Remove unused go_router imports by Copilot · Pull Request #206 · richardthe3rd/cambridge-beer-festival-app

Copilot · 2026-01-08T19:51:36Z

Code Simplification - Reduce Duplication

Completed

Remove unused go_router imports from brewery_screen.dart and style_screen.dart
Fix failing tests caused by behavior change in drink_detail_screen
Add comprehensive test coverage for new utility functions
Update golden files to reflect consistent navigation behavior

Changes Made

Removed unused imports (commit c8efc38)
- Removed go_router imports from brewery_screen.dart and style_screen.dart
- These screens now use helper functions that encapsulate the routing dependency
Fixed test failures (this commit)
- Root cause: The old _canPop() method in drink_detail_screen returned true when GoRouter was unavailable (inconsistent with other screens)
- Fix: Unified behavior with canPopNavigation() which returns false when GoRouter is unavailable (consistent with brewery_screen and style_screen)
- Impact: Golden files updated to show home button instead of back button in test environment (expected behavior)
Added test coverage (this commit)
- Created test/utils/widget_builders_test.dart with 9 tests covering:
  - buildLoadingScaffold(): structure, loading indicator, app bar
  - buildHomeLeadingButton(): widget creation, semantics, tooltip
  - buildBreadcrumbTitle(): title display, text styles, overflow, theme colors
- Added canPopNavigation() test to test/utils/navigation_helpers_test.dart
- All 552 tests now passing

Test Results

✅ 552 tests passed
✅ All analyzer checks pass
✅ Golden files updated for consistent behavior

Original prompt

look for ways to simplify the code - reduce duplication

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Co-authored-by: richardthe3rd <573334+richardthe3rd@users.noreply.github.com>

Copilot

Pull request overview

This pull request removes unused go_router imports from brewery_screen.dart and style_screen.dart after refactoring common widget building patterns into reusable utility functions. The refactoring successfully reduces code duplication by extracting three common patterns: loading scaffolds, home navigation buttons, and breadcrumb-style titles.

Key changes:

Created widget_builders.dart with three reusable widget builders (buildLoadingScaffold, buildHomeLeadingButton, buildBreadcrumbTitle)
Added canPopNavigation helper to navigation_helpers.dart for safe navigation state checking
Replaced duplicated code in three screen files with calls to the new helper functions

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
`lib/utils/widget_builders.dart`	New file with three reusable widget builders for loading state, home button, and breadcrumb titles
`lib/utils/navigation_helpers.dart`	Added `canPopNavigation` function to safely check if navigation can pop
`lib/utils/utils.dart`	Exported new `widget_builders.dart` in barrel file
`lib/screens/brewery_screen.dart`	Removed unused `go_router` import and replaced duplicated widget code with helper function calls
`lib/screens/style_screen.dart`	Removed unused `go_router` import and replaced duplicated widget code with helper function calls
`lib/screens/drink_detail_screen.dart`	Replaced duplicated widget code with helper function calls (kept `go_router` import as it's still needed)

Copilot · 2026-01-08T23:01:43Z

+/// Common widget builders for reducing duplication across screens.
+///
+/// This file contains reusable widget builders that are used across multiple
+/// screens to maintain consistency and reduce code duplication.
+library;
+
+import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
+import 'navigation_helpers.dart';
+
+/// Builds a loading scaffold with standard appearance.
+///
+/// Used when data is being fetched to show a consistent loading state
+/// across all screens.
+///
+/// Example:
+/// ```dart
+/// if (provider.isLoading) {
+///   return buildLoadingScaffold();
+/// }
+/// ```
+Widget buildLoadingScaffold() {
+  return Scaffold(
+    appBar: AppBar(title: const Text('Loading...')),
+    body: const Center(child: CircularProgressIndicator()),
+  );
+}
+
+/// Builds a home button for the AppBar leading position.
+///
+/// Shows a home button instead of the back button when navigation cannot pop.
+/// This ensures users can always navigate back to the festival home.
+///
+/// The [festivalId] is used to navigate to the correct festival home page.
+///
+/// Example:
+/// ```dart
+/// AppBar(
+///   leading: buildHomeLeadingButton(context, festivalId),
+/// )
+/// ```
+Widget? buildHomeLeadingButton(BuildContext context, String festivalId) {
+  if (canPopNavigation(context)) {
+    return null; // Use default back button
+  }
+
+  return Semantics(
+    label: 'Go to home screen',
+    hint: 'Double tap to return to drinks list',
+    button: true,
+    child: IconButton(
+      icon: const Icon(Icons.home),
+      onPressed: () => context.go(buildFestivalHome(festivalId)),
+      tooltip: 'Home',
+    ),
+  );
+}
+
+/// Builds a breadcrumb-style title for the AppBar.
+///
+/// Shows a primary title with the festival name as a subtitle for context.
+/// This provides consistent navigation breadcrumbs across detail screens.
+///
+/// The [title] is the main heading (e.g., brewery name, style name, drink name).
+/// The [festivalName] appears as a smaller subtitle below the title.
+///
+/// Example:
+/// ```dart
+/// AppBar(
+///   title: buildBreadcrumbTitle(
+///     context,
+///     title: 'IPA',
+///     festivalName: 'Cambridge Beer Festival 2025',
+///   ),
+/// )
+/// ```
+Widget buildBreadcrumbTitle(
+  BuildContext context, {
+  required String title,
+  required String festivalName,
+}) {
+  final theme = Theme.of(context);
+
+  return Column(
+    mainAxisSize: MainAxisSize.min,
+    crossAxisAlignment: CrossAxisAlignment.start,
+    children: [
+      Text(
+        title,
+        style: theme.textTheme.titleLarge,
+        overflow: TextOverflow.ellipsis,
+      ),
+      Text(
+        festivalName,
+        style: theme.textTheme.bodySmall?.copyWith(
+          color: theme.colorScheme.onSurfaceVariant,
+        ),
+        overflow: TextOverflow.ellipsis,
+      ),
+    ],
+  );
+}


The new widget builder functions (buildLoadingScaffold, buildHomeLeadingButton, and buildBreadcrumbTitle) lack test coverage. Other utility functions in the codebase (e.g., navigation_helpers.dart) have comprehensive unit tests. Consider adding tests to verify the widget structure, semantics labels, and interaction behaviors, especially for buildHomeLeadingButton which has conditional logic and navigation behavior.

Added comprehensive test coverage for widget_builders.dart in commit de783f8. The tests verify:

buildLoadingScaffold(): widget structure, loading indicator, app bar title

buildHomeLeadingButton(): widget creation, semantics labels, tooltip, navigation behavior

buildBreadcrumbTitle(): title/subtitle display, text styles, overflow handling, theme colors

All tests pass (552/552).

Copilot · 2026-01-08T23:01:43Z

+bool canPopNavigation(BuildContext context) {
+  try {
+    return GoRouter.of(context).canPop();
+  } catch (e) {
+    // GoRouter not available (e.g., in tests)
+    return false;
+  }
+}


The new canPopNavigation function lacks test coverage. Other navigation helper functions in this file have comprehensive unit tests. Consider adding tests to verify the function returns true when GoRouter.canPop() is true, returns false when GoRouter.canPop() is false, and handles the case where GoRouter is not available (e.g., returns false and doesn't throw).

Added test coverage for canPopNavigation() in commit de783f8. The test verifies it returns false when GoRouter is not available (e.g., in test environment without router setup). All tests pass (552/552).

richardthe3rd · 2026-01-09T08:33:00Z

@copilot test failed after this change. Investigate, run tests locally

Co-authored-by: richardthe3rd <573334+richardthe3rd@users.noreply.github.com>

Copilot · 2026-01-09T08:48:32Z

@copilot test failed after this change. Investigate, run tests locally

Fixed in commit de783f8. The test failures were golden file mismatches in drink_detail_screen_screenshot_test.dart.

Root cause: The old _canPop() method in drink_detail_screen returned true when GoRouter was unavailable (inconsistent), while brewery_screen and style_screen returned false. The refactored canPopNavigation() helper unified this to return false (correct behavior).

Fix: Updated golden files to reflect the correct behavior (home button shown in test environment). All 552 tests now pass.

github-actions · 2026-01-10T10:53:28Z

LCOV of commit `de783f8` during CI #27

Summary coverage rate:
  lines......: 77.5% (2228 of 2873 lines)
  functions..: no data found
  branches...: no data found

Files changed coverage rate:
                                                      |Lines       |Functions  |Branches    
  Filename                                            |Rate     Num|Rate    Num|Rate     Num
  ==========================================================================================
  lib/screens/brewery_screen.dart                     | 0.0%     65|    -     0|    -      0
  lib/screens/drink_detail_screen.dart                | 0.0%    182|    -     0|    -      0
  lib/screens/style_screen.dart                       | 0.0%     67|    -     0|    -      0
  lib/utils/navigation_helpers.dart                   | 0.0%     43|    -     0|    -      0
  lib/utils/widget_builders.dart                      | 0.0%     16|    -     0|    -      0

codecov · 2026-01-10T10:53:39Z

Codecov Report

❌ Patch coverage is 87.09677% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
lib/screens/brewery_screen.dart	80.00%	1 Missing ⚠️
lib/screens/drink_detail_screen.dart	50.00%	1 Missing ⚠️
lib/screens/style_screen.dart	80.00%	1 Missing ⚠️
lib/utils/widget_builders.dart	94.11%	1 Missing ⚠️

📢 Thoughts on this report? Let us know!

github-actions · 2026-01-10T10:58:13Z

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Initial plan

3f3d14c

Copilot AI assigned Copilot and richardthe3rd Jan 8, 2026

Copilot started work on behalf of richardthe3rd January 8, 2026 19:53 View session

Remove unused go_router imports from brewery and style screens

c8efc38

Co-authored-by: richardthe3rd <573334+richardthe3rd@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Refactor code to reduce duplication and simplify logic~~ Remove unused go_router imports Jan 8, 2026

Copilot AI requested a review from richardthe3rd January 8, 2026 20:12

Copilot finished work on behalf of richardthe3rd January 8, 2026 20:12

richardthe3rd marked this pull request as ready for review January 8, 2026 22:58

Copilot AI review requested due to automatic review settings January 8, 2026 22:58

Copilot started reviewing on behalf of richardthe3rd January 8, 2026 22:58 View session

Copilot AI reviewed Jan 8, 2026

View reviewed changes

Copilot started work on behalf of richardthe3rd January 9, 2026 08:33 View session

Add tests for widget_builders and canPopNavigation, update golden files

de783f8

Co-authored-by: richardthe3rd <573334+richardthe3rd@users.noreply.github.com>

Copilot finished work on behalf of richardthe3rd January 9, 2026 08:49

richardthe3rd merged commit f14d73c into main Jan 10, 2026
10 checks passed

richardthe3rd deleted the copilot/simplify-code-reduce-duplication branch January 10, 2026 16:16

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Remove unused go_router imports - #206

Remove unused go_router imports#206
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Code Simplification - Reduce Duplication

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LCOV of commit de783f8 during CI #27

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Copilot AI commented Jan 8, 2026 •

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LCOV of commit `de783f8` during CI #27