tests added

Author: rutvik110

super_editor/test/super_editor/super_editor_placeholders_test.dart

@@ -0,0 +1,100 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter_test_runners/flutter_test_runners.dart';
+import 'package:super_editor/super_editor.dart';
+import 'package:super_editor/super_editor_test.dart';
+
+import 'supereditor_test_tools.dart';
+
+void main() {
+  group("SuperEditor > ", () {
+    testWidgetsOnAllPlatforms("inserts placeholder at the end of the attributed text", (tester) async {
+      final context = await tester //
+          .createDocument()
+          .withCustomContent(MutableDocument(nodes: [
+            ParagraphNode(
+                id: "1",
+                text: AttributedText(
+                  "Hello",
+                  AttributedSpans(
+                    attributions: const [
+                      SpanMarker(
+                        attribution: NamedAttribution("bold"),
+                        offset: 0,
+                        markerType: SpanMarkerType.start,
+                      ),
+                      SpanMarker(
+                        attribution: NamedAttribution("bold"),
+                        offset: 4,
+                        markerType: SpanMarkerType.end,
+                      ),
+                    ],
+                  ),
+                ))
+          ]))
+          .withInputSource(TextInputSource.ime)
+          .useStylesheet(defaultStylesheet.copyWith(
+            inlineWidgetBuilders: [inlineWidgetBuilder],
+          ))
+          .pump();
+
+      Document doc = SuperEditorInspector.findDocument()!;
+      final Editor editor = context.editor;
+
+      // Place the caret at "Hello|".
+      await tester.placeCaretInParagraph(doc.first.id, 5);
+
+      await tester.pump();
+
+      // Insert the placeholder at the current caret offset.
+      editor.execute([const InsertInlinePlaceholderAtCaretRequest(_ExamplePlaceholder())]);
+
+      await tester.pump();
+
+      // Ensure the placeholder is inserted at expected offset while maintaining the text attributions.
+      expect(
+        (doc.getNodeById("1") as ParagraphNode).text,
+        AttributedText(
+            "Hello",
+            AttributedSpans(
+              attributions: const [
+                SpanMarker(
+                  attribution: NamedAttribution("bold"),
+                  offset: 0,
+                  markerType: SpanMarkerType.start,
+                ),
+                SpanMarker(
+                  attribution: NamedAttribution("bold"),
+                  offset: 4,
+                  markerType: SpanMarkerType.end,
+                ),
+              ],
+            ),
+            {
+              5: const _ExamplePlaceholder(),
+            }),
+      );
+    });
+  });
+}
+
+Widget? inlineWidgetBuilder(BuildContext context, TextStyle textStyle, Object placeholder) {
+  if (placeholder is! _ExamplePlaceholder) {
+    return null;
+  }
+
+  return LineHeight(
+      style: textStyle,
+      child: Container(
+          color: Colors.red,
+          padding: const EdgeInsets.symmetric(horizontal: 8),
+          child: Text(
+            'placeholder',
+            style: textStyle,
+          )));
+}
+
+class _ExamplePlaceholder {
+  const _ExamplePlaceholder();
+}