eslint/tests/lib/rules/no-unmodified-loop-condition.js

   1 /**
   2  * @fileoverview Tests for no-unmodified-loop-condition rule.
   3  * @author Toru Nagashima
   4  */
   5
   6 "use strict";
   7
   8 //------------------------------------------------------------------------------
   9 // Requirements
  10 //------------------------------------------------------------------------------
  11
  12 const rule = require("../../../lib/rules/no-unmodified-loop-condition"),
  13     { RuleTester } = require("../../../lib/rule-tester");
  14
  15 //------------------------------------------------------------------------------
  16 // Tests
  17 //------------------------------------------------------------------------------
  18
  19 const ruleTester = new RuleTester();
  20
  21 ruleTester.run("no-unmodified-loop-condition", rule, {
  22     valid: [
  23         "var foo = 0; while (foo) { ++foo; }",
  24         { code: "let foo = 0; while (foo) { ++foo; }", env: { es6: true } },
  25         "var foo = 0; while (foo) { foo += 1; }",
  26         "var foo = 0; while (foo++) { }",
  27         "var foo = 0; while (foo = next()) { }",
  28         "var foo = 0; while (ok(foo)) { }",
  29         "var foo = 0, bar = 0; while (++foo < bar) { }",
  30         "var foo = 0, obj = {}; while (foo === obj.bar) { }",
  31         "var foo = 0, f = {}, bar = {}; while (foo === f(bar)) { }",
  32         "var foo = 0, f = {}; while (foo === f()) { }",
  33         { code: "var foo = 0, tag = 0; while (foo === tag`abc`) { }", env: { es6: true } },
  34         { code: "function* foo() { var foo = 0; while (yield foo) { } }", env: { es6: true } },
  35         { code: "function* foo() { var foo = 0; while (foo === (yield)) { } }", env: { es6: true } },
  36         "var foo = 0; while (foo.ok) { }",
  37         "var foo = 0; while (foo) { update(); } function update() { ++foo; }",
  38         "var foo = 0, bar = 9; while (foo < bar) { foo += 1; }",
  39         "var foo = 0, bar = 1, baz = 2; while (foo ? bar : baz) { foo += 1; }",
  40         "var foo = 0, bar = 0; while (foo && bar) { ++foo; ++bar; }",
  41         "var foo = 0, bar = 0; while (foo || bar) { ++foo; ++bar; }",
  42         "var foo = 0; do { ++foo; } while (foo);",
  43         "var foo = 0; do { } while (foo++);",
  44         "for (var foo = 0; foo; ++foo) { }",
  45         "for (var foo = 0; foo;) { ++foo }",
  46         "var foo = 0, bar = 0; for (bar; foo;) { ++foo }",
  47         "var foo; if (foo) { }",
  48         "var a = [1, 2, 3]; var len = a.length; for (var i = 0; i < len - 1; i++) {}"
  49     ],
  50     invalid: [
  51         { code: "var foo = 0; while (foo) { } foo = 1;", errors: [{ messageId: "loopConditionNotModified", data: { name: "foo" } }] },
  52         { code: "var foo = 0; while (!foo) { } foo = 1;", errors: [{ messageId: "loopConditionNotModified", data: { name: "foo" } }] },
  53         { code: "var foo = 0; while (foo != null) { } foo = 1;", errors: [{ messageId: "loopConditionNotModified", data: { name: "foo" } }] },
  54         {
  55             code: "var foo = 0, bar = 9; while (foo < bar) { } foo = 1;",
  56             errors: [
  57                 { messageId: "loopConditionNotModified", data: { name: "foo" } },
  58                 { messageId: "loopConditionNotModified", data: { name: "bar" } }
  59             ]
  60         },
  61         { code: "var foo = 0, bar = 0; while (foo && bar) { ++bar; } foo = 1;", errors: [{ messageId: "loopConditionNotModified", data: { name: "foo" } }] },
  62         { code: "var foo = 0, bar = 0; while (foo && bar) { ++foo; } foo = 1;", errors: [{ messageId: "loopConditionNotModified", data: { name: "bar" } }] },
  63         {
  64             code: "var a, b, c; while (a < c && b < c) { ++a; } foo = 1;",
  65             errors: [
  66                 { messageId: "loopConditionNotModified", data: { name: "b" } },
  67                 { messageId: "loopConditionNotModified", data: { name: "c" } }
  68             ]
  69         },
  70         { code: "var foo = 0; while (foo ? 1 : 0) { } foo = 1;", errors: [{ messageId: "loopConditionNotModified", data: { name: "foo" } }] },
  71         { code: "var foo = 0; while (foo) { update(); } function update(foo) { ++foo; }", errors: [{ messageId: "loopConditionNotModified", data: { name: "foo" } }] },
  72         { code: "var foo; do { } while (foo);", errors: [{ messageId: "loopConditionNotModified", data: { name: "foo" } }] },
  73         { code: "for (var foo = 0; foo < 10; ) { } foo = 1;", errors: [{ messageId: "loopConditionNotModified", data: { name: "foo" } }] }
  74     ]
  75 });