chore(lib/wasmer): NewTestInstanceWithTrie checks if targetRuntime is a valid filepath

lib/runtime/test_helpers.go

@@ -57,8 +57,14 @@ var (
 // GetRuntime returns the runtime file path located in the
 // /tmp/gossamer/runtimes directory (depending on OS and environment).
 // If the file did not exist, the runtime WASM blob is downloaded to that file.
+// If the runtime argument is not defined in the constants.go and is a valid
+// file path, the runtime argument is returned.
 func GetRuntime(ctx context.Context, runtime string) (
 	runtimePath string, err error) {
+	if utils.PathExists(runtime) {
+		return runtime, nil
+	}
+
 	basePath := filepath.Join(os.TempDir(), "/gossamer/runtimes/")
 	const perm = os.FileMode(0777)
 	err = os.MkdirAll(basePath, perm)

lib/runtime/wasmer/test_helpers.go

@@ -26,16 +26,19 @@ func NewTestInstance(t *testing.T, targetRuntime string) *Instance {
 	return NewTestInstanceWithTrie(t, targetRuntime, nil)
 }
 
-// NewTestInstanceWithTrie will create a new runtime (polkadot/test) with the supplied trie as the storage
+// NewTestInstanceWithTrie returns an instance based on the target runtime string specified,
+// which can be a file path or a constant from the constants defined in `lib/runtime/constants.go`.
+// The instance uses the trie given as argument for its storage.
 func NewTestInstanceWithTrie(t *testing.T, targetRuntime string, tt *trie.Trie) *Instance {
 	t.Helper()
 
 	cfg := setupConfig(t, tt, DefaultTestLogLvl, common.NoNetworkRole, targetRuntime)
-	runtimeFilepath, err := runtime.GetRuntime(context.Background(), targetRuntime)
+	targetRuntime, err := runtime.GetRuntime(context.Background(), targetRuntime)
 	require.NoError(t, err)
 
-	r, err := NewInstanceFromFile(runtimeFilepath, cfg)
+	r, err := NewInstanceFromFile(targetRuntime, cfg)
 	require.NoError(t, err)
+
 	return r
 }