dart: Deduplicate test data

dart/test/Gherkin_test.dart

@@ -8,7 +8,7 @@ void main()
   final idGenerator = IdGenerator.incrementingGenerator;
 
   test('Use this in readme', () async {
-    final paths = const <String>['test/assets/testdata/good/minimal.feature'];
+    final paths = const <String>['../testdata/good/minimal.feature'];
     final includeSource = false;
     final includeAst = true;
     final includePickles = true;
@@ -24,7 +24,7 @@ void main()
 
 
   test('Provides access to the ast', () async {
-    final paths = const <String>['test/assets/testdata/good/minimal.feature'];
+    final paths = const <String>['../testdata/good/minimal.feature'];
     final includeSource = false;
     final includeAst = true;
     final includePickles = false;
@@ -44,7 +44,7 @@ void main()
   } );
 
   test('Provides access to pickles which are compiled from the ast', () async {
-    final paths = const <String>['test/assets/testdata/good/scenario_outline.feature'];
+    final paths = const <String>['../testdata/good/scenario_outline.feature'];
     final envelopes = await Gherkin.fromPaths( paths
       , false, false, true, idGenerator).toList();
 

dart/test/SuccessfulParsing_test.dart

@@ -16,7 +16,7 @@ void main()
 
     var matcher = TokenMatcher(dialectProvider);
 
-    final goodDir = Directory('test/assets/testdata/good');
+    final goodDir = Directory('../testdata/good');
 
     final filesEntities = goodDir.listSync().where((file) => file.path.endsWith('.feature'));
 

dart/test/Tokenization_test.dart

@@ -18,7 +18,7 @@ void main()
      * java/src/test/java/io/cucumber/gherkin/TokensGenerator.java
      * TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO TODO
      **/
-    final assetDir = 'test/assets';
+    final assetDir = '../';
     final testDataDir = 'testdata/good';
     final path = Directory('$assetDir/$testDataDir');
     final files = path.listSync().where((file) => file.path.endsWith('.feature'));