encoded[0], equals(0)); // channel
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expect(encoded[1], equals(MeshCoreConstants.lppGps)); // type 0x88
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// Verify big-endian encoding (3 bytes each)
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final latEncoded = (encoded[2] << 16) | (encoded[3] << 8) | encoded[4];
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final lonEncoded = (encoded[5] << 16) | (encoded[6] << 8) | encoded[7];
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final altEncoded = (encoded[8] << 16) | (encoded[9] << 8) | encoded[10];
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expect(latEncoded, equals(460569)); // 46.0569 * 10000
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expect(lonEncoded, equals(145058)); // 14.5058 * 10000
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expect(altEncoded, equals(29500)); // 295.0 * 100
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});
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test('GPS decoding uses correct 3-byte BE format and divisor', () {
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// Create raw GPS telemetry packet (standard Cayenne LPP format)
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final buffer = <int>[];
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buffer.add(0); // channel
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buffer.add(MeshCoreConstants.lppGps); // type 0x88
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// Lat: 46.0569 * 10000 = 460569 = 0x070719
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buffer.add(0x07); // MSB
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buffer.add(0x07);
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buffer.add(0x19); // LSB
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// Lon: 14.5058 * 10000 = 145058 = 0x0236A2
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buffer.add(0x02);
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buffer.add(0x36);
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buffer.add(0xA2);
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// Alt: 295.0 * 100 = 29500 = 0x7 33C
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buffer.add(0x00);
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buffer.add(0x73);
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buffer.add(0x3C);
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final telemetry = CayenneLppParser.parse(Uint8List.fromList(buffer));
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expect(telemetry.gpsLocation, isNotNull);
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expect(telemetry.gpsLocation!.latitude, closeTo(46.0569, 0.0001));
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expect(telemetry.gpsLocation!.longitude, closeTo(14.5058, 0.0001));
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// Verify altitude is stored in extra data
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expect(telemetry.extraSensorData, isNotNull);
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expect(telemetry.extraSensorData!['altitude_0'], closeTo(295.0, 0.01));
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});
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test('GPS round-trip encoding/decoding maintains precision', () {
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// Test various coordinates
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final testCases = [
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LatLng(46.0569, 14.5058), // Ljubljana
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LatLng(37.7749, -122.4194), // San Francisco
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LatLng(-33.8688, 151.2093), // Sydney
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LatLng(0.0, 0.0), // Null Island
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LatLng(89.9999, 179.9999), // Near max
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LatLng(-89.9999, -179.9999), // Near min
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];
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for (final coords in testCases) {
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final encoded = CayenneLppParser.createGpsData(
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latitude: coords.latitude,
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longitude: coords.longitude,
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altitude: 100.0,
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);
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final decoded = CayenneLppParser.parse(encoded);
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expect(
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decoded.gpsLocation,
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isNotNull,
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reason: 'Failed to decode: $coords',
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);
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expect(
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decoded.gpsLocation!.latitude,
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closeTo(coords.latitude, 0.0001),
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reason: 'Latitude mismatch for $coords',
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);
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expect(
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decoded.gpsLocation!.longitude,
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closeTo(coords.longitude, 0.0001),
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reason: 'Longitude mismatch for $coords',
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);
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}
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});
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test('GPS decoding validates coordinate ranges', () {
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// This test documents that coordinates are decoded correctly
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// and any validation warnings are logged (not enforced)
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// Valid coordinates should decode without issue
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final validBuffer = <int>[];
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validBuffer.add(0); // channel
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validBuffer.add(MeshCoreConstants.lppGps);
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// Lat: 45.0 * 10000 = 450000 = 0x06DDD0 (3 bytes BE)
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validBuffer.addAll([0x06, 0xDD, 0xD0]);
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// Lon: 10.0 * 10000 = 100000 = 0x0186A0 (3 bytes BE)
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validBuffer.addAll([0x01, 0x86, 0xA0]);
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// Alt: 0 (3 bytes BE)
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validBuffer.addAll([0x00, 0x00, 0x00]);
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final telemetry = CayenneLppParser.parse(Uint8List.fromList(validBuffer));
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expect(telemetry.gpsLocation, isNotNull);
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expect(telemetry.gpsLocation!.latitude, closeTo(45.0, 0.0001));
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expect(telemetry.gpsLocation!.longitude, closeTo(10.0, 0.0001));
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});
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test('GPS encoding handles negative coordinates correctly', () {
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const lat = -33.8688;
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const lon = -151.2093;
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final encoded = CayenneLppParser.createGpsData(
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latitude: lat,
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longitude: lon,
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);
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// Verify 3-byte signed encoding
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// Lat: -33.8688 * 10000 = -338688
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// In 24-bit two's complement: -338688 + 0x1000000 = 16438528 = 0xFAD500
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final latEncoded = (encoded[2] << 16) | (encoded[3] << 8) | encoded[4];
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// Lon: -151.2093 * 10000 = -1512093
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// In 24-bit two's complement: -1512093 + 0x1000000 = 15265123 = 0xE8ED63
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final lonEncoded = (encoded[5] << 16) | (encoded[6] << 8) | encoded[7];
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expect(latEncoded, equals(0xFAD500)); // Verify two's complement
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expect(lonEncoded, equals(0xE8ED63));
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// Verify decoding
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final decoded = CayenneLppParser.parse(encoded);
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expect(decoded.gpsLocation!.latitude, closeTo(lat, 0.0001));
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expect(decoded.gpsLocation!.longitude, closeTo(lon, 0.0001));
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});
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test('GPS encoding with altitude uses correct precision', () {
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final encoded = CayenneLppParser.createGpsData(
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latitude: 0.0,
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longitude: 0.0,
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altitude: 1234.56,
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);
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// Altitude is at bytes 8-10 (3 bytes BE)
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// Alt: 1234.56 * 100 = 123456 = 0x01E240
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final altEncoded = (encoded[8] << 16) | (encoded[9] << 8) | encoded[10];
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// Altitude precision is 0.01m (divide by 100)
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expect(altEncoded, equals(123456)); // 1234.56 * 100
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final decoded = CayenneLppParser.parse(encoded);
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expect(decoded.extraSensorData!['altitude_0'], closeTo(1234.56, 0.01));
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});
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test('GPS encoding supports custom channel', () {
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final encoded = CayenneLppParser.createGpsData(
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latitude: 1.0,
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longitude: 2.0,
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channel: 5,
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);
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expect(encoded[0], equals(5)); // channel
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final decoded = CayenneLppParser.parse(encoded);
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expect(decoded.gpsLocation, isNotNull);
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expect(decoded.extraSensorData!['altitude_5'], isNotNull);
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});
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test(
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'OLD BUG: Using 4-byte LE instead of 3-byte BE caused wrong coords',
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() {
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// This test documents the bug that was fixed
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// The old code used 4-byte int32 LE (MeshCore advertisement format)
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// instead of 3-byte signed BE (standard Cayenne LPP format)
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// Real data from device:
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// Hex: 06 f7 08 02 38 0e 01 2c 46
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final realData = <int>[
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0x00, 0x88, // channel 0, type GPS
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0x06, 0xf7, 0x08, // lat (3 bytes BE)
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0x02, 0x38, 0x0e, // lon (3 bytes BE)
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0x01, 0x2c, 0x46, // alt (3 bytes BE)
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];
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// CORRECT decoding (3-byte BE):
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final correctLat =
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((0x06 << 16) | (0xf7 << 8) | 0x08) / 10000.0; // 45.6456°
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final correctLon =
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((0x02 << 16) | (0x38 << 8) | 0x0e) / 10000.0; // 14.5422°
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// OLD BUGGY decoding (4-byte LE - reads wrong bytes!):
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// Would read: lat=06f70802, lon=38010e2c (completely wrong)
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final buggyLatRaw = 0x02 | (0x08 << 8) | (0xf7 << 16) | (0x06 << 24);
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final buggyLat = buggyLatRaw / 10000.0; // 3414.1958° (out of range!)
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// Verify current implementation decodes correctly
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final telemetry = CayenneLppParser.parse(Uint8List.fromList(realData));
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expect(telemetry.gpsLocation, isNotNull);
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expect(telemetry.gpsLocation!.latitude, closeTo(correctLat, 0.0001));
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expect(telemetry.gpsLocation!.longitude, closeTo(correctLon, 0.0001));
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// Verify it doesn't produce the buggy values
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expect(telemetry.gpsLocation!.latitude, isNot(equals(buggyLat)));
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expect(telemetry.gpsLocation!.latitude, lessThan(90.0)); // Valid range
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expect(telemetry.gpsLocation!.latitude, greaterThan(-90.0));
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},
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);
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});
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group('CayenneLppParser - Other Sensor Tests', () {
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test('temperature encoding and decoding', () {
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const tempCelsius = 23.5;
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final encoded = CayenneLppParser.createTemperatureData(
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tempCelsius,
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channel: 1,
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);
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expect(encoded.length, equals(4)); // channel + type + 2 bytes
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expect(encoded[0], equals(1)); // channel
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expect(encoded[1], equals(MeshCoreConstants.lppTemperatureSensor));
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final decoded = CayenneLppParser.parse(encoded);
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expect(decoded.temperature, closeTo(tempCelsius, 0.1));
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});
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test('temperature handles negative values', () {
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const tempCelsius = -15.3;
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final encoded = CayenneLppParser.createTemperatureData(tempCelsius);
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final decoded = CayenneLppParser.parse(encoded);
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expect(decoded.temperature, closeTo(tempCelsius, 0.1));
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});
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test('battery voltage encoding and decoding', () {
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const voltage = 3.85;
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final encoded = CayenneLppParser.createBatteryData(voltage);
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expect(encoded.length, equals(4));
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expect(encoded[1], equals(MeshCoreConstants.lppAnalogInput));
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final decoded = CayenneLppParser.parse(encoded);
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expect(decoded.batteryMilliVolts, closeTo(3850, 1));
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expect(decoded.batteryPercentage, greaterThan(0));
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expect(decoded.batteryPercentage, lessThanOrEqualTo(100));
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});
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test('battery percentage calculation', () {
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// Test battery curve: 3.0V = 0%, 4.2V = 100%
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final testCases = {
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2.8: 0.0, // Below minimum
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3.0: 0.0, // Minimum
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3.6: 50.0, // Middle
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4.2: 100.0, // Maximum
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4.5: 100.0, // Above maximum
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};
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for (final entry in testCases.entries) {
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final voltage = entry.key;
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final expectedPercent = entry.value;
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final encoded = CayenneLppParser.createBatteryData(voltage);
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final decoded = CayenneLppParser.parse(encoded);
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expect(
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decoded.batteryPercentage,
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closeTo(expectedPercent, 1),
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reason: 'Battery ${voltage}V should be ~$expectedPercent%',
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);
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}
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});
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test('analog input is recognized as battery', () {
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final buffer = ByteData(4);
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buffer.setUint8(0, 0); // channel 0
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buffer.setUint8(1, MeshCoreConstants.lppAnalogInput);
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buffer.setInt16(2, 385, Endian.big); // 3.85V * 100
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final decoded = CayenneLppParser.parse(buffer.buffer.asUint8List());
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expect(decoded.batteryPercentage, isNotNull);
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expect(decoded.batteryMilliVolts, closeTo(3850, 1));
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});
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test('voltage sensor is recognized as battery', () {
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final buffer = ByteData(4);
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buffer.setUint8(0, 0);
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buffer.setUint8(1, MeshCoreConstants.lppVoltageSensor);
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buffer.setUint16(2, 385, Endian.big); // 3.85V * 100
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final decoded = CayenneLppParser.parse(buffer.buffer.asUint8List());
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expect(decoded.batteryPercentage, isNotNull);
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expect(decoded.batteryMilliVolts, closeTo(3850, 1));
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});
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test('humidity sensor decoding', () {
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final buffer = ByteData(3);
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buffer.setUint8(0, 0);
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buffer.setUint8(1, MeshCoreConstants.lppHumiditySensor);
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buffer.setUint8(2, 130); // 65% humidity (130 / 2)
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final decoded = CayenneLppParser.parse(buffer.buffer.asUint8List());
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expect(decoded.humidity, equals(65.0));
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});
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test('barometer sensor decoding', () {
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final buffer = ByteData(4);
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buffer.setUint8(0, 0);
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buffer.setUint8(1, MeshCoreConstants.lppBarometer);
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buffer.setUint16(2, 10132, Endian.big); // 1013.2 hPa * 10
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final decoded = CayenneLppParser.parse(buffer.buffer.asUint8List());
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expect(decoded.pressure, closeTo(1013.2, 0.1));
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});
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test('accelerometer sensor stores in extra data', () {
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final buffer = ByteData(8);
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buffer.setUint8(0, 0);
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buffer.setUint8(1, MeshCoreConstants.lppAccelerometer);
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buffer.setInt16(2, 1000, Endian.big); // x: 1.0 g
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buffer.setInt16(4, -500, Endian.big); // y: -0.5 g
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buffer.setInt16(6, 2000, Endian.big); // z: 2.0 g
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final decoded = CayenneLppParser.parse(buffer.buffer.asUint8List());
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expect(decoded.extraSensorData, isNotNull);
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final accel = decoded.extraSensorData!['accelerometer_0'];
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expect(accel['x'], closeTo(1.0, 0.001));
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expect(accel['y'], closeTo(-0.5, 0.001));
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expect(accel['z'], closeTo(2.0, 0.001));
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});
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test('unknown sensor type is skipped gracefully', () {
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final buffer = ByteData(5);
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buffer.setUint8(0, 0);
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buffer.setUint8(1, 255); // Unknown type
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buffer.setUint8(2, 1);
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buffer.setUint8(3, 2);
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buffer.setUint8(4, 3);
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// Should not throw, just skip unknown data
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expect(
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() => CayenneLppParser.parse(buffer.buffer.asUint8List()),
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returnsNormally,
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);
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});
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test('multiple sensors in single packet', () {
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// Create a combined packet with multiple sensors
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final buffer = <int>[];
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// GPS (channel 2) - use channel 2 to avoid battery auto-detection
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buffer.add(2); // channel
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buffer.add(MeshCoreConstants.lppGps);
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// Lat: 46.0569 * 10000 = 460569 = 0x070719 (3 bytes BE)
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buffer.addAll([0x07, 0x07, 0x19]);
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// Lon: 14.5058 * 10000 = 145058 = 0x0236A2 (3 bytes BE)
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buffer.addAll([0x02, 0x36, 0xA2]);
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// Alt: 0 (3 bytes BE)
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buffer.addAll([0x00, 0x00, 0x00]);
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// Temperature (channel 3)
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buffer.add(3); // channel
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buffer.add(MeshCoreConstants.lppTemperatureSensor);
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buffer.add(0x00); // 23.5°C * 10 = 235 (2 bytes BE)
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buffer.add(0xEB);
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// Battery (channel 0 - required for battery detection)
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buffer.add(0); // channel
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buffer.add(MeshCoreConstants.lppAnalogInput);
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buffer.add(0x01); // 3.85V * 100 = 385 (2 bytes BE)
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buffer.add(0x81);
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final decoded = CayenneLppParser.parse(Uint8List.fromList(buffer));
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// All sensors should be decoded
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expect(decoded.gpsLocation, isNotNull);
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expect(decoded.gpsLocation!.latitude, closeTo(46.0569, 0.0001));
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expect(decoded.temperature, closeTo(23.5, 0.1));
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expect(decoded.batteryMilliVolts, closeTo(3850, 1));
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});
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test('empty data returns empty telemetry', () {
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final empty = Uint8List(0);
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final decoded = CayenneLppParser.parse(empty);
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expect(decoded.gpsLocation, isNull);
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expect(decoded.batteryPercentage, isNull);
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expect(decoded.temperature, isNull);
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expect(decoded.extraSensorData, isNull);
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expect(decoded.timestamp, isNotNull); // Timestamp is always set
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});
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test('timestamp is set to parse time', () {
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final before = DateTime.now();
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final data = CayenneLppParser.createTemperatureData(20.0);
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final decoded = CayenneLppParser.parse(data);
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final after = DateTime.now();
|
||||
|
||||
expect(
|
||||
decoded.timestamp.isAfter(before) ||
|
||||
decoded.timestamp.isAtSameMomentAs(before),
|
||||
isTrue,
|
||||
);
|
||||
expect(
|
||||
decoded.timestamp.isBefore(after) ||
|
||||
decoded.timestamp.isAtSameMomentAs(after),
|
||||
isTrue,
|
||||
);
|
||||
});
|
||||
});
|
||||
|
||||
group('CayenneLppParser - ContactTelemetry Properties', () {
|
||||
test('isRecent returns true for fresh telemetry', () {
|
||||
final data = CayenneLppParser.createTemperatureData(20.0);
|
||||
final telemetry = CayenneLppParser.parse(data);
|
||||
|
||||
expect(telemetry.isRecent, isTrue);
|
||||
});
|
||||
|
||||
test('battery status helpers work correctly', () {
|
||||
final lowBattery = ContactTelemetry(
|
||||
batteryPercentage: 15.0,
|
||||
timestamp: DateTime.now(),
|
||||
);
|
||||
expect(lowBattery.isLowBattery, isTrue);
|
||||
expect(lowBattery.batteryStatus, equals('low'));
|
||||
|
||||
final criticalBattery = ContactTelemetry(
|
||||
batteryPercentage: 5.0,
|
||||
timestamp: DateTime.now(),
|
||||
);
|
||||
expect(criticalBattery.isCriticalBattery, isTrue);
|
||||
|
||||
final goodBattery = ContactTelemetry(
|
||||
batteryPercentage: 75.0,
|
||||
timestamp: DateTime.now(),
|
||||
);
|
||||
expect(goodBattery.isLowBattery, isFalse);
|
||||
expect(goodBattery.batteryStatus, equals('good'));
|
||||
});
|
||||
|
||||
test('copyWith creates modified copy', () {
|
||||
final original = ContactTelemetry(
|
||||
gpsLocation: LatLng(1, 2),
|
||||
batteryPercentage: 50.0,
|
||||
temperature: 20.0,
|
||||
timestamp: DateTime.now(),
|
||||
);
|
||||
|
||||
final modified = original.copyWith(temperature: 25.0);
|
||||
|
||||
expect(modified.temperature, equals(25.0));
|
||||
expect(modified.batteryPercentage, equals(50.0)); // Unchanged
|
||||
expect(modified.gpsLocation, equals(original.gpsLocation)); // Unchanged
|
||||
});
|
||||
|
||||
test('toString provides readable output', () {
|
||||
final telemetry = ContactTelemetry(
|
||||
gpsLocation: LatLng(46.0569, 14.5058),
|
||||
batteryPercentage: 75.0,
|
||||
temperature: 23.5,
|
||||
timestamp: DateTime.now(),
|
||||
);
|
||||
|
||||
final str = telemetry.toString();
|
||||
expect(str, contains('ContactTelemetry'));
|
||||
expect(str, contains('46.0569'));
|
||||
expect(str, contains('75'));
|
||||
expect(str, contains('23.5'));
|
||||
});
|
||||
});
|
||||
}
|
||||
Reference in New Issue
Block a user