# Testing Strategy

The test project uses xUnit for the framework, Shouldly for assertions, and NSubstitute for mocking.

## Project Structure

```
tests/
├── JdeScoping.Tests/
│   ├── Unit/
│   │   ├── Services/
│   │   │   ├── SearchServiceTests.cs
│   │   │   ├── ExcelExportServiceTests.cs
│   │   │   └── DataSyncOrchestratorTests.cs
│   │   ├── Repositories/
│   │   │   └── SearchRepositoryTests.cs
│   │   └── Models/
│   │       └── SearchCriteriaTests.cs
│   └── Integration/
│       ├── ApiTests/
│       │   ├── SearchControllerTests.cs
│       │   └── LookupControllerTests.cs
│       └── RepositoryTests/
│           └── JdeRepositoryTests.cs
├── JdeScoping.Api.IntegrationTests/
│   └── ... (API integration tests)
└── JdeScoping.Database.Tests/
    ├── Infrastructure/
    │   └── DatabaseTestBase.cs
    ├── Functions/
    │   ├── ScalarFunctionTests.cs
    │   ├── SimpleTableFunctionTests.cs
    │   └── ComplexTableFunctionTests.cs
    └── Procedures/
        └── ValidateSearchCriteriaProcedureTests.cs
```

## Unit Tests

Unit tests mock dependencies and test business logic in isolation:

```csharp
public class SearchServiceTests
{
    [Fact]
    public async Task ExecuteSearch_WithValidCriteria_ReturnsResults()
    {
        // Arrange
        var mockRepo = Substitute.For<ISearchRepository>();
        mockRepo.GetWorkOrdersAsync(Arg.Any<SearchCriteria>())
            .Returns(new List<WorkOrder> { new WorkOrder { Number = "WO123" } });

        var service = new SearchService(mockRepo);
        var criteria = new SearchCriteria { ItemNumber = "ABC123" };

        // Act
        var results = await service.ExecuteAsync(criteria);

        // Assert
        results.Count.ShouldBeGreaterThan(0);
        results.First().Number.ShouldBe("WO123");
    }

    [Fact]
    public async Task ExecuteSearch_WithInvalidCriteria_ThrowsValidationException()
    {
        // Arrange
        var mockRepo = Substitute.For<ISearchRepository>();
        var service = new SearchService(mockRepo);
        var criteria = new SearchCriteria(); // Empty criteria

        // Act & Assert
        await Should.ThrowAsync<ValidationException>(
            () => service.ExecuteAsync(criteria));
    }
}
```

## Shouldly Assertions

Shouldly provides readable assertion syntax without FluentAssertions licensing:

```csharp
// Value assertions
result.ShouldBe(expected);
result.ShouldNotBeNull();
result.ShouldBeGreaterThan(0);

// Collection assertions
list.ShouldContain(item);
list.ShouldBeEmpty();
list.Count.ShouldBe(5);

// String assertions
text.ShouldStartWith("Error");
text.ShouldContain("expected");

// Exception assertions
Should.Throw<ArgumentException>(() => service.Process(null));
await Should.ThrowAsync<InvalidOperationException>(() => service.ProcessAsync());
```

## NSubstitute Mocking

NSubstitute provides a simple API for creating test doubles:

```csharp
// Create substitute
var mockRepo = Substitute.For<ISearchRepository>();

// Configure returns
mockRepo.GetByIdAsync(123).Returns(new Search { Id = 123 });
mockRepo.GetByIdAsync(Arg.Any<int>()).Returns(x => new Search { Id = (int)x[0] });

// Verify calls
await mockRepo.Received().CreateAsync(Arg.Is<Search>(s => s.Status == "Queued"));
await mockRepo.DidNotReceive().DeleteAsync(Arg.Any<int>());
```

## Integration Tests

Integration tests use `WebApplicationFactory<Program>` for API tests:

```csharp
public class SearchControllerTests : IClassFixture<WebApplicationFactory<Program>>
{
    private readonly HttpClient _client;

    public SearchControllerTests(WebApplicationFactory<Program> factory)
    {
        _client = factory.CreateClient();
    }

    [Fact]
    public async Task SubmitSearch_ReturnsSearchId()
    {
        // Arrange
        var criteria = new SearchCriteria { ItemNumber = "TEST123" };
        var content = new StringContent(
            JsonSerializer.Serialize(criteria),
            Encoding.UTF8,
            "application/json");

        // Act
        var response = await _client.PostAsync("/api/search", content);

        // Assert
        response.StatusCode.ShouldBe(HttpStatusCode.OK);
        var result = await response.Content.ReadFromJsonAsync<SearchResult>();
        result.SearchId.ShouldBeGreaterThan(0);
    }
}
```

## Database Integration Tests

Repository integration tests run against a local SQL Server instance:

```csharp
public class SearchRepositoryIntegrationTests : IDisposable
{
    private readonly string _connectionString;

    public SearchRepositoryIntegrationTests()
    {
        _connectionString = "Server=localhost;Database=LotFinder_Test;...";
        // Setup test database
    }

    [Fact]
    public async Task CreateAndRetrieve_RoundTrips()
    {
        var repo = new SearchRepository(_connectionString);
        var search = new Search { UserId = "testuser", Status = "Queued" };

        var id = await repo.CreateAsync(search);
        var retrieved = await repo.GetByIdAsync(id);

        retrieved.ShouldNotBeNull();
        retrieved.UserId.ShouldBe("testuser");
    }

    public void Dispose()
    {
        // Cleanup test data
    }
}
```

## Database Tests

The `JdeScoping.Database.Tests` project tests SQL functions and stored procedures against a live SQL Server instance.

### Test Infrastructure

Tests inherit from `DatabaseTestBase` which provides:
- Connection management via `DatabaseTestFixture`
- Automatic test data cleanup
- Helper methods for inserting test searches

```csharp
[Collection("DatabaseTests")]
public class ScalarFunctionTests : DatabaseTestBase
{
    [Fact]
    public async Task fn_GetSearchMinimumDt_ValidSearch_ReturnsDateTime()
    {
        // Arrange
        var criteria = new SearchCriteria { MinimumDt = new DateTime(2024, 6, 15) };
        var searchId = await InsertTestSearchAsync(criteria);

        // Act
        var result = await Connection.QuerySingleOrDefaultAsync<DateTime?>(
            "SELECT dbo.fn_GetSearchMinimumDt(@SearchId)",
            new { SearchId = searchId });

        // Assert
        result.Should().BeCloseTo(criteria.MinimumDt.Value, TimeSpan.FromSeconds(1));
    }
}
```

### Test Categories

| Category | Tests | Description |
|----------|-------|-------------|
| Scalar Functions | 15 | Test `fn_GetSearchMinimumDt`, `fn_GetSearchMaximumDt`, `fn_GetSearchExtractMisData` |
| Simple Table Functions | 38 | Test array extraction for work orders, items, profit centers, work centers, operators |
| Complex Table Functions | 23 | Test object extraction for component lots and part operations |
| Validation Procedure | 6 | Test `usp_ValidateSearchCriteria` error handling |

**Total: 82 database tests**

### Running Database Tests

```bash
# Run all database tests
dotnet test tests/JdeScoping.Database.Tests

# Run specific test class
dotnet test tests/JdeScoping.Database.Tests --filter "FullyQualifiedName~ScalarFunctionTests"
```

**Prerequisites**: SQL Server must be running on localhost:1434 with the ScopingTool database.

## Related Documentation

- [Core Project](./CoreProject.md)
- [Dependencies](./Dependencies.md)
- [Database](./Database.md)