[#16] Unit tests

Signed-off-by: Pavel Gross <p.gross@yadro.com>

src/FrostFS.SDK.Tests/Mocks/ContainerServiceMocks/ContainerStub.cs

@@ -0,0 +1,12 @@
+using FrostFS.Container;
+using Moq;
+
+namespace FrostFS.SDK.Tests;
+
+public class ContainerStub(string key) : ContainerServiceBase(key)
+{
+    public override Mock<ContainerService.ContainerServiceClient> GetMock()
+    {
+        return new Mock<ContainerService.ContainerServiceClient>();
+    }
+}