add new analyzer test

dartdoc_test/lib/src/analyzer.dart

@@ -25,9 +25,10 @@ void getAnalysisResult(
   final result = await context.currentSession.getErrors(file.path);
   if (result is ErrorsResult) {
     for (final e in result.errors) {
+      print(e.toString());
       final span = toOriginalFileSpanFromSampleError(file, e);
       if (span != null) print(span.toString());
-      print(e.message);
+      // print(e.message);
     }
   }
 }
@@ -49,14 +50,14 @@ FileSpan? toOriginalFileSpanFromSampleError(
   return originSpan;
 }
 
-class AnalyzeResult {
-  final String filePath;
-  final FileSpan span;
-  final List<String> errors;
-
-  AnalyzeResult({
-    required this.filePath,
-    required this.span,
-    required this.errors,
-  });
+// get original file span from sample file span
+SourceSpan? getOriginalSubSpan({
+  required SourceSpan sample,
+  required SourceSpan original,
+}) {
+  final offset = original.text.indexOf(sample.text);
+  if (offset == -1) {
+    return null;
+  }
+  return original.subspan(offset, offset + sample.length - 1);
 }

dartdoc_test/test/analyzer_test.dart

@@ -0,0 +1,54 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import 'package:dartdoc_test/src/analyzer.dart';
+import 'package:source_span/source_span.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('getOriginalSubSpan', () {
+    test('should return SourceSpan if sample is found in original', () {
+      final sample = SourceSpan(
+        SourceLocation(5),
+        SourceLocation(11),
+        'main()',
+      );
+      final original = SourceSpan(
+        SourceLocation(20),
+        SourceLocation(38),
+        '/// void main() {}',
+      );
+      final result = getOriginalSubSpan(sample: sample, original: original);
+      print(result);
+      expect(result, isNotNull);
+    });
+
+    test('should return null if sample is not found in original', () {
+      final sample = SourceSpan(
+        SourceLocation(0),
+        SourceLocation(17),
+        'import "dart:io";',
+      );
+      final original = SourceSpan(
+        SourceLocation(20),
+        SourceLocation(38),
+        '/// void main() {}',
+      );
+      final result = getOriginalSubSpan(sample: original, original: sample);
+      expect(result, isNull);
+    });
+  });
+
+  // TODO: add emoji offset test
+}