Add project files.

test/unit/Elsa.MongoDb.UnitTests/Elsa.MongoDb.UnitTests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net9.0</TargetFramework>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\..\..\src\modules\Elsa.MongoDb\Elsa.MongoDb.csproj" />
+    </ItemGroup>
+</Project>

test/unit/Elsa.MongoDb.UnitTests/MongoKeyValueStoreTests.cs

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+using Elsa.Common.Multitenancy;
+using Elsa.KeyValues.Entities;
+using Elsa.MongoDb.Common;
+using Elsa.MongoDb.Modules.Runtime;
+using MongoDB.Driver;
+using NSubstitute;
+
+namespace Elsa.MongoDb.UnitTests;
+
+public class MongoKeyValueStoreTests
+{
+    private readonly MongoDbStore<SerializedKeyValuePair> _mongoDbStore;
+
+    public MongoKeyValueStoreTests()
+    {
+        var mongoCollectionMock = Substitute.For<IMongoCollection<SerializedKeyValuePair>>();
+        var tenantAccessorMock = Substitute.For<ITenantAccessor>();
+        mongoCollectionMock.FindOneAndReplaceAsync(
+                Arg.Any<FilterDefinition<SerializedKeyValuePair>>(),
+                Arg.Any<SerializedKeyValuePair>(),
+                Arg.Any<FindOneAndReplaceOptions<SerializedKeyValuePair>>()
+            )
+            .Returns(new SerializedKeyValuePair());
+        _mongoDbStore = new MongoDbStore<SerializedKeyValuePair>(mongoCollectionMock, tenantAccessorMock);
+    }
+
+    [Fact(DisplayName = "When saving a SerializedKeyValuePair document, don't throw an exception of missing ID property")]
+    public async Task SaveAsync_WithSerializedKeyValuePairDocument_DoesNotThrowException()
+    {
+        var mongoKeyValueStore = new MongoKeyValueStore(_mongoDbStore);
+        var keyValuePair = new SerializedKeyValuePair();
+
+        var exception = await Record.ExceptionAsync(
+            async () => await mongoKeyValueStore.SaveAsync(keyValuePair, default));
+
+        Assert.Null(exception);
+    }
+}

test/unit/Elsa.MongoDb.UnitTests/Usings.cs

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+global using Xunit;