Add Gherkin comments support

lib/src/bdd_line.dart

@@ -19,6 +19,7 @@ enum LineType {
   scenario,
   scenarioOutline,
   step,
+  comment,
   dataTableStep,
   after,
   examples,
@@ -54,6 +55,9 @@ LineType _lineTypeFromString(String line) {
   if (tagMarkers.any((marker) => line.startsWith(marker))) {
     return LineType.tag;
   }
+  if (commentMarkers.any((marker) => line.startsWith(marker))) {
+    return LineType.comment;
+  }
   return LineType.unknown;
 }
 
@@ -66,6 +70,7 @@ const scenarioOutlineMarkers = ['Scenario Outline:'];
 const stepMarkers = ['Given', 'When', 'Then', 'And', 'But'];
 const examplesMarkers = ['|'];
 const examplesTitleMarkers = ['Examples:', 'Scenarios:'];
+const commentMarkers = ['#'];
 
 String _removeLinePrefix(String rawLine) {
   final lines = rawLine.split(' ');

lib/src/feature_file.dart

@@ -92,7 +92,9 @@ class FeatureFile {
   List<StepFile> getStepFiles() => _stepFiles;
 
   static List<BddLine> _prepareLines(Iterable<BddLine> input) {
-    final inputList = input.toList(growable: false);
+    final inputList = input
+        .where((line) => line.type != LineType.comment)
+        .toList(growable: false);
     final lines = inputList
         .mapIndexed(
           (index, bddLine) {

test/comment_test.dart

@@ -22,6 +22,43 @@ import 'package:flutter_test/flutter_test.dart';
 
 import './step/the_app_is_running.dart';
 
+void main() {
+  group(\'\'\'Testing feature\'\'\', () {
+    testWidgets(\'\'\'Testing scenario\'\'\', (tester) async {
+      await theAppIsRunning(tester);
+    });
+  });
+}
+''';
+
+    final feature = FeatureFile(
+      featureDir: 'test.feature',
+      package: 'test',
+      input: featureFile,
+    );
+    expect(feature.dartContent, expectedFeatureDart);
+  });
+
+  test('Gherkin comments are ignored', () {
+    const featureFile = '''
+# This is a comment
+
+Feature: Testing feature
+  #One more comment
+  Scenario: Testing scenario
+# Another comment
+    Given the app is running
+''';
+
+    const expectedFeatureDart = '''
+// GENERATED CODE - DO NOT MODIFY BY HAND
+// ignore_for_file: type=lint, type=warning
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import './step/the_app_is_running.dart';
+
 void main() {
   group(\'\'\'Testing feature\'\'\', () {
     testWidgets(\'\'\'Testing scenario\'\'\', (tester) async {

test/full_set_test.dart

@@ -5,8 +5,10 @@ import 'package:test/test.dart';
 void main() {
   test('fully custom test ', () {
     const featureFile = '''
+# This is a comment
 @customFeatureTag
 Feature: Counter
+    This is a comment too
     Background:
         Given the app is running
     After:
@@ -19,6 +21,7 @@ Feature: Counter
         Then I see {'0'} text
 Feature: Counter 2
     Background:
+    #One more comment
         Given the app is running
     Scenario: Initial counter value is 0
         Given the app is running