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Choose the test layer that matches the behavior
Flutter documents three test layers: unit, widget, and integration. They differ in scope, confidence, setup burden, maintenance cost, and speed—not in a fixed percentage every project should follow. Flutter describes unit tests as the fastest and least dependency-heavy; widget tests provide more confidence with additional setup; integration tests provide the most confidence but are slowest and cost the most to maintain.
| Behavior to check | Best starting layer | Examples |
|---|---|---|
| Puzzle rules and state changes | Unit | Move legality, board transitions, scoring, win detection, reset, and undo |
| Visible board and input feedback | Widget | Tile contents, selection, invalid-move feedback, completion message, and disabled controls |
| App wiring and complete journeys | Integration | Launch, enter a level, make moves, finish or reset, and verify saved state |
| Native plugin communication | Integration for the boundary; mocks or fakes below | Storage, haptics, audio, or another platform-channel feature |
This is a practical mapping, not a rule that every behavior can only be tested at one layer. Keep the core rules inexpensive to exercise, then add higher-level checks where UI wiring or platform behavior could fail. See Flutter’s testing overview for the documented tradeoffs.
Start with deterministic unit tests for puzzle rules
A unit test targets one function, method, or class under different conditions. Model the board and rule engine separately from widgets where practical, so tests can pass a board state and action directly and inspect the result. Flutter’s Dart test package supplies the core test framework, while flutter_test adds Flutter-specific utilities. Tests commonly live in test/ and use the _test.dart suffix. See the unit testing recipe.
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For each rule, write cases as state/action/result examples. Assert the full resulting state—not only a score or a win flag—so an unexpected change to other cells or fields is caught too. A useful coverage matrix for a puzzle game is:
| Rule or feature | Cases to include |
|---|---|
| Move legality and board transition | Legal move; illegal move; occupied or out-of-range cell; no-op; repeated action; smallest supported board |
| Goal or win detection | One move before the goal; exact goal state; each applicable winning pattern; board already complete |
| Scoring, undo, and reset | Zero score; score boundary; undo at the initial state; reset after partial progress; repeated reset |
| Randomized puzzle generation | Seeded or injected deterministic source; required invariants; solvability if required; empty candidate set or generation failure |
These are recommended test-design examples; Flutter does not prescribe puzzle-specific cases. Adapt them to the game’s actual rules. For randomized logic, inject a deterministic source so a test does not pass or fail based on a lucky draw. Include the smallest supported board and boundary coordinates explicitly: otherwise index errors and assumptions about board size can remain hidden behind typical gameplay.
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Cover normal, boundary, invalid, and terminal states
For every action, ask what happens at the edges of its valid inputs, after it has already happened, and when the game can no longer continue. A compact way to organize cases is to enumerate the state before the action, the action itself, and the expected state afterward.
- Normal: a legal move on a partially played board produces the expected transition.
- Boundary: the smallest supported board, lowest and highest valid coordinates, and a score or move count at its limit behave as defined.
- Invalid: an occupied destination, illegal move, out-of-range position, or action that is not available leaves the state in the expected condition.
- Repeated: applying the same action twice or resetting twice does not create unintended changes.
- Terminal: test the state immediately before victory, the exact winning state, and an already-completed board. Confirm whether further actions are rejected, ignored, or intentionally allowed.
- Recovery: undo at the initial state and reset after partial progress produce the documented initial state.
Do not assume how an invalid action should behave: encode the game’s intended contract, whether that is rejection, no state change, or visible feedback. Testing the entire state makes that contract precise.
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Use widget tests to verify the board contract
A widget test checks a widget under Flutter’s test lifecycle. With testWidgets and WidgetTester, build a board, perform an input, pump the resulting frame, and assert what the player can see. Finders and matchers can check for a widget’s presence, absence, or count. The widget testing recipe explains the test tools and workflow.
Useful board states to render include an empty board, a partially played board, and a completed board. For interactions, verify selection or highlighting, legal-move feedback, disabled controls, and the completion message after the relevant action. Exercise the input method the game actually supports—tap, drag, or keyboard—and include repeated input if it could expose a state or feedback bug.
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If the app provides accessibility semantics, check that important cells and controls expose the expected labels and states. A golden test can compare rendered output with a reference image when visual composition itself is part of the contract. Use it selectively: a golden is useful when rendering is stable enough to maintain, not as a replacement for assertions about game rules.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Use integration tests for a few complete journeys
Integration tests exercise a complete app or a large part of it on a target device or emulator, with documented routes for supported desktop and browser targets. They are appropriate when the question is whether the pieces work together—for example, whether the app starts, opens a level, accepts moves, reaches a terminal screen, and restarts or restores state. Flutter’s integration testing concepts describe this scope.
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- Choose one important player journey, such as launch, start a level, make a legal move, and reach a completed state.
- Include reset or state restoration if that behavior crosses app components or persistence boundaries.
- Run the test with the project’s configured SDK and target. Flutter’s documentation gives
flutter test integration_test/app_test.dartas an example command; confirm it fits the project and pinned Flutter SDK.
Flutter’s integration_test package cannot operate native platform UI such as permission dialogs. If a journey depends on such a dialog, use another approach or a framework that supports native UI interaction rather than treating the dialog as an ordinary Flutter widget.
Keep plugins behind a testable boundary
Ordinary Dart unit and widget tests do not load a plugin’s native host implementation. A direct plugin call can therefore fail with MissingPluginException, even when the same feature works in the running app. Flutter explains this limitation in its guidance on plugins in Flutter tests.
For puzzle logic and widget tests, put plugin calls—such as storage, haptics, or audio—behind an app-owned interface and inject a fake or controlled double. This keeps rule tests independent of platform code and lets widget tests verify the app’s response without requiring a device service. When the Dart-to-native communication itself matters, cover that boundary with an integration test; native-only behavior may also require native tests.
Build a maintainable suite without an arbitrary test quota
Prefer many fast, focused checks of rules and board behavior, backed by enough integration coverage for the journeys and platform boundaries that matter. Flutter’s guidance is qualitative: it does not establish a universal test ratio, fixed test count, or coverage target. Choose cases based on the game’s rules and the ways its components can fail.
Quick Recap
- Keep rule inputs and expected state transitions explicit.
- Make randomized behavior deterministic in tests.
- Test visible feedback separately from the underlying rule result.
- Use integration tests where app wiring, persistence, lifecycle, or native communication adds meaningful risk.
- Keep plugin dependencies out of lower-level tests unless they are deliberately controlled.
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