2 files changed, 1001 insertions, 0 deletions
diff --git a/Plugins/MonoGame.Extended/tests/MonoGame.Extended.Tests/Sprites/SpriteSheetAnimationTests.cs b/Plugins/MonoGame.Extended/tests/MonoGame.Extended.Tests/Sprites/SpriteSheetAnimationTests.cs
new file mode 100644
index 0000000..35ad3e3
--- /dev/null
+++ b/Plugins/MonoGame.Extended/tests/MonoGame.Extended.Tests/Sprites/SpriteSheetAnimationTests.cs
@@ -0,0 +1,910 @@
+using System;
+using Microsoft.Xna.Framework;
+using MonoGame.Extended.Sprites;
+using MonoGame.Extended.TextureAtlases;
+using Xunit;
+
+namespace MonoGame.Extended.Tests.Sprites
+{
+    public class SpriteSheetAnimationTests
+    {
+        [Theory]
+        [InlineData(0, 0)]
+        [InlineData(0, 0.9f)]
+        [InlineData(1, 1f)]
+        [InlineData(1, 1.9f)]
+        [InlineData(0, 2f)]
+        [InlineData(0, 2.9f)]
+        [InlineData(1, 3f)]
+        [InlineData(0, 4f)]
+        [InlineData(1, 5f)]
+        public void Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Not_Complete(int expectedTextureRegionIndex, float time)
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                true
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(time));
+
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[expectedTextureRegionIndex], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+        }
+
+        [Fact]
+        public void Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Not_Complete_Over_Multiple_Updates()
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                true
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(0));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+        }
+
+        [Theory]
+        [InlineData(0, 0.9f)]
+        [InlineData(1, 1f)]
+        [InlineData(1, 1.1f)]
+        [InlineData(1, 1.9f)]
+        public void Non_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Not_Complete(int expectedTextureRegionIndex, float time)
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                false
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(time));
+
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[expectedTextureRegionIndex], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+        }
+
+        [Theory]
+        [InlineData(1, 2f)]
+        [InlineData(1, 3f)]
+        [InlineData(1, 4f)]
+        public void Non_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Complete_When_AnimationDuration_Is_Reached(int expectedTextureRegionIndex, float time)
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                false
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(time));
+
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[expectedTextureRegionIndex], spriteSheetAnimation.CurrentFrame);
+            Assert.True(spriteSheetAnimation.IsComplete);
+            Assert.True(isCompleteFired);
+        }
+
+        [Fact]
+        public void Non_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Complete_When_AnimationDuration_Is_Reached_Over_Multiple_Updates()
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                false
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(0));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.True(spriteSheetAnimation.IsComplete);
+            Assert.True(isCompleteFired);
+
+            isCompleteFired = false; // Reset isCompleteFired for next execution
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.True(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired); // Event is not fired again as animation was already completed
+        }
+
+        [Theory]
+        [InlineData(1, 0)]
+        [InlineData(1, 0.9f)]
+        [InlineData(0, 1f)]
+        [InlineData(0, 1.9f)]
+        [InlineData(1, 2f)]
+        [InlineData(1, 2.9f)]
+        [InlineData(0, 3f)]
+        [InlineData(1, 4f)]
+        [InlineData(0, 5f)]
+        public void Reversed_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Not_Complete(int expectedTextureRegionIndex, float time)
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                true,
+                true
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(time));
+
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[expectedTextureRegionIndex], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+        }
+
+        [Fact]
+        public void Reversed_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Not_Complete_Over_Multiple_Updates()
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                true,
+                true
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(0));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+        }
+
+        [Theory]
+        [InlineData(1, 0.9f)]
+        [InlineData(0, 1f)]
+        [InlineData(0, 1.1f)]
+        [InlineData(0, 1.9f)]
+        public void Reversed_Non_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Not_Complete(int expectedTextureRegionIndex, float time)
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                false,
+                true
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(time));
+
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[expectedTextureRegionIndex], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+        }
+
+        [Theory]
+        [InlineData(0, 2f)]
+        [InlineData(0, 3f)]
+        [InlineData(0, 4f)]
+        public void Reversed_Non_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Complete_When_AnimationDuration_Is_Reached(int expectedTextureRegionIndex, float time)
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                false,
+                true
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(time));
+
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[expectedTextureRegionIndex], spriteSheetAnimation.CurrentFrame);
+            Assert.True(spriteSheetAnimation.IsComplete);
+            Assert.True(isCompleteFired);
+        }
+
+        [Fact]
+        public void Reversed_Non_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Complete_When_AnimationDuration_Is_Reached_Over_Multiple_Updates()
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                false,
+                true
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(0));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.True(spriteSheetAnimation.IsComplete);
+            Assert.True(isCompleteFired);
+
+            isCompleteFired = false; // Reset isCompleteFired for next execution
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.True(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);  // Event is not fired again as animation was already completed;
+        }
+
+        [Theory]
+        [InlineData(0, 0)]
+        [InlineData(0, 0.9f)]
+        [InlineData(1, 1f)]
+        [InlineData(1, 1.9f)]
+        [InlineData(0, 2f)]
+        [InlineData(0, 2.9f)]
+        [InlineData(1, 3f)]
+        [InlineData(0, 4f)]
+        [InlineData(1, 5f)]
+        [InlineData(0, 6f)]
+        [InlineData(1, 7f)]
+        [InlineData(0, 8f)]
+        public void PingPong_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Not_Complete(int expectedTextureRegionIndex, float time)
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                true,
+                false,
+                true
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(time));
+
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[expectedTextureRegionIndex], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+        }
+
+        [Fact]
+        public void PingPong_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Not_Complete_Over_Multiple_Updates()
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                true,
+                false,
+                true
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(0));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+        }
+
+        [Theory]
+        [InlineData(0, 0.9f)]
+        [InlineData(1, 1f)]
+        [InlineData(1, 1.9f)]
+        [InlineData(0, 2f)]
+        [InlineData(0, 2.9f)]
+        public void PingPong_Non_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Not_Complete(int expectedTextureRegionIndex, float time)
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                false,
+                false,
+                true
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(time));
+
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[expectedTextureRegionIndex], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+        }
+
+        [Theory]
+        [InlineData(0, 3f)]
+        [InlineData(0, 4f)]
+        [InlineData(0, 5f)]
+        public void PingPong_Non_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Complete_When_AnimationDuration_Is_Reached(int expectedTextureRegionIndex, float time)
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                false,
+                false,
+                true
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(time));
+
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[expectedTextureRegionIndex], spriteSheetAnimation.CurrentFrame);
+            Assert.True(spriteSheetAnimation.IsComplete);
+            Assert.True(isCompleteFired);
+        }
+
+        [Fact]
+        public void PingPong_Non_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Complete_When_AnimationDuration_Is_Reached_Over_Multiple_Updates()
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+            var textureRegion2D3 = new TextureRegion2D("Region 3", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2, textureRegion2D3 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1, 2 },
+                1,
+                false,
+                false,
+                true
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(0));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[2], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.True(spriteSheetAnimation.IsComplete);
+            Assert.True(isCompleteFired);
+
+            isCompleteFired = false; // Reset isCompleteFired for next execution
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.True(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired); // Event is not fired again as animation was already completed
+        }
+
+        [Theory]
+        [InlineData(1, 0)]
+        [InlineData(1, 0.9f)]
+        [InlineData(0, 1f)]
+        [InlineData(0, 1.9f)]
+        [InlineData(1, 2f)]
+        [InlineData(1, 2.9f)]
+        [InlineData(0, 3f)]
+        [InlineData(1, 4f)]
+        [InlineData(0, 5f)]
+        [InlineData(1, 6f)]
+        [InlineData(0, 7f)]
+        [InlineData(1, 8f)]
+        public void Reversed_PingPong_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Not_Complete(int expectedTextureRegionIndex, float time)
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                true,
+                true,
+                true
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(time));
+
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[expectedTextureRegionIndex], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+        }
+
+        [Fact]
+        public void Reversed_PingPong_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Not_Complete_Over_Multiple_Updates()
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                true,
+                true,
+                true
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(0));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+        }
+
+        [Theory]
+        [InlineData(1, 0.9f)]
+        [InlineData(0, 1f)]
+        [InlineData(0, 1.9f)]
+        [InlineData(1, 2f)]
+        [InlineData(1, 2.9f)]
+        public void Reversed_PingPong_Non_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Not_Complete(int expectedTextureRegionIndex, float time)
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                false,
+                true,
+                true
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(time));
+
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[expectedTextureRegionIndex], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+        }
+
+        [Theory]
+        [InlineData(1, 3f)]
+        [InlineData(1, 4f)]
+        [InlineData(1, 5f)]
+        public void Reversed_PingPong_Non_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Complete_When_AnimationDuration_Is_Reached(int expectedTextureRegionIndex, float time)
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1 },
+                1,
+                false,
+                true,
+                true
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(time));
+
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[expectedTextureRegionIndex], spriteSheetAnimation.CurrentFrame);
+            Assert.True(spriteSheetAnimation.IsComplete);
+            Assert.True(isCompleteFired);
+        }
+
+        [Fact]
+        public void Reversed_PingPong_Non_Looping_SpriteSheetAnimation_Should_Return_Correct_Frame_And_Complete_When_AnimationDuration_Is_Reached_Over_Multiple_Updates()
+        {
+            var textureRegion2D1 = new TextureRegion2D("Region 1", null, new Rectangle());
+            var textureRegion2D2 = new TextureRegion2D("Region 2", null, new Rectangle());
+            var textureRegion2D3 = new TextureRegion2D("Region 3", null, new Rectangle());
+
+            var textureRegions = new[] { textureRegion2D1, textureRegion2D2, textureRegion2D3 };
+
+            var spriteSheetAnimationData = new SpriteSheetAnimationData(
+                new[] { 0, 1, 2 },
+                1,
+                false,
+                true,
+                true
+            );
+
+            var spriteSheetAnimation = new SpriteSheetAnimation("Test", textureRegions, spriteSheetAnimationData);
+
+            var isCompleteFired = false;
+            spriteSheetAnimation.OnCompleted += () => isCompleteFired = true;
+
+            spriteSheetAnimation.Play();
+
+            var gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(0));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[2], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[0], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[1], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[2], spriteSheetAnimation.CurrentFrame);
+            Assert.False(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired);
+
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[2], spriteSheetAnimation.CurrentFrame);
+            Assert.True(spriteSheetAnimation.IsComplete);
+            Assert.True(isCompleteFired);
+
+            isCompleteFired = false; // Reset isCompleteFired for next execution
+            gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            spriteSheetAnimation.Update(gameTime);
+
+            Assert.Equal(textureRegions[2], spriteSheetAnimation.CurrentFrame);
+            Assert.True(spriteSheetAnimation.IsComplete);
+            Assert.False(isCompleteFired); // Event is not fired again as animation was already completed
+        }
+    }
+}
diff --git a/Plugins/MonoGame.Extended/tests/MonoGame.Extended.Tests/Sprites/SpriteTests.cs b/Plugins/MonoGame.Extended/tests/MonoGame.Extended.Tests/Sprites/SpriteTests.cs
new file mode 100644
index 0000000..307e272
--- /dev/null
+++ b/Plugins/MonoGame.Extended/tests/MonoGame.Extended.Tests/Sprites/SpriteTests.cs
@@ -0,0 +1,91 @@
+//using Microsoft.Xna.Framework;
+//using Microsoft.Xna.Framework.Graphics;
+//using MonoGame.Extended.Sprites;
+//using MonoGame.Extended.TextureAtlases;
+//using NSubstitute;
+//using Xunit;
+
+//namespace MonoGame.Extended.Tests.Sprites
+//{
+//    
+//    public class SpriteTests
+//    {
+//        [Fact]
+//        public void Sprite_BoundingRectangleAfterPosition_Test()
+//        {
+//            var graphicsDevice = TestHelper.CreateGraphicsDevice();
+//            var texture = Substitute.For<Texture2D>(graphicsDevice, 50, 200);
+//            var sprite = new Sprite(texture);
+
+//            Assert.Equal(new RectangleF(375, 140, 50, 200), sprite.GetBoundingRectangle(new Vector2(400, 240), 0, Vector2.One));
+//        }
+
+//        [Fact]
+//        public void Sprite_BoundingRectangleAfterOrigin_Test()
+//        {
+//            var graphicsDevice = TestHelper.CreateGraphicsDevice();
+//            var texture = Substitute.For<Texture2D>(graphicsDevice, 50, 200);
+//            var sprite = new Sprite(texture) { OriginNormalized = new Vector2(1.0f, 1.0f) };
+
+//            Assert.Equal(new RectangleF(-50, -200, 50, 200), sprite.GetBoundingRectangle(Vector2.Zero, 0, Vector2.One));
+//        }
+
+//        [Fact]
+//        public void Sprite_BoundingRectangleAfterScale_Test()
+//        {
+//            var graphicsDevice = TestHelper.CreateGraphicsDevice();
+//            var texture = Substitute.For<Texture2D>(graphicsDevice, 50, 200);
+//            var sprite = new Sprite(texture);
+
+//            Assert.Equal(new RectangleF(-50, -200, 100, 400), sprite.GetBoundingRectangle(Vector2.Zero, 0, Vector2.One * 2.0f));
+//        }
+
+//        [Fact]
+//        public void Sprite_BoundingRectangleAfterRotation_Test()
+//        {
+//            var graphicsDevice = TestHelper.CreateGraphicsDevice();
+//            var texture = Substitute.For<Texture2D>(graphicsDevice, 50, 200);
+//            var sprite = new Sprite(texture);
+
+//            AssertExtensions.AreApproximatelyEqual(new RectangleF(-100, -25, 200, 50), sprite.GetBoundingRectangle(Vector2.Zero, MathHelper.ToRadians(90), Vector2.One * 2.0f));
+//        }
+
+//        [Fact]
+//        public void Sprite_TextureRegionIsFullTextureWhenTextureConstructorIsUsed_Test()
+//        {
+//            var graphicsDevice = TestHelper.CreateGraphicsDevice();
+//            var texture = Substitute.For<Texture2D>(graphicsDevice, 100, 200);
+//            var sprite = new Sprite(texture);
+
+//            Assert.Equal(new Rectangle(0, 0, 100, 200), sprite.TextureRegion.Bounds);
+//        }
+
+//        [Fact]
+//        public void Sprite_DefaultOriginIsCentre_Test()
+//        {
+//            var graphicsDevice = TestHelper.CreateGraphicsDevice();
+//            var texture = Substitute.For<Texture2D>(graphicsDevice, 100, 200);
+//            var sprite = new Sprite(texture);
+            
+//            Assert.Equal(new Vector2(0.5f, 0.5f), sprite.OriginNormalized);
+//            Assert.Equal(new Vector2(50, 100), sprite.Origin);
+//        }
+
+//        [Fact]
+//        public void Sprite_PreserveNormalizedOriginWhenTextureRegionChanges_Test()
+//        {
+//            var graphicsDevice = TestHelper.CreateGraphicsDevice();
+//            var texture = Substitute.For<Texture2D>(graphicsDevice, 100, 100);
+//            var textureRegion = new TextureRegion2D(texture, 10, 20, 30, 40);
+//            var sprite = new Sprite(textureRegion);
+
+//            Assert.Equal(new Vector2(0.5f, 0.5f), sprite.OriginNormalized);
+//            Assert.Equal(new Vector2(15, 20), sprite.Origin);
+
+//            sprite.TextureRegion = new TextureRegion2D(texture, 30, 40, 50, 60);
+
+//            Assert.Equal(new Vector2(0.5f, 0.5f), sprite.OriginNormalized);
+//            Assert.Equal(new Vector2(25, 30), sprite.Origin);
+//        }
+//    }
+//}