fix equality bug for lineStrings (#12)

* ignore .DS_Store files

* add simple lineString tests

* fix equality bug for lineString

.gitignore

@@ -8,3 +8,4 @@ build/
 # Omit committing pubspec.lock for library packages; see
 # https://dart.dev/guides/libraries/private-files#pubspeclock.
 pubspec.lock
+.DS_Store

lib/src/turf_equality_base.dart

@@ -133,7 +133,7 @@ class Equality {
             line1.coordinates.first, newLine.coordinates.first)) {
           return false;
         } else {
-          _compareLine(line1, newLine);
+          return _compareLine(line1, newLine);
         }
       }
     } else {

test/context/helper.dart

@@ -0,0 +1,25 @@
+import 'package:turf/helpers.dart';
+
+LineString lineString(List<List<int>> coordinates) {
+  return LineString(coordinates: coordinates.toPositions());
+}
+
+Point point(List<double> coordinates) {
+  return Point(coordinates: Position.of(coordinates));
+}
+
+Feature<Polygon> polygon(List<List<List<int>>> coordinates) {
+  return Feature(
+    geometry: Polygon(coordinates: coordinates.toPositions()),
+  );
+}
+
+extension PointsExtension on List<List<int>> {
+  List<Position> toPositions() =>
+      map((position) => Position.of(position)).toList(growable: false);
+}
+
+extension PolygonPointsExtensions on List<List<List<int>>> {
+  List<List<Position>> toPositions() =>
+      map((element) => element.toPositions()).toList(growable: false);
+}

test/geojson_equality_test.dart

@@ -5,7 +5,40 @@ import 'package:turf_equality/turf_equality.dart';
 import 'package:test/test.dart';
 import 'package:turf/helpers.dart';
 
+import 'context/helper.dart';
+
 void main() {
+  group('LineString Equality', () {
+    Equality eq = Equality();
+    test('two points, different values', () {
+      final result = eq.compare(
+        lineString([
+          [125, -30],
+          [135, -30],
+        ]),
+        lineString([
+          [115, -35],
+          [125, -30],
+        ]),
+      );
+      expect(result, false);
+    });
+
+    test('two points, same value', () {
+      final result = eq.compare(
+        lineString([
+          [115, -35],
+          [125, -30],
+        ]),
+        lineString([
+          [115, -35],
+          [125, -30],
+        ]),
+      );
+      expect(result, true);
+    });
+  });
+
   group(
     'Turf GeoJSONEquality',
     () {