add integration test for spread operator

test/cases/parsing/spread/a.js

@@ -0,0 +1 @@
+module.exports = "ok";

test/cases/parsing/spread/index.js

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+import X, { A, B } from "./module";
+import * as M from "./module";
+
+it("should support spread operator", function() {
+	var o1 = { ...X };
+	o1.should.be.eql({ A: "A", B: "B" });
+	var o2 = { ...({ X }) };
+	o2.should.be.eql({ X: { A: "A", B: "B" } });
+	var o3 = { ...M };
+	o3.should.be.eql({ default: { A: "A", B: "B" }, A: "A", B: "B" });
+});

test/cases/parsing/spread/module.js

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+const A = "A";
+const B = "B";
+
+export default { A, B };
+
+export { A, B };

test/cases/parsing/spread/test.filter.js

@@ -0,0 +1,5 @@
+var supportsSpread = require("../../../helpers/supportsSpread");
+
+module.exports = function(config) {
+	return supportsSpread();
+};

test/helpers/supportsSpread.js

@@ -0,0 +1,9 @@
+module.exports = function supportsSpread() {
+	try {
+		var x = { a: true }, y; // eslint-disable-line no-unused-vars
+		eval("y = { ...x }");
+		return y !== x && y.a;
+	} catch(e) {
+		return false;
+	}
+};