Killed history

Nadeko.Tests/GroupGreetTests.cs

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+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using NadekoBot.Core.Services;
+using NUnit.Framework;
+
+namespace Nadeko.Tests
+{
+    public class GroupGreetTests
+    {
+        private GreetGrouper<int> _grouper;
+
+        [SetUp]
+        public void Setup()
+        {
+            _grouper = new GreetGrouper<int>();
+        }
+
+        [Test]
+        public void CreateTest()
+        {
+            var created = _grouper.CreateOrAdd(0, 5);
+            
+            Assert.True(created);
+        }
+        
+        [Test]
+        public void CreateClearTest()
+        {
+            _grouper.CreateOrAdd(0, 5);
+            _grouper.ClearGroup(0, 5, out var items);
+
+            Assert.AreEqual(0, items.Count());
+        }
+        
+        [Test]
+        public void NotCreatedTest()
+        {
+            _grouper.CreateOrAdd(0, 5);
+            var created = _grouper.CreateOrAdd(0, 4);
+            
+            Assert.False(created);
+        }
+        
+        [Test]
+        public void ClearAddedTest()
+        {
+            _grouper.CreateOrAdd(0, 5);
+            _grouper.CreateOrAdd(0, 4);
+            _grouper.ClearGroup(0, 5, out var items);
+
+            var list = items.ToList();
+            
+            Assert.AreEqual(1, list.Count, $"Count was {list.Count}");
+            Assert.AreEqual(4, list[0]);
+        }
+
+        [Test]
+        public async Task ClearManyTest()
+        {
+            _grouper.CreateOrAdd(0, 5);
+            
+            // add 15 items
+            await Task.WhenAll(Enumerable.Range(10, 15)
+                .Select(x => Task.Run(() => _grouper.CreateOrAdd(0, x))));
+            
+            // get 5 at most
+            _grouper.ClearGroup(0, 5, out var items);
+            var list = items.ToList();
+            Assert.AreEqual(5, list.Count, $"Count was {list.Count}");
+
+            // try to get 15, but there should be 10 left
+            _grouper.ClearGroup(0, 15, out items);
+            list = items.ToList();
+            Assert.AreEqual(10, list.Count, $"Count was {list.Count}");
+        }
+    }
+}