feat(Tests): Add basic JobPool tests

Sally7.Tests/RequestExecutor/JobPoolTests.cs

@@ -0,0 +1,33 @@
+using System.Threading.Channels;
+using Sally7.RequestExecutor;
+
+namespace Sally7.Tests.RequestExecutor;
+
+public class JobPoolTests
+{
+    [Fact]
+    public async Task RentJobIdAsync_Throws_If_Disposed_And_Depleted()
+    {
+        // Arrange
+        var sut = new JobPool(1);
+        sut.Dispose();
+        _ = await sut.RentJobIdAsync(CancellationToken.None); // Empty the pool
+
+        // Act
+        // Assert
+        await Should.ThrowAsync<ChannelClosedException>(() => sut.RentJobIdAsync(CancellationToken.None).AsTask());
+    }
+
+    [Fact]
+    public void ReturnJobId_Does_Not_Throw_If_Disposed()
+    {
+        // Arrange
+        var sut = new JobPool(1);
+        var jobId = sut.RentJobIdAsync(CancellationToken.None).Result;
+        sut.Dispose();
+
+        // Act
+        // Assert
+        sut.ReturnJobId(jobId);
+    }
+}