chain-studio-flow-editor/test/flow_node_test.dart

// Widget tests for FlowNode — the canvas card.
//
// Cover: dynamic width grows with long labels, two-column
// body renders both input + output labels, port tooltips are
// attached when supplied, height accounts for max(inputs,
// outputs).

import 'package:fai_studio_flow_editor/src/model/flow_graph.dart';
import 'package:fai_studio_flow_editor/src/widgets/flow_node.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  Widget pump(Widget child) =>
      MaterialApp(home: Scaffold(body: Center(child: child)));

  group('NodeGeometry', () {
    test('widthFor grows beyond minimum when labels are long', () {
      // Bare minimum case.
      expect(
        NodeGeometry.widthFor(maxInputChars: 4, maxOutputChars: 4),
        NodeGeometry.width,
      );
      // Long labels push past the minimum.
      final wide = NodeGeometry.widthFor(
        maxInputChars: 13, // "system_prompt"
        maxOutputChars: 14, // "model_endpoint"
      );
      expect(wide, greaterThan(NodeGeometry.width));
    });

    test('heightFor uses the taller of inputs / outputs', () {
      // 3 inputs + 5 outputs → 5-row body.
      final h35 = NodeGeometry.heightFor(3, 5);
      // 5 inputs + 3 outputs → also 5-row body, same height.
      final h53 = NodeGeometry.heightFor(5, 3);
      expect(h35, h53);
    });

    test('inputPortY/outputPortY align row-for-row', () {
      // Both sides walk the same row geometry from the body's
      // top; that's how the labels stay visually aligned with
      // their dots.
      expect(NodeGeometry.inputPortY(0), NodeGeometry.outputPortY(0));
      expect(NodeGeometry.inputPortY(2), NodeGeometry.outputPortY(2));
    });
  });

  group('FlowNode rendering', () {
    testWidgets('renders both input and output labels', (tester) async {
      await tester.pumpWidget(
        pump(
          const FlowNode(
            id: 'sum',
            title: 'sum',
            subtitle: 'llm.chat@^0',
            inputPortLabels: ['prompt', 'endpoint'],
            outputPortLabels: ['response', 'model_endpoint'],
          ),
        ),
      );
      expect(find.text('prompt'), findsOneWidget);
      expect(find.text('endpoint'), findsOneWidget);
      expect(find.text('response'), findsOneWidget);
      expect(find.text('model_endpoint'), findsOneWidget);
    });

    testWidgets('honors explicit width parameter', (tester) async {
      await tester.pumpWidget(
        pump(
          const FlowNode(
            id: 'x',
            title: 'x',
            inputPortLabels: ['a_very_long_input_label'],
            outputPortLabels: ['another_long_output_label'],
            width: 320,
          ),
        ),
      );
      final size = tester.getSize(find.byType(FlowNode));
      expect(size.width, 320);
    });

    testWidgets('attaches Tooltip when portTooltips is non-empty', (
      tester,
    ) async {
      await tester.pumpWidget(
        pump(
          const FlowNode(
            id: 'sum',
            title: 'sum',
            inputPortLabels: ['prompt'],
            portTooltips: {'prompt': 'The user-facing prompt text.'},
          ),
        ),
      );
      expect(find.byType(Tooltip), findsAtLeastNWidgets(1));
    });
  });

  group('kindForStep', () {
    test('classifies system.approval steps as approval kind', () {
      final approval = FlowStep(id: 'r', use: 'system.approval@^0');
      expect(kindForStep(approval), NodeVisualKind.approval);
    });

    test('classifies generic capabilities as module kind', () {
      final mod = FlowStep(id: 's', use: 'llm.chat@^0');
      expect(kindForStep(mod), NodeVisualKind.module);
    });
  });
}