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/* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/publicdomain/zero/1.0/ */
"use strict";
// ------------------------------------------------------------------------------
// Requirements
// ------------------------------------------------------------------------------
var rule = require("../lib/rules/use-returnValue");
var RuleTester = require("eslint").RuleTester;
const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: "latest" } });
// ------------------------------------------------------------------------------
// Tests
// ------------------------------------------------------------------------------
function invalidCode(code, methodName) {
let message = `{Array/String}.${methodName} doesn't modify the instance in-place`;
return { code, errors: [{ message, type: "ExpressionStatement" }] };
}
ruleTester.run("use-returnValue", rule, {
valid: [
"a = foo.concat(bar)",
"b = bar.concat([1,3,4])",
"c = baz.concat()",
"d = qux.join(' ')",
"e = quux.slice(1)",
],
invalid: [
invalidCode("foo.concat(bar)", "concat"),
invalidCode("bar.concat([1,3,4])", "concat"),
invalidCode("baz.concat()", "concat"),
invalidCode("qux.join(' ')", "join"),
invalidCode("quux.slice(1)", "slice"),
],
});
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