Added test counter.

framework/src/Volo.Abp.TestBase/Volo/Abp/Testing/Utils/ITestCounter.cs

@@ -0,0 +1,13 @@
+namespace Volo.Abp.Testing.Utils
+{
+    public interface ITestCounter
+    {
+        int Add(string name, int count);
+
+        int Decrement(string name);
+
+        int Increment(string name);
+
+        int GetValue(string name);
+    }
+}

framework/src/Volo.Abp.TestBase/Volo/Abp/Testing/Utils/TestCounter.cs

@@ -0,0 +1,43 @@
+using System.Collections.Generic;
+using Volo.Abp.DependencyInjection;
+
+namespace Volo.Abp.Testing.Utils
+{
+    public class TestCounter : ITestCounter, ISingletonDependency
+    {
+        private readonly Dictionary<string, int> _values;
+
+        public TestCounter()
+        {
+            _values = new Dictionary<string, int>();
+        }
+
+        public int Increment(string name)
+        {
+            return Add(name, 1);
+        }
+
+        public int Decrement(string name)
+        {
+            return Add(name, -1);
+        }
+
+        public int Add(string name, int count)
+        {
+            lock (_values)
+            {
+                var newValue = _values.GetOrDefault(name) + count;
+                _values[name] = newValue;
+                return newValue;
+            }
+        }
+
+        public int GetValue(string name)
+        {
+            lock (_values)
+            {
+                return _values.GetOrDefault(name);
+            }
+        }
+    }
+}