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yoda.js
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yoda.js
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/**
* @fileoverview Tests for yoda rule.
* @author Raphael Pigulla
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/yoda"),
{ RuleTester } = require("../../../lib/rule-tester");
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
const ruleTester = new RuleTester();
ruleTester.run("yoda", rule, {
valid: [
// "never" mode
{ code: "if (value === \"red\") {}", options: ["never"] },
{ code: "if (value === value) {}", options: ["never"] },
{ code: "if (value != 5) {}", options: ["never"] },
{ code: "if (5 & foo) {}", options: ["never"] },
{ code: "if (5 === 4) {}", options: ["never"] },
// "always" mode
{ code: "if (\"blue\" === value) {}", options: ["always"] },
{ code: "if (value === value) {}", options: ["always"] },
{ code: "if (4 != value) {}", options: ["always"] },
{ code: "if (foo & 4) {}", options: ["always"] },
{ code: "if (5 === 4) {}", options: ["always"] },
// Range exception
{
code: "if (0 < x && x <= 1) {}",
options: ["never", { exceptRange: true }]
}, {
code: "if (x < 0 || 1 <= x) {}",
options: ["never", { exceptRange: true }]
}, {
code: "if (0 <= x && x < 1) {}",
options: ["always", { exceptRange: true }]
}, {
code: "if (x <= 'bar' || 'foo' < x) {}",
options: ["always", { exceptRange: true }]
}, {
code: "if ('blue' < x.y && x.y < 'green') {}",
options: ["never", { exceptRange: true }]
}, {
code: "if (0 < x[``] && x[``] < 100) {}",
options: ["never", { exceptRange: true }],
parserOptions: { ecmaVersion: 2015 }
}, {
code: "if (0 < x[''] && x[``] < 100) {}",
options: ["never", { exceptRange: true }],
parserOptions: { ecmaVersion: 2015 }
}, {
code: "if (0 <= x['y'] && x['y'] <= 100) {}",
options: ["never", { exceptRange: true }]
}, {
code: "if (a < 0 && (0 < b && b < 1)) {}",
options: ["never", { exceptRange: true }]
}, {
code: "if ((0 < a && a < 1) && b < 0) {}",
options: ["never", { exceptRange: true }]
}, {
code: "if (a < 4 || (b[c[0]].d['e'] < 0 || 1 <= b[c[0]].d['e'])) {}",
options: ["never", { exceptRange: true }]
}, {
code: "if (-1 < x && x < 0) {}",
options: ["never", { exceptRange: true }]
}, {
code: "if (0 <= this.prop && this.prop <= 1) {}",
options: ["never", { exceptRange: true }]
}, {
code: "if (0 <= index && index < list.length) {}",
options: ["never", { exceptRange: true }]
}, {
code: "if (ZERO <= index && index < 100) {}",
options: ["never", { exceptRange: true }]
}, {
code: "if (value <= MIN || 10 < value) {}",
options: ["never", { exceptRange: true }]
}, {
code: "if (value <= 0 || MAX < value) {}",
options: ["never", { exceptRange: true }]
}, {
code: "if (0 <= a.b && a[\"b\"] <= 100) {}",
options: ["never", { exceptRange: true }]
},
// onlyEquality
{ code: "if (0 < x && x <= 1) {}", options: ["never", { onlyEquality: true }] },
{ code: "if (x !== 'foo' && 'foo' !== x) {}", options: ["never", { onlyEquality: true }] },
{ code: "if (x < 2 && x !== -3) {}", options: ["always", { onlyEquality: true }] }
],
invalid: [
{
code: "if (\"red\" == value) {}",
output: "if (value == \"red\") {}",
options: ["never"],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "==" },
type: "BinaryExpression"
}
]
},
{
code: "if (true === value) {}",
output: "if (value === true) {}",
options: ["never"],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "===" },
type: "BinaryExpression"
}
]
},
{
code: "if (5 != value) {}",
output: "if (value != 5) {}",
options: ["never"],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "!=" },
type: "BinaryExpression"
}
]
},
{
code: "if (null !== value) {}",
output: "if (value !== null) {}",
options: ["never"],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "!==" },
type: "BinaryExpression"
}
]
},
{
code: "if (\"red\" <= value) {}",
output: "if (value >= \"red\") {}",
options: ["never"],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<=" },
type: "BinaryExpression"
}
]
},
{
code: "if (true >= value) {}",
output: "if (value <= true) {}",
options: ["never"],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: ">=" },
type: "BinaryExpression"
}
]
},
{
code: "var foo = (5 < value) ? true : false",
output: "var foo = (value > 5) ? true : false",
options: ["never"],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<" },
type: "BinaryExpression"
}
]
},
{
code: "function foo() { return (null > value); }",
output: "function foo() { return (value < null); }",
options: ["never"],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: ">" },
type: "BinaryExpression"
}
]
},
{
code: "if (-1 < str.indexOf(substr)) {}",
output: "if (str.indexOf(substr) > -1) {}",
options: ["never"],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<" },
type: "BinaryExpression"
}
]
},
{
code: "if (value == \"red\") {}",
output: "if (\"red\" == value) {}",
options: ["always"],
errors: [
{
messageId: "expected",
data: { expectedSide: "left", operator: "==" },
type: "BinaryExpression"
}
]
},
{
code: "if (value === true) {}",
output: "if (true === value) {}",
options: ["always"],
errors: [
{
messageId: "expected",
data: { expectedSide: "left", operator: "===" },
type: "BinaryExpression"
}
]
},
{
code: "if (a < 0 && 0 <= b && b < 1) {}",
output: "if (a < 0 && b >= 0 && b < 1) {}",
options: ["never", { exceptRange: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<=" },
type: "BinaryExpression"
}
]
},
{
code: "if (0 <= a && a < 1 && b < 1) {}",
output: "if (a >= 0 && a < 1 && b < 1) {}",
options: ["never", { exceptRange: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<=" },
type: "BinaryExpression"
}
]
},
{
code: "if (1 < a && a < 0) {}",
output: "if (a > 1 && a < 0) {}",
options: ["never", { exceptRange: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<" },
type: "BinaryExpression"
}
]
},
{
code: "0 < a && a < 1",
output: "a > 0 && a < 1",
options: ["never", { exceptRange: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<" },
type: "BinaryExpression"
}
]
},
{
code: "var a = b < 0 || 1 <= b;",
output: "var a = b < 0 || b >= 1;",
options: ["never", { exceptRange: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<=" },
type: "BinaryExpression"
}
]
},
{
code: "if (0 <= x && x < -1) {}",
output: "if (x >= 0 && x < -1) {}",
options: ["never", { exceptRange: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<=" },
type: "BinaryExpression"
}
]
},
{
code: "var a = (b < 0 && 0 <= b);",
output: "var a = (0 > b && 0 <= b);",
options: ["always", { exceptRange: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "left", operator: "<" },
type: "BinaryExpression"
}
]
},
{
code: "if (0 <= a[b] && a['b'] < 1) {}",
output: "if (a[b] >= 0 && a['b'] < 1) {}",
options: ["never", { exceptRange: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<=" },
type: "BinaryExpression"
}
]
},
{
code: "if (0 <= a[b] && a.b < 1) {}",
output: "if (a[b] >= 0 && a.b < 1) {}",
options: ["never", { exceptRange: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<=" },
type: "BinaryExpression"
}
]
},
{
code: "if (0 <= a[''] && a.b < 1) {}",
output: "if (a[''] >= 0 && a.b < 1) {}",
options: ["never", { exceptRange: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<=" },
type: "BinaryExpression"
}
]
},
{
code: "if (0 <= a[''] && a[' '] < 1) {}",
output: "if (a[''] >= 0 && a[' '] < 1) {}",
options: ["never", { exceptRange: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<=" },
type: "BinaryExpression"
}
]
},
{
code: "if (0 <= a[''] && a[null] < 1) {}",
output: "if (a[''] >= 0 && a[null] < 1) {}",
options: ["never", { exceptRange: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<=" },
type: "BinaryExpression"
}
]
},
{
code: "if (0 <= a[''] && a[b] < 1) {}",
output: "if (a[''] >= 0 && a[b] < 1) {}",
options: ["never", { exceptRange: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<=" },
type: "BinaryExpression"
}
]
},
{
code: "if (0 <= a[''] && a[b()] < 1) {}",
output: "if (a[''] >= 0 && a[b()] < 1) {}",
options: ["never", { exceptRange: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<=" },
type: "BinaryExpression"
}
]
},
{
code: "if (0 <= a[b()] && a[b()] < 1) {}",
output: "if (a[b()] >= 0 && a[b()] < 1) {}",
options: ["never", { exceptRange: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<=" },
type: "BinaryExpression"
}
]
},
{
code: "if (3 == a) {}",
output: "if (a == 3) {}",
options: ["never", { onlyEquality: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "==" },
type: "BinaryExpression"
}
]
},
{
code: "foo(3 === a);",
output: "foo(a === 3);",
options: ["never", { onlyEquality: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "===" },
type: "BinaryExpression"
}
]
},
{
code: "foo(a === 3);",
output: "foo(3 === a);",
options: ["always", { onlyEquality: true }],
errors: [
{
messageId: "expected",
data: { expectedSide: "left", operator: "===" },
type: "BinaryExpression"
}
]
},
{
code: "if (0 <= x && x < 1) {}",
output: "if (x >= 0 && x < 1) {}",
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<=" },
type: "BinaryExpression"
}
]
},
{
code: "if ( /* a */ 0 /* b */ < /* c */ foo /* d */ ) {}",
output: "if ( /* a */ foo /* b */ > /* c */ 0 /* d */ ) {}",
options: ["never"],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "<" },
type: "BinaryExpression"
}
]
},
{
code: "if ( /* a */ foo /* b */ > /* c */ 0 /* d */ ) {}",
output: "if ( /* a */ 0 /* b */ < /* c */ foo /* d */ ) {}",
options: ["always"],
errors: [
{
messageId: "expected",
data: { expectedSide: "left", operator: ">" },
type: "BinaryExpression"
}
]
},
{
code: "if (foo()===1) {}",
output: "if (1===foo()) {}",
options: ["always"],
errors: [
{
messageId: "expected",
data: { expectedSide: "left", operator: "===" },
type: "BinaryExpression"
}
]
},
{
code: "if (foo() === 1) {}",
output: "if (1 === foo()) {}",
options: ["always"],
errors: [
{
messageId: "expected",
data: { expectedSide: "left", operator: "===" },
type: "BinaryExpression"
}
]
},
// https://github.com/eslint/eslint/issues/7326
{
code: "while (0 === (a));",
output: "while ((a) === 0);",
options: ["never"],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "===" },
type: "BinaryExpression"
}
]
},
{
code: "while (0 === (a = b));",
output: "while ((a = b) === 0);",
options: ["never"],
errors: [
{
messageId: "expected",
data: { expectedSide: "right", operator: "===" },
type: "BinaryExpression"
}
]
},
{
code: "while ((a) === 0);",
output: "while (0 === (a));",
options: ["always"],
errors: [
{
messageId: "expected",
data: { expectedSide: "left", operator: "===" },
type: "BinaryExpression"
}
]
},
{
code: "while ((a = b) === 0);",
output: "while (0 === (a = b));",
options: ["always"],
errors: [
{
messageId: "expected",
data: { expectedSide: "left", operator: "===" },
type: "BinaryExpression"
}
]
},
{
code: "if (((((((((((foo)))))))))) === ((((((5)))))));",
output: "if (((((((5)))))) === ((((((((((foo)))))))))));",
options: ["always"],
errors: [
{
messageId: "expected",
data: { expectedSide: "left", operator: "===" },
type: "BinaryExpression"
}
]
}
]
});