[NFC] Add a node test for fuzz_shell.js running on two input wasms (#7123)

This feature is depended on by our ClusterFuzz integration.

Author: kripken

test/lit/node/fuzz_shell_second.wast

@@ -0,0 +1,32 @@
+;; Test that the fuzz_shell.js file will run a second wasm file that is
+;; provided, and call its exports as well as the first module's.
+
+(module
+  (func $first (export "first") (result i32)
+    (i32.const 42)
+  )
+)
+
+;; Build both files to binary.
+;;
+;; RUN: wasm-opt %s -o %t.wasm -q
+;; RUN: wasm-opt %s.second -o %t.second.wasm -q
+
+;; Run in node.
+;;
+;; RUN: node %S/../../../scripts/fuzz_shell.js %t.wasm %t.second.wasm | filecheck %s
+;;
+;; CHECK: [fuzz-exec] calling first
+;; CHECK: [fuzz-exec] note result: first => 42
+;; CHECK: [fuzz-exec] calling second
+;; CHECK: [fuzz-exec] note result: second => 1337
+
+;; Run in reverse order, flipping the order in the output.
+;;
+;; RUN: node %S/../../../scripts/fuzz_shell.js %t.second.wasm %t.wasm | filecheck %s --check-prefix=REVERSE
+;;
+;; REVERSE: [fuzz-exec] calling second
+;; REVERSE: [fuzz-exec] note result: second => 1337
+;; REVERSE: [fuzz-exec] calling first
+;; REVERSE: [fuzz-exec] note result: first => 42
+

test/lit/node/fuzz_shell_second.wast.second

@@ -0,0 +1,8 @@
+;; Second module for the test.
+
+(module
+  (func $second (export "second") (result i32)
+    (i32.const 1337)
+  )
+)
+