arrow-body-style.js

/**
 * @fileoverview Tests for arrow-body-style
 * @author Alberto Rodríguez
 */
"use strict";

//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------

var rule = require("../../../lib/rules/arrow-body-style"),
    RuleTester = require("../../../lib/testers/rule-tester");

//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------

var ruleTester = new RuleTester();

ruleTester.run("arrow-body-style", rule, {
    valid: [
        { code: "var foo = () => {};", parserOptions: { ecmaVersion: 6 } },
        { code: "var foo = () => 0;", parserOptions: { ecmaVersion: 6 } },
        { code: "var addToB = (a) => { b =  b + a };", parserOptions: { ecmaVersion: 6 } },
        { code: "var foo = () => { /* do nothing */ };", parserOptions: { ecmaVersion: 6 } },
        { code: "var foo = () => {\n /* do nothing */ \n};", parserOptions: { ecmaVersion: 6 } },
        { code: "var foo = (retv, name) => {\nretv[name] = true;\nreturn retv;\n};", parserOptions: { ecmaVersion: 6 } },
        { code: "var foo = () => ({});", parserOptions: { ecmaVersion: 6 } },
        { code: "var foo = () => { bar(); };", parserOptions: { ecmaVersion: 6 } },
        { code: "var foo = () => { b = a };", parserOptions: { ecmaVersion: 6 } },
        { code: "var foo = () => { bar: 1 };", parserOptions: { ecmaVersion: 6 } },
        { code: "var foo = () => { return 0; };", parserOptions: { ecmaVersion: 6 }, options: ["always"] },
        { code: "var foo = () => { return bar(); };", parserOptions: { ecmaVersion: 6 }, options: ["always"] },
        { code: "var foo = () => 0;", parserOptions: { ecmaVersion: 6 }, options: ["never"] },
        { code: "var foo = () => ({ foo: 0 });", parserOptions: { ecmaVersion: 6 }, options: ["never"] }
    ],
    invalid: [
        {
            code: "var foo = () => 0;",
            parserOptions: { ecmaVersion: 6 },
            options: ["always"],
            errors: [
                { line: 1, column: 17, type: "ArrowFunctionExpression", message: "Expected block statement surrounding arrow body." }
            ]
        },
        {
            code: "var foo = () => ({});",
            parserOptions: { ecmaVersion: 6 },
            options: ["always"],
            errors: [
                { line: 1, column: 18, type: "ArrowFunctionExpression", message: "Expected block statement surrounding arrow body." }
            ]
        },
        {
            code: "var foo = () => { return 0; };",
            parserOptions: { ecmaVersion: 6 },
            options: ["as-needed"],
            errors: [
                { line: 1, column: 17, type: "ArrowFunctionExpression", message: "Unexpected block statement surrounding arrow body." }
            ]
        },
        {
            code: "var foo = () => { return bar(); };",
            parserOptions: { ecmaVersion: 6 },
            options: ["as-needed"],
            errors: [
                { line: 1, column: 17, type: "ArrowFunctionExpression", message: "Unexpected block statement surrounding arrow body." }
            ]
        },
        {
            code: "var foo = () => {\nreturn 0;\n};",
            parserOptions: { ecmaVersion: 6 },
            options: ["never"],
            errors: [
                { line: 1, column: 17, type: "ArrowFunctionExpression", message: "Unexpected block statement surrounding arrow body." }
            ]
        },
        {
            code: "var foo = (retv, name) => {\nretv[name] = true;\nreturn retv;\n};",
            parserOptions: { ecmaVersion: 6 },
            options: ["never"],
            errors: [
                { line: 1, column: 27, type: "ArrowFunctionExpression", message: "Unexpected block statement surrounding arrow body." }
            ]
        }
    ]
});