[Example] ggml: add model not found test

Signed-off-by: dm4 <[email protected]>

.github/workflows/llama.yml

@@ -209,6 +209,16 @@ jobs:
                 default \
                 'JSON object with 5 country names as keys and their capitals as values: '
 
+          - name: Model Not Found
+            run: |
+              test -f ~/.wasmedge/env && source ~/.wasmedge/env
+              cd wasmedge-ggml/test/model-not-found
+              cargo build --target wasm32-wasi --release
+              time wasmedge --dir .:. \
+                --nn-preload default:GGML:AUTO:model-not-found.gguf \
+                target/wasm32-wasi/release/wasmedge-ggml-model-not-found.wasm \
+                default
+
           - name: Build llama-stream
             run: |
               cd wasmedge-ggml/llama-stream

wasmedge-ggml/test/model-not-found/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "wasmedge-ggml-model-not-found"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+serde_json = "1.0"
+wasmedge-wasi-nn = "0.7.0"

wasmedge-ggml/test/model-not-found/README.md

@@ -0,0 +1,11 @@
+# `model-not-found`
+
+Ensure that we get the `ModelNotFound` error when the model does not exist.
+
+## Execute
+
+```console
+$ wasmedge --dir .:. \
+  --nn-preload default:GGML:AUTO:model-not-found.gguf \
+  wasmedge-ggml-model-not-found.wasm default
+```

wasmedge-ggml/test/model-not-found/src/main.rs

@@ -0,0 +1,24 @@
+use std::env;
+use wasmedge_wasi_nn::{self, BackendError, Error, ExecutionTarget, GraphBuilder, GraphEncoding};
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    let model_name: &str = &args[1];
+
+    // Create graph and initialize context.
+    let graph =
+        GraphBuilder::new(GraphEncoding::Ggml, ExecutionTarget::AUTO).build_from_cache(model_name);
+
+    // Check graph
+    match graph {
+        Err(Error::BackendError(BackendError::ModelNotFound)) => {
+            println!("Model not found");
+        }
+        Err(_) => {
+            panic!("Should be model not found");
+        }
+        Ok(_) => {
+            panic!("Should be model not found");
+        }
+    }
+}