Fix broken tests and remove syntax unsupported by Node 6

Author: Alhadis

package.json

@@ -19,9 +19,8 @@
 	},
 	"eslintConfig": {
 		"extends": "@alhadis/eslint-config",
-		"globals": {
-			"assert": true
-		}
+		"globals": {"assert": true},
+		"rules": {"prefer-object-spread": 0}
 	},
 	"scripts": {
 		"lint": "npx eslint . && npx tslint *.ts",

test/terminators.js

@@ -288,6 +288,6 @@ suite("Terminators", () => {
 				options: {foo: ["1", "2", undefined]},
 				argv: ["--foo", "4"],
 			},
-		}]) assert.deepEqual(getOpts(input, optdef, {...config, terminator}), expected);
+		}]) assert.deepEqual(getOpts(input, optdef, Object.assign({}, config, {terminator})), expected);
 	});
 });

test/undefined-options.js

@@ -53,7 +53,7 @@ suite("Undefined options", () => {
 			"--unknown",
 		], {"--bar": ""}, {
 			noUndefined: arg =>
-				new ReferenceError(`Can't find switch named "${arg.replace(/^-+/, "")}"`),
+				new ReferenceError("Can't find switch named `" + arg.replace(/^-+/, "") + "`"),
 		}), ReferenceError, "Can't find switch named `unknown`");
 	});