feat(application): IAvisoQueryRepository + NullAvisoQueryRepository (CAT-002)

tests/SIGCM2.Application.Tests/Avisos/NullAvisoQueryRepositoryTests.cs

@@ -0,0 +1,35 @@
+using FluentAssertions;
+using SIGCM2.Application.Avisos;
+
+namespace SIGCM2.Application.Tests.Avisos;
+
+public class NullAvisoQueryRepositoryTests
+{
+    private readonly NullAvisoQueryRepository _repo = new();
+
+    [Fact]
+    public async Task CountAvisosEnRubroAsync_Always_ReturnsZero()
+    {
+        var result = await _repo.CountAvisosEnRubroAsync(rubroId: 99);
+
+        result.Should().Be(0);
+    }
+
+    [Fact]
+    public async Task CountAvisosBatchAsync_WithIds_ReturnsDictionaryAllZero()
+    {
+        var result = await _repo.CountAvisosBatchAsync([1, 2, 3]);
+
+        result.GetValueOrDefault(1, 0).Should().Be(0);
+        result.GetValueOrDefault(2, 0).Should().Be(0);
+        result.GetValueOrDefault(3, 0).Should().Be(0);
+    }
+
+    [Fact]
+    public async Task CountAvisosBatchAsync_EmptyIds_ReturnsEmptyDictionary()
+    {
+        var result = await _repo.CountAvisosBatchAsync([]);
+
+        result.Should().HaveCount(0);
+    }
+}