Added test for getting buffer from AudioBufferSourceNode and fixed bug with nullability of said method.

Author: KristofferStrube

src/KristofferStrube.Blazor.WebAudio/AudioNodes/AudioBufferSourceNode.cs

@@ -52,7 +52,14 @@ protected AudioBufferSourceNode(IJSRuntime jSRuntime, IJSObjectReference jSRefer
     public async Task<AudioBuffer?> GetBufferAsync()
     {
         IJSObjectReference helper = await webAudioHelperTask.Value;
-        IJSObjectReference? jSInstance = await helper.InvokeAsync<IJSObjectReference?>("getAttribute", JSReference, "buffer");
+        await using ValueReference bufferAttribute = new(JSRuntime, JSReference, "buffer");
+
+        if (await bufferAttribute.GetTypeNameAsync() is "null")
+        {
+            return null;
+        }
+
+        IJSObjectReference jSInstance = await helper.InvokeAsync<IJSObjectReference>("getAttribute", JSReference, "buffer");
         return jSInstance is null ? null : await AudioBuffer.CreateAsync(JSRuntime, jSInstance, new() { DisposesJSReference = true });
     }
 

tests/IntegrationTests/AudioNodeTests/AudioBufferSourceNodeTest.cs

@@ -1,9 +1,45 @@
-namespace IntegrationTests.AudioNodeTests;
+using FluentAssertions;
+
+namespace IntegrationTests.AudioNodeTests;
 
 public class AudioBufferSourceNodeTest : AudioNodeTest<AudioBufferSourceNode>
 {
     public override async Task<AudioBufferSourceNode> GetDefaultInstanceAsync()
     {
         return await AudioBufferSourceNode.CreateAsync(JSRuntime, await GetAudioContextAsync());
     }
+
+    [Test]
+    public async Task GetBufferAsync_ShouldReturnNull_WhenItHasNoBuffer()
+    {
+        // Arrange
+        await using AudioContext context = await AudioContext.CreateAsync(JSRuntime);
+
+        await using AudioBufferSourceNode node = await AudioBufferSourceNode.CreateAsync(JSRuntime, context);
+
+        // Act
+        AudioBuffer? buffer = await node.GetBufferAsync();
+
+        // Assert
+        _ = buffer.Should().BeNull();
+    }
+
+    [Test]
+    public async Task GetBufferAsync_ShouldReturnBuffer_WhenItHasBuffer()
+    {
+        // Arrange
+        await using AudioContext context = await AudioContext.CreateAsync(JSRuntime);
+        await using AudioBuffer buffer = await AudioBuffer.CreateAsync(JSRuntime, new AudioBufferOptions() { Length = 1, SampleRate = 8000 });
+
+        await using AudioBufferSourceNode node = await AudioBufferSourceNode.CreateAsync(JSRuntime, context, new()
+        {
+            Buffer = buffer
+        });
+
+        // Act
+        AudioBuffer? readBuffer = await node.GetBufferAsync();
+
+        // Assert
+        _ = readBuffer.Should().NotBeNull();
+    }
 }