test: add GlobalInstanceTable tests

Packages/com.github.homuler.mediapipe/Tests/EditMode/Util/GlobalInstanceTableTest.cs

@@ -0,0 +1,218 @@
+// Copyright (c) 2023 homuler
+//
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT.
+
+using System;
+using NUnit.Framework;
+
+namespace Mediapipe.Tests.Util
+{
+  public class GlobalInstanceTableTest
+  {
+    private class Value
+    {
+      public readonly int value;
+
+      public Value(int value)
+      {
+        this.value = value;
+      }
+    }
+
+    #region Constructor
+    [Test]
+    public void Ctor_Throws_WhenMaxSizeIsLessThenZero() => Assert.Throws<ArgumentException>(() => new GlobalInstanceTable<int, Value>(-1));
+
+    [Test]
+    public void Ctor_InstantiateAnEmptyTable_WhenMaxSizeIsZero()
+    {
+      var table = new GlobalInstanceTable<int, Value>();
+      Assert.AreEqual(0, table.maxSize);
+    }
+
+    [Test]
+    public void Ctor_InstantiateAnEmptyTable_WhenMaxSizeIsSpecified()
+    {
+      var table = new GlobalInstanceTable<int, Value>(10);
+      Assert.AreEqual(10, table.maxSize);
+    }
+    #endregion
+
+    #region maxSize
+    [Test]
+    public void MaxSize_MustBeLargerThanZero()
+    {
+      var table = new GlobalInstanceTable<int, Value>(10);
+      Assert.Throws<ArgumentException>(() => table.maxSize = -1);
+    }
+
+    [Test]
+    public void MaxSize_CanBeChangedToLargerValue()
+    {
+      var table = new GlobalInstanceTable<int, Value>(5);
+      Assert.AreEqual(5, table.maxSize);
+
+      table.maxSize = 6;
+      Assert.AreEqual(6, table.maxSize);
+    }
+
+    [Test]
+    public void MaxSize_CanBeChangedToSmallerValue()
+    {
+      var table = new GlobalInstanceTable<int, Value>(5);
+      Assert.AreEqual(5, table.maxSize);
+
+      table.Add(1, new Value(1));
+      table.Add(2, new Value(2));
+      table.Add(3, new Value(3));
+      table.Add(4, new Value(4));
+      table.Add(5, new Value(5));
+
+      table.maxSize = 2;
+      Assert.AreEqual(2, table.maxSize);
+      Assert.AreEqual(5, table.count);
+    }
+    #endregion
+
+    #region Add
+    [Test]
+    public void CannotAdd_IfCountEqualsMaxSize()
+    {
+      var table = new GlobalInstanceTable<int, Value>(1);
+      var v1 = new Value(1);
+
+      table.Add(1, v1);
+      Assert.Throws<InvalidOperationException>(() => table.Add(2, new Value(2)));
+
+      GC.KeepAlive(v1);
+    }
+
+    [Test]
+    public void CanAdd_IfCountEqualsMaxSize_But_SomeValuesAreGCed()
+    {
+      var table = new GlobalInstanceTable<int, Value>(1);
+
+      table.Add(1, new Value(1));
+      GC.Collect();
+
+      Assert.DoesNotThrow(() => table.Add(2, new Value(2)));
+    }
+
+    [Test]
+    public void CannotAdd_If_KeyAlreadyExists()
+    {
+      var table = new GlobalInstanceTable<int, Value>(2);
+      var v1 = new Value(1);
+
+      table.Add(1, v1);
+      Assert.Throws<ArgumentException>(() => table.Add(1, new Value(2)));
+
+      GC.KeepAlive(v1);
+    }
+
+    [Test]
+    public void CanAdd_If_KeyAlreadyExists_But_TheReferenceIsGCed()
+    {
+      var table = new GlobalInstanceTable<int, Value>(2);
+
+      table.Add(1, new Value(1));
+      GC.Collect();
+
+      Assert.DoesNotThrow(() => table.Add(1, new Value(2)));
+    }
+    #endregion
+
+    #region TryGetValue
+    [Test]
+    public void TryGetValue_ReturnsTrue_IfTheKeyExists()
+    {
+      var table = new GlobalInstanceTable<int, Value>(1);
+      var v1 = new Value(1);
+
+      table.Add(1, v1);
+      Assert.IsTrue(table.TryGetValue(1, out var v2));
+      Assert.AreEqual(v1, v2);
+
+      GC.KeepAlive(v1);
+    }
+
+    [Test]
+    public void TryGetValue_ReturnsFalse_IfTheKeyExists_But_TheValueIsGCed()
+    {
+      var table = new GlobalInstanceTable<int, Value>(1);
+
+      table.Add(1, new Value(1));
+      GC.Collect();
+
+      Assert.IsFalse(table.TryGetValue(1, out var _));
+    }
+
+    [Test]
+    public void TryGetValue_ReturnsFalse_IfTheKeyDoesNotExist()
+    {
+      var table = new GlobalInstanceTable<int, Value>(1);
+      Assert.IsFalse(table.TryGetValue(1, out var _));
+    }
+    #endregion
+
+    #region Clear
+    [Test]
+    public void Clear_ClearsTheTable()
+    {
+      var table = new GlobalInstanceTable<int, Value>(2);
+      var v1 = new Value(1);
+      var v2 = new Value(2);
+
+      table.Add(1, v1);
+      table.Add(2, v2);
+      Assert.AreEqual(2, table.count);
+
+      table.Clear();
+      Assert.AreEqual(0, table.count);
+
+      GC.KeepAlive(v1);
+      GC.KeepAlive(v2);
+    }
+    #endregion
+
+    #region ContainsKey
+    [Test]
+    public void ContainsKey_ReturnsTrue_IfTheKeyExists()
+    {
+      var table = new GlobalInstanceTable<int, Value>(1);
+      table.Add(1, new Value(1));
+
+      GC.Collect();
+      Assert.IsTrue(table.ContainsKey(1));
+      Assert.False(table.TryGetValue(1, out var _));
+    }
+
+    [Test]
+    public void ContainsKey_ReturnsFalse_IfTheKyeDoesNotExist()
+    {
+      var table = new GlobalInstanceTable<int, Value>(1);
+      Assert.IsFalse(table.ContainsKey(1));
+    }
+    #endregion
+
+    #region Remove
+    [Test]
+    public void Remove_RemovesTheKeyFromTheTable()
+    {
+      var table = new GlobalInstanceTable<int, Value>(1);
+      var v1 = new Value(1);
+
+      table.Add(1, v1);
+      Assert.AreEqual(1, table.count);
+
+      table.Remove(1);
+      Assert.IsFalse(table.ContainsKey(1));
+      Assert.AreEqual(0, table.count);
+
+      GC.KeepAlive(v1);
+    }
+    #endregion
+  }
+}