From ce84b1d1c0330241902a29a63fa37bcd5fae70a5 Mon Sep 17 00:00:00 2001
From: Joshua Groves <josh@joshgroves.com>
Date: Sat, 13 Feb 2021 17:24:31 -0330
Subject: [PATCH] [wgsl] Add parser error snapshot

---
 tests/errors.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 tests/errors.rs

diff --git a/tests/errors.rs b/tests/errors.rs
new file mode 100644
index 000000000..81841a82e
--- /dev/null
+++ b/tests/errors.rs
@@ -0,0 +1,15 @@
+#[cfg(feature = "wgsl-in")]
+macro_rules! err {
+    ($value:expr, @$snapshot:literal) => {
+        ::insta::assert_snapshot!(naga::front::wgsl::parse_str($value).expect_err("expected parser error").to_string(), @$snapshot);
+    };
+}
+
+#[cfg(feature = "wgsl-in")]
+#[test]
+fn function_without_identifier() {
+    err!(
+        "fn () {}",
+        @"error while parsing WGSL in scopes [FunctionDecl] at line 1 pos 4: unexpected token Paren('('), expected ident"
+    );
+}