Playwright-Dotnet

# Playwright .NET Test Generation Instructions

Test Writing Guidelines

Code Quality Standards

- **Locators**: Prioritize user-facing, role-based locators (`GetByRole`, `GetByLabel`, `GetByText`, etc.) for resilience and accessibility. Use `await Test.StepAsync()` to group interactions and improve test readability and reporting.

- **Assertions**: Use auto-retrying web-first assertions. These assertions use `Expect()` from Playwright assertions (e.g., `await Expect(locator).ToHaveTextAsync()`). Avoid checking visibility unless specifically testing for visibility changes.

- **Timeouts**: Rely on Playwright's built-in auto-waiting mechanisms. Avoid hard-coded waits or increased default timeouts.

- **Clarity**: Use descriptive test and step titles that clearly state the intent. Add comments only to explain complex logic or non-obvious interactions.

Test Structure

- **Usings**: Start with `using Microsoft.Playwright;` and either `using Microsoft.Playwright.Xunit;` or `using Microsoft.Playwright.NUnit;` or `using Microsoft.Playwright.MSTest;` for MSTest.

- **Organization**: Create test classes that inherit from `PageTest` (available in NUnit, xUnit, and MSTest packages) or use `IClassFixture<PlaywrightFixture>` for xUnit with custom fixtures. Group related tests for a feature in the same test class.

- **Setup**: Use `[SetUp]` (NUnit), `[TestInitialize]` (MSTest), or constructor initialization (xUnit) for setup actions common to all tests (e.g., navigating to a page).

- **Titles**: Use the appropriate test attribute (`[Test]` for NUnit, `[Fact]` for xUnit, `[TestMethod]` for MSTest) with descriptive method names following C# naming conventions (e.g., `SearchForMovieByTitle`).

File Organization

- **Location**: Store all test files in a `Tests/` directory or organize by feature.

- **Naming**: Use the convention `<FeatureOrPage>Tests.cs` (e.g., `LoginTests.cs`, `SearchTests.cs`).

- **Scope**: Aim for one test class per major application feature or page.

Assertion Best Practices

- **UI Structure**: Use `ToMatchAriaSnapshotAsync` to verify the accessibility tree structure of a component. This provides a comprehensive and accessible snapshot.

- **Element Counts**: Use `ToHaveCountAsync` to assert the number of elements found by a locator.

- **Text Content**: Use `ToHaveTextAsync` for exact text matches and `ToContainTextAsync` for partial matches.

- **Navigation**: Use `ToHaveURLAsync` to verify the page URL after an action.

Example Test Structure

using Microsoft.Playwright;
using Microsoft.Playwright.Xunit;
using static Microsoft.Playwright.Assertions;

namespace PlaywrightTests;

public class MovieSearchTests : PageTest
{
    public override async Task InitializeAsync()
    {
        await base.InitializeAsync();
        // Navigate to the application before each test
        await Page.GotoAsync("https://debs-obrien.github.io/playwright-movies-app");
    }

    [Fact]
    public async Task SearchForMovieByTitle()
    {
        await Test.StepAsync("Activate and perform search", async () =>
        {
            await Page.GetByRole(AriaRole.Search).ClickAsync();
            var searchInput = Page.GetByRole(AriaRole.Textbox, new() { Name = "Search Input" });
            await searchInput.FillAsync("Garfield");
            await searchInput.PressAsync("Enter");
        });

        await Test.StepAsync("Verify search results", async () =>
        {
            // Verify the accessibility tree of the search results
            await Expect(Page.GetByRole(AriaRole.Main)).ToMatchAriaSnapshotAsync(@"
                - main:
                  - heading ""Garfield"" [level=1]
                  - heading ""search results"" [level=2]
                  - list ""movies"":
                    - listitem ""movie"":
                      - link ""poster of The Garfield Movie The Garfield Movie rating"":
                        - /url: /playwright-movies-app/movie?id=tt5779228&page=1
                        - i