[wasm] JS API tests for `WebAssembly.validate`

test/mjsunit/wasm/js-api.js

Index: test/mjsunit/wasm/js-api.js
diff --git a/test/mjsunit/wasm/js-api.js b/test/mjsunit/wasm/js-api.js
index 60ed7474211db3d64f60d42f472f064616811bc0..259754018b828ed00d81cd73df1e2188510eed9d 100644
--- a/test/mjsunit/wasm/js-api.js
+++ b/test/mjsunit/wasm/js-api.js
@@ -41,6 +41,13 @@ let importingModuleBinary = (() => {
   return new Int8Array(builder.toBuffer());
 })();
 
+let moduleBinaryImporting2Memories = (() => {
+  var builder = new WasmModuleBuilder();
+  builder.addImportedMemory("", "memory1");
+  builder.addImportedMemory("", "memory2");
+  return new Int8Array(builder.toBuffer());
+})();
+
 // 'WebAssembly' data property on global object
 let wasmDesc = Object.getOwnPropertyDescriptor(this, 'WebAssembly');
 assertEq(typeof wasmDesc.value, "object");
@@ -478,6 +485,13 @@ assertEq(tbl.length, 2);
 assertErrorMessage(() => tbl.grow(1), Error, /failed to grow table/);
 }
 
+// 'WebAssembly.validate' function
+assertErrorMessage(() => WebAssembly.validate(), TypeError);
+assertErrorMessage(() => WebAssembly.validate("hi"), TypeError);
+assertEq(WebAssembly.validate(emptyModuleBinary), true);
+// TODO: other ways for validate to return false.
+assertEq(WebAssembly.validate(moduleBinaryImporting2Memories), false);
+
 // 'WebAssembly.compile' data property
 let compileDesc = Object.getOwnPropertyDescriptor(WebAssembly, 'compile');
 assertEq(typeof compileDesc.value, "function");