Inboxintel/tests/InboxIntel.UnitTests/EmbeddingProviderTests.cs

using FluentAssertions;
using InboxIntel.Infrastructure.Ai;
using Xunit;

namespace InboxIntel.UnitTests;

/// <summary>
/// The Null embedding provider is the AI-off / no-model path. Semantic features must be able
/// to detect unavailability (IsAvailable=false) and fall back to lexical search — this locks
/// that contract so "AI is never required" can't silently regress.
/// </summary>
public class EmbeddingProviderTests
{
    [Fact]
    public async Task Null_provider_reports_unavailable_and_returns_empty_vectors()
    {
        var sut = new NullEmbeddingProvider();

        sut.IsAvailable.Should().BeFalse();
        (await sut.EmbedAsync("anything")).Should().BeEmpty();
        (await sut.EmbedBatchAsync(new[] { "a", "b" })).Should().BeEmpty();
    }
}