chore: import upstream snapshot with attribution

dotnet/test/VectorData/MongoDB.UnitTests/MongoVectorStoreTests.cs

@@ -0,0 +1,73 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.SemanticKernel.Connectors.MongoDB;
+using MongoDB.Driver;
+using Moq;
+using Xunit;
+
+namespace SemanticKernel.Connectors.MongoDB.UnitTests;
+
+/// <summary>
+/// Unit tests for <see cref="MongoVectorStore"/> class.
+/// </summary>
+public sealed class MongoVectorStoreTests
+{
+    private readonly Mock<IMongoDatabase> _mockMongoDatabase = new();
+
+    [Fact]
+    public void GetCollectionWithNotSupportedKeyThrowsException()
+    {
+        // Arrange
+        using var sut = new MongoVectorStore(this._mockMongoDatabase.Object);
+
+        // Act & Assert
+        Assert.Throws<NotSupportedException>(() => sut.GetCollection<byte[], MongoHotelModel>("collection"));
+    }
+
+    [Fact]
+    public void GetCollectionWithoutFactoryReturnsDefaultCollection()
+    {
+        // Arrange
+        using var sut = new MongoVectorStore(this._mockMongoDatabase.Object);
+
+        // Act
+        var collection = sut.GetCollection<string, MongoHotelModel>("collection");
+
+        // Assert
+        Assert.NotNull(collection);
+    }
+
+    [Fact]
+    public async Task ListCollectionNamesReturnsCollectionNamesAsync()
+    {
+        // Arrange
+        var expectedCollectionNames = new List<string> { "collection-1", "collection-2", "collection-3" };
+
+        var mockCursor = new Mock<IAsyncCursor<string>>();
+        mockCursor
+            .SetupSequence(l => l.MoveNextAsync(It.IsAny<CancellationToken>()))
+            .ReturnsAsync(true)
+            .ReturnsAsync(false);
+
+        mockCursor
+            .Setup(l => l.Current)
+            .Returns(expectedCollectionNames);
+
+        this._mockMongoDatabase
+            .Setup(l => l.ListCollectionNamesAsync(It.IsAny<ListCollectionNamesOptions>(), It.IsAny<CancellationToken>()))
+            .ReturnsAsync(mockCursor.Object);
+
+        using var sut = new MongoVectorStore(this._mockMongoDatabase.Object);
+
+        // Act
+        var actualCollectionNames = await sut.ListCollectionNamesAsync().ToListAsync();
+
+        // Assert
+        Assert.Equal(expectedCollectionNames, actualCollectionNames);
+    }
+}