SortedNotesFolder: Add tests

This way it properly works. I shouldn't be coding so late in the night.

lib/core/sorted_notes_folder.dart

@@ -54,11 +54,6 @@ class SortedNotesFolder with NotesFolderNotifier implements NotesFolder {
 
   void _noteAddedListener(int _, Note note) {
     assert(folder.notes.length == _notes.length + 1);
-    if (note.loadState != NoteLoadState.Loaded) {
-      _notes.add(note);
-      notifyNoteAdded(_notes.length - 1, note);
-      return;
-    }
 
     var i = _insertInCorrectPos(note);
     notifyNoteAdded(i, note);
@@ -85,9 +80,8 @@ class SortedNotesFolder with NotesFolderNotifier implements NotesFolder {
   }
 
   int _insertInCorrectPos(Note note) {
-    var i = _getInsertPos(note, 0, _notes.length);
+    var i = _getInsertPos(note, 0, _notes.length - 1);
     _notes.insert(i, note);
-
     return i;
   }
 
@@ -100,9 +94,9 @@ class SortedNotesFolder with NotesFolderNotifier implements NotesFolder {
       if (r == 0) {
         return mid;
       } else if (r < 0) {
-        return low = mid + 1;
+        low = mid + 1;
       } else {
-        return high = mid - 1;
+        high = mid - 1;
       }
     }
 

test/sorted_notes_folder_test.dart

@@ -0,0 +1,95 @@
+import 'dart:io';
+import 'dart:math';
+
+import 'package:gitjournal/core/notes_folder_fs.dart';
+import 'package:gitjournal/core/sorted_notes_folder.dart';
+import 'package:gitjournal/core/sorting_mode.dart';
+import 'package:gitjournal/core/note.dart';
+import 'package:path/path.dart' as p;
+import 'package:test/test.dart';
+
+void main() {
+  group('Sorted Notes Folder Test', () {
+    Directory tempDir;
+    NotesFolderFS folder;
+
+    setUp(() async {
+      tempDir = await Directory.systemTemp.createTemp('__sorted_folder_test__');
+
+      folder = NotesFolderFS(null, tempDir.path);
+
+      var random = Random();
+      for (var i = 0; i < 5; i++) {
+        var note = Note(
+          folder,
+          p.join(folder.folderPath, "${random.nextInt(1000)}.md"),
+        );
+        note.modified = DateTime(2020, 1, 10 + (i * 2));
+        note.body = "$i";
+        await note.save();
+      }
+      await folder.loadRecursively();
+    });
+
+    tearDown(() async {
+      tempDir.deleteSync(recursive: true);
+    });
+
+    test('Should load the notes sorted', () async {
+      var sf = SortedNotesFolder(
+        folder: folder,
+        sortingMode: SortingMode.Modified,
+      );
+      expect(sf.hasNotes, true);
+      expect(sf.isEmpty, false);
+      expect(sf.name.startsWith("__sorted_folder_test__"), true);
+      expect(sf.subFolders.length, 0);
+      expect(sf.notes.length, 5);
+
+      expect(sf.notes[0].body, "4");
+      expect(sf.notes[1].body, "3");
+      expect(sf.notes[2].body, "2");
+      expect(sf.notes[3].body, "1");
+      expect(sf.notes[4].body, "0");
+    });
+
+    test('Should on modification remains sorted', () async {
+      var sf = SortedNotesFolder(
+        folder: folder,
+        sortingMode: SortingMode.Modified,
+      );
+
+      var i = sf.notes.indexWhere((n) => n.body == "1");
+      sf.notes[i].modified = DateTime(2020, 2, 1);
+
+      expect(sf.notes[0].body, "1");
+      expect(sf.notes[1].body, "4");
+      expect(sf.notes[2].body, "3");
+      expect(sf.notes[3].body, "2");
+      expect(sf.notes[4].body, "0");
+    });
+
+    test('Should add new note correctly', () async {
+      var sf = SortedNotesFolder(
+        folder: folder,
+        sortingMode: SortingMode.Modified,
+      );
+
+      var note = Note(folder, p.join(folder.folderPath, "new.md"));
+      note.modified = DateTime(2020, 2, 1);
+      note.body = "new";
+      await note.save();
+
+      folder.add(note);
+
+      expect(sf.notes.length, 6);
+
+      expect(sf.notes[0].body, "new");
+      expect(sf.notes[1].body, "4");
+      expect(sf.notes[2].body, "3");
+      expect(sf.notes[3].body, "2");
+      expect(sf.notes[4].body, "1");
+      expect(sf.notes[5].body, "0");
+    });
+  });
+}