Implement two example functions demonstrating try-catching

inngest-test-server/src/main/kotlin/com/inngest/testserver/App.kt

@@ -26,6 +26,8 @@ fun Application.module() {
                 RestoreFromGlacier(),
                 ProcessUserSignup(),
                 TranscodeVideo(),
+                ImageFromPrompt(),
+                PushToSlackChannel(),
             ),
         )
     }

inngest-test-server/src/main/kotlin/com/inngest/testserver/ImageFromPrompt.kt

@@ -0,0 +1,47 @@
+package com.inngest.testserver
+
+import com.inngest.*
+
+class ImageFromPrompt : InngestFunction() {
+    override fun config(builder: InngestFunctionConfigBuilder): InngestFunctionConfigBuilder =
+        builder
+            .id("ImageFromPrompt")
+            .name("Image from Prompt")
+            .triggerEvent("media/prompt.created")
+
+    override fun execute(
+        ctx: FunctionContext,
+        step: Step,
+    ): String {
+        val imageURL =
+            try {
+                step.run("generate-image-dall-e") {
+                    // Call the DALL-E model to generate an image
+                    throw Exception("Failed to generate image")
+
+                    "example.com/image-dall-e.jpg"
+                }
+            } catch (e: StepError) {
+                // Fall back to a different image generation model
+                step.run("generate-image-midjourney") {
+                    // Call the MidJourney model to generate an image
+                    "example.com/image-midjourney.jpg"
+                }
+            }
+
+        try {
+            step.invoke<Map<String, Any>>(
+                "push-to-slack-channel",
+                "ktor-dev",
+                "PushToSlackChannel",
+                mapOf("image" to imageURL),
+                null,
+            )
+        } catch (e: StepError) {
+            // Pushing to Slack is not critical, so we can ignore the error, log it
+            // or handle it in some other way.
+        }
+
+        return imageURL
+    }
+}

inngest-test-server/src/main/kotlin/com/inngest/testserver/PushToSlackChannel.kt

@@ -0,0 +1,22 @@
+package com.inngest.testserver
+
+import com.inngest.*
+
+class PushToSlackChannel : InngestFunction() {
+    override fun config(builder: InngestFunctionConfigBuilder): InngestFunctionConfigBuilder =
+        builder
+            .id("PushToSlackChannel")
+            .name("Push to Slack Channel")
+            .triggerEvent("media/image.generated")
+
+    override fun execute(
+        ctx: FunctionContext,
+        step: Step,
+    ): String =
+        step.run("push-to-slack-channel") {
+            // Call Slack API to push the image to a channel
+            throw NonRetriableError("Failed to push image to Slack channel ${ctx.event.data["image"]}")
+
+            "Image pushed to Slack channel"
+        }
+}