test: add local wasm fixture

Author: pi0

test/fixture/server/routes/wasm/dynamic-import.ts

@@ -2,7 +2,7 @@ import { defineLazyEventHandler, defineHandler } from "nitro/h3";
 
 export default defineLazyEventHandler(async () => {
   // @ts-ignore
-  const { sum } = await import("unwasm/examples/sum.wasm").then((r) => r.default());
+  const { sum } = await import("./sum.wasm").then((r) => r.default());
   return defineHandler(() => {
     return `2+3=${sum(2, 3)}`;
   });

test/fixture/server/routes/wasm/static-import.ts

@@ -1,7 +1,7 @@
 import { defineHandler, defineLazyEventHandler } from "nitro/h3";
 
 // @ts-ignore
-import init, { sum } from "unwasm/examples/sum.wasm";
+import init, { sum } from "./sum.wasm";
 
 export default defineLazyEventHandler(async () => {
   // @ts-ignore

test/fixture/server/routes/wasm/sum.wasm

@@ -0,0 +1,6 @@
+;; Text source of `sum.wasm` (kept for reference, not part of the build).
+(module
+  (func (export "sum") (param i32 i32) (result i32)
+    local.get 0
+    local.get 1
+    i32.add))