Samples fixes (#5169)

dotnet/eng/verify-samples/AgentsSamples.cs

@@ -246,7 +246,7 @@ internal static class AgentsSamples
             ExpectedOutputDescription =
             [
                 "The output should contain information about both the current time and the weather in Seattle.",
-                "The weather information should reference the plugin result: cloudy with a high of 15°C.",
+                "The weather information should be similar to: cloudy with a high of 15°C. Exact phrasing may vary.",
                 "The output should not contain error messages or stack traces.",
             ],
         },
@@ -521,7 +521,7 @@ internal static class AgentsSamples
             OptionalEnvironmentVariables = ["AZURE_AI_MODEL_DEPLOYMENT_NAME"],
             ExpectedOutputDescription =
             [
-                "The output should demonstrate server-side conversation sessions with non-streaming and streaming turns.",
+                "The output should contain multiple joke responses showing a multi-turn conversation.",
                 "The output should not contain error messages or stack traces.",
             ],
         },

dotnet/src/Microsoft.Agents.AI.Workflows/Checkpointing/FileSystemJsonCheckpointStore.cs

@@ -168,7 +168,7 @@ public sealed class FileSystemJsonCheckpointStore : JsonCheckpointStore, IDispos
         string filePath = Path.Combine(this.Directory.FullName, fileName);
 
         if (!this.CheckpointIndex.Contains(key) ||
-            !File.Exists(fileName))
+            !File.Exists(filePath))
         {
             throw new KeyNotFoundException($"Checkpoint '{key.CheckpointId}' not found in store at '{this.Directory.FullName}'.");
         }

dotnet/tests/Microsoft.Agents.AI.Workflows.UnitTests/FileSystemJsonCheckpointStoreTests.cs

@@ -178,4 +178,23 @@ public sealed class FileSystemJsonCheckpointStoreTests
         Func<Task> createCheckpointAction = async () => await store.CreateCheckpointAsync(runId, TestData);
         await createCheckpointAction.Should().NotThrowAsync();
     }
+
+    [Fact]
+    public async Task RetrieveCheckpointAsync_ShouldReturnPersistedDataAsync()
+    {
+        // Arrange
+        using TempDirectory tempDirectory = new();
+        using FileSystemJsonCheckpointStore store = new(tempDirectory);
+
+        string sessionId = Guid.NewGuid().ToString("N");
+        JsonElement originalData = JsonSerializer.SerializeToElement(new { name = "test", value = 42 });
+
+        // Act
+        CheckpointInfo checkpoint = await store.CreateCheckpointAsync(sessionId, originalData);
+        JsonElement retrieved = await store.RetrieveCheckpointAsync(sessionId, checkpoint);
+
+        // Assert
+        retrieved.GetProperty("name").GetString().Should().Be("test");
+        retrieved.GetProperty("value").GetInt32().Should().Be(42);
+    }
 }