1 files changed, 49 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/wasm/start.js b/js/src/jit-test/tests/wasm/start.js
new file mode 100644
index 0000000000..2591d30321
--- /dev/null
+++ b/js/src/jit-test/tests/wasm/start.js
@@ -0,0 +1,49 @@
+assertErrorMessage(() => wasmEvalText('(module (func) (start 0) (start 0))'), SyntaxError, /wasm text error/);
+assertErrorMessage(() => wasmEvalText('(module (func) (start $unknown))'), SyntaxError, /failed to find/);
+
+wasmFailValidateText('(module (func) (start 1))', /unknown start function/);
+wasmFailValidateText('(module (func (param i32)) (start 0))', /must be nullary/);
+wasmFailValidateText('(module (func (param i32) (param f32)) (start 0))', /must be nullary/);
+wasmFailValidateText('(module (func (param i32) (param f32) (param f64)) (start 0))', /must be nullary/);
+wasmFailValidateText('(module (func (result f32)) (start 0))', /must not return anything/);
+
+// Basic use case.
+var count = 0;
+function inc() { count++; }
+var exports = wasmEvalText(`(module (import "" "inc" (func $imp)) (func $f (call $imp)) (start $f))`, { "":{inc} }).exports;
+assertEq(count, 1);
+assertEq(Object.keys(exports).length, 0);
+
+count = 0;
+exports = wasmEvalText(`(module (import "" "inc" (func)) (func $start (call 0)) (start $start) (export "" (func 0)))`, { "":{inc} }).exports;
+assertEq(count, 1);
+assertEq(typeof exports[""], 'function');
+assertEq(exports[""](), undefined);
+assertEq(count, 2);
+
+// New API.
+const Module = WebAssembly.Module;
+const Instance = WebAssembly.Instance;
+
+count = 0;
+const m = new Module(wasmTextToBinary('(module (import "" "inc" (func $imp)) (func) (func $start (call $imp)) (start $start) (export "" (func $start)))'));
+assertEq(count, 0);
+
+assertErrorMessage(() => new Instance(m), TypeError, /second argument must be an object/);
+assertEq(count, 0);
+
+const i1 = new Instance(m, { "":{inc} });
+assertEq(count, 1);
+i1.exports[""]();
+assertEq(count, 2);
+
+const i2 = new Instance(m, { "":{inc} });
+assertEq(count, 3);
+
+function fail() { assertEq(true, false); }
+
+count = 0;
+const m2 = new Module(wasmTextToBinary('(module (import "" "fail" (func)) (import "" "inc" (func $imp)) (func) (start $imp))'));
+assertEq(count, 0);
+new Instance(m2, {"":{ inc, fail }});
+assertEq(count, 1);