Add check of tag content to annotated tag test

test/tag_test.dart

@@ -23,14 +23,22 @@ void main() {
 
   test('Parse annotated tag', () async {
     final testDir = await createTempGitDir();
-
     final contents = <String, String>{'something': 'value'};
+    const newTagName = 'newTag';
+    const anotherTagName = 'anotherTag';
 
     await doDescriptorGitCommit(testDir, contents, 'Something');
     final branchRef = await testDir.currentBranch();
 
     await runGit(
-      ['tag', '--annotate', '--message', 'First tag', 'newTag', branchRef.sha],
+      [
+        'tag',
+        '--annotate',
+        '--message',
+        'First tag',
+        newTagName,
+        branchRef.sha
+      ],
       processWorkingDir: testDir.path,
     );
 
@@ -39,14 +47,19 @@ void main() {
         'tag',
         '--annotate',
         '--message',
-        'First tag',
-        'anotherTag',
+        'Second tag',
+        anotherTagName,
         branchRef.sha,
       ],
       processWorkingDir: testDir.path,
     );
 
     final tagsFound = await testDir.tags().toList();
     expect(tagsFound, hasLength(2));
+
+    final alphabeticallyFirstTag = tagsFound.first;
+    expect(alphabeticallyFirstTag.tag, equals(anotherTagName));
+    expect(alphabeticallyFirstTag.objectSha, equals(branchRef.sha));
+    expect(alphabeticallyFirstTag.type, equals('commit'));
   });
 }