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no-multiple-empty-lines.js
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no-multiple-empty-lines.js
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/**
* @fileoverview Disallows multiple blank lines.
* @author Greg Cochard
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const rule = require("../../../lib/rules/no-multiple-empty-lines"),
RuleTester = require("../../../lib/rule-tester/rule-tester");
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
/**
* Creates the expected error message object for the specified number of lines
* @param {lines} lines The number of lines expected.
* @returns {Object} the expected error message object
* @private
*/
function getExpectedError(lines) {
return {
messageId: "consecutiveBlank",
data: {
max: lines,
pluralizedLines: lines === 1 ? "line" : "lines"
},
type: "Program",
column: 1
};
}
/**
* Creates the expected error message object for the specified number of lines
* @param {lines} lines The number of lines expected.
* @returns {Object} the expected error message object
* @private
*/
function getExpectedErrorEOF(lines) {
return {
messageId: "blankEndOfFile",
data: {
max: lines
},
type: "Program",
column: 1
};
}
/**
* Creates the expected error message object for the specified number of lines
* @param {lines} lines The number of lines expected.
* @returns {Object} the expected error message object
* @private
*/
function getExpectedErrorBOF(lines) {
return {
messageId: "blankBeginningOfFile",
data: {
max: lines
},
type: "Program",
column: 1
};
}
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
const ruleTester = new RuleTester();
ruleTester.run("no-multiple-empty-lines", rule, {
valid: [
{
code: "// valid 1\nvar a = 5;\nvar b = 3;\n\n",
options: [{ max: 1 }]
},
{
code: "// valid 2\n\nvar a = 5;\n\nvar b = 3;",
options: [{ max: 1 }]
},
{
code: "// valid 3\nvar a = 5;\n\nvar b = 3;\n\n\n",
options: [{ max: 2 }]
},
{
code: "// valid 4\nvar a = 5,\n b = 3;",
options: [{ max: 2 }]
},
{
code: "// valid 5\nvar a = 5;\n\n\n\n\nvar b = 3;\n\n\n\n\n",
options: [{ max: 4 }]
},
{
code: "// valid 6\nvar a = 5;\n/* comment */\nvar b = 5;",
options: [{ max: 0 }]
},
{
code: "// valid 7\nvar a = 5;\n",
options: [{ max: 0 }]
},
{
code: "// valid 8\nvar a = 5;\n",
options: [{ max: 0, maxEOF: 0 }]
},
{
code: "// valid 9\nvar a = 1;\n\n",
options: [{ max: 2, maxEOF: 1 }]
},
{
code: "// valid 10\nvar a = 5;\n",
options: [{ max: 0, maxBOF: 0 }]
},
{
code: "\n// valid 11\nvar a = 1;\n",
options: [{ max: 2, maxBOF: 1 }]
},
{
code: "// valid 12\r\n// windows line endings\r\nvar a = 5;\r\nvar b = 3;\r\n\r\n",
options: [{ max: 1 }]
},
// template strings
{
code: "// valid 12\nx = `\n\n\n\nhi\n\n\n\n`",
options: [{ max: 2 }],
languageOptions: { ecmaVersion: 6 }
},
{
code: "// valid 13\n`\n\n`",
options: [{ max: 0 }],
languageOptions: { ecmaVersion: 6 }
},
{
code: "// valid 14\nvar a = 5;`\n\n\n\n\n`",
options: [{ max: 0, maxEOF: 0 }],
languageOptions: { ecmaVersion: 6 }
},
{
code: "`\n\n\n\n\n`\n// valid 15\nvar a = 5;",
options: [{ max: 0, maxBOF: 0 }],
languageOptions: { ecmaVersion: 6 }
},
{
code: "\n\n\n\n// valid 16\nvar a = 5;\n",
options: [{ max: 0, maxBOF: 4 }]
},
{
code: "// valid 17\nvar a = 5;\n\n",
options: [{ max: 0, maxEOF: 1 }]
},
{
code: "var a = 5;",
options: [{ max: 1 }]
}
],
invalid: [
{
code: "// invalid 1\nvar a = 5;\n\n\nvar b = 3;",
output: "// invalid 1\nvar a = 5;\n\nvar b = 3;",
options: [{ max: 1 }],
errors: [getExpectedError(1)]
},
{
code: "// invalid 2\n\n\n\n\nvar a = 5;",
output: "// invalid 2\n\n\nvar a = 5;",
options: [{ max: 2 }],
errors: [getExpectedError(2)]
},
{
code: "// invalid 3\nvar a = 5;\n\n\n\n",
output: "// invalid 3\nvar a = 5;\n\n\n",
options: [{ max: 2 }],
errors: [getExpectedErrorEOF(2)]
},
{
code: "// invalid 4\nvar a = 5;\n \n \n \n",
output: "// invalid 4\nvar a = 5;\n \n \n",
options: [{ max: 2 }],
errors: [getExpectedErrorEOF(2)]
},
{
code: "// invalid 5\nvar a=5;\n\n\n\nvar b = 3;",
output: "// invalid 5\nvar a=5;\n\n\nvar b = 3;",
options: [{ max: 2 }],
errors: [getExpectedError(2)]
},
{
code: "// invalid 6\nvar a=5;\n\n\n\nvar b = 3;\n",
output: "// invalid 6\nvar a=5;\n\n\nvar b = 3;\n",
options: [{ max: 2 }],
errors: [getExpectedError(2)]
},
{
code: "// invalid 7\nvar a = 5;\n\n\n\nb = 3;\nvar c = 5;\n\n\n\nvar d = 3;",
output: "// invalid 7\nvar a = 5;\n\n\nb = 3;\nvar c = 5;\n\n\nvar d = 3;",
options: [{ max: 2 }],
errors: 2
},
{
code: "// invalid 8\nvar a = 5;\n\n\n\n\n\n\n\n\n\n\n\n\n\nb = 3;",
output: "// invalid 8\nvar a = 5;\n\n\nb = 3;",
options: [{ max: 2 }],
errors: [getExpectedError(2)]
},
{
code: "// invalid 9\nvar a=5;\n\n\n\n\n",
output: "// invalid 9\nvar a=5;\n\n\n",
options: [{ max: 2 }],
errors: [getExpectedErrorEOF(2)]
},
{
code: "// invalid 10\nvar a = 5;\n\nvar b = 3;",
output: "// invalid 10\nvar a = 5;\nvar b = 3;",
options: [{ max: 0 }],
errors: [getExpectedError(0)]
},
{
code: "// invalid 11\nvar a = 5;\n\n\n",
output: "// invalid 11\nvar a = 5;\n\n",
options: [{ max: 5, maxEOF: 1 }],
errors: [getExpectedErrorEOF(1)]
},
{
code: "// invalid 12\nvar a = 5;\n\n\n\n\n\n",
output: "// invalid 12\nvar a = 5;\n\n\n\n\n",
options: [{ max: 0, maxEOF: 4 }],
errors: [getExpectedErrorEOF(4)]
},
{
code: "// invalid 13\n\n\n\n\n\n\n\n\nvar a = 5;\n\n\n",
output: "// invalid 13\n\n\n\n\n\n\n\n\nvar a = 5;\n\n",
options: [{ max: 10, maxEOF: 1 }],
errors: [getExpectedErrorEOF(1)]
},
{
code: "// invalid 14\nvar a = 5;\n\n",
output: "// invalid 14\nvar a = 5;\n",
options: [{ max: 2, maxEOF: 0 }],
errors: [getExpectedErrorEOF(0)]
},
{
code: "\n\n// invalid 15\nvar a = 5;\n",
output: "\n// invalid 15\nvar a = 5;\n",
options: [{ max: 5, maxBOF: 1 }],
errors: [getExpectedErrorBOF(1)]
},
{
code: "\n\n\n\n\n// invalid 16\nvar a = 5;\n",
output: "\n\n\n\n// invalid 16\nvar a = 5;\n",
options: [{ max: 0, maxBOF: 4 }],
errors: [getExpectedErrorBOF(4)]
},
{
code: "\n\n// invalid 17\n\n\n\n\n\n\n\n\nvar a = 5;\n",
output: "\n// invalid 17\n\n\n\n\n\n\n\n\nvar a = 5;\n",
options: [{ max: 10, maxBOF: 1 }],
errors: [getExpectedErrorBOF(1)]
},
{
code: "\n// invalid 18\nvar a = 5;\n",
output: "// invalid 18\nvar a = 5;\n",
options: [{ max: 2, maxBOF: 0 }],
errors: [getExpectedErrorBOF(0)]
},
{
code: "\n\n\n// invalid 19\nvar a = 5;\n\n",
output: "// invalid 19\nvar a = 5;\n",
options: [{ max: 2, maxBOF: 0, maxEOF: 0 }],
errors: [getExpectedErrorBOF(0),
getExpectedErrorEOF(0)]
},
{
code: "// invalid 20\r\n// windows line endings\r\nvar a = 5;\r\nvar b = 3;\r\n\r\n\r\n",
output: "// invalid 20\r\n// windows line endings\r\nvar a = 5;\r\nvar b = 3;\r\n\r\n",
options: [{ max: 1 }],
errors: [getExpectedErrorEOF(1)]
},
{
code: "// invalid 21\n// unix line endings\nvar a = 5;\nvar b = 3;\n\n\n",
output: "// invalid 21\n// unix line endings\nvar a = 5;\nvar b = 3;\n\n",
options: [{ max: 1 }],
errors: [getExpectedErrorEOF(1)]
},
{
code:
"'foo';\n" +
"\n" +
"\n" +
"`bar`;\n" +
"`baz`;",
output:
"'foo';\n" +
"\n" +
"`bar`;\n" +
"`baz`;",
options: [{ max: 1 }],
languageOptions: { ecmaVersion: 6 },
errors: [getExpectedError(1)]
},
{
code: "`template ${foo\n\n\n} literal`;",
output: "`template ${foo\n\n} literal`;",
options: [{ max: 1 }],
languageOptions: { ecmaVersion: 6 },
errors: [getExpectedError(1)]
},
{
// https://github.com/eslint/eslint/issues/7893
code: `a\n\n\n\n${"a".repeat(1e5)}`,
output: `a\n\n\n${"a".repeat(1e5)}`,
errors: [getExpectedError(2)]
},
{
// https://github.com/eslint/eslint/issues/8401
code: "foo\n ",
output: "foo\n",
options: [{ max: 1, maxEOF: 0 }],
errors: [getExpectedErrorEOF(0)]
},
{
// https://github.com/eslint/eslint/pull/12594
code: "var a;\n\n\n\n\nvar b;",
output: "var a;\n\nvar b;",
options: [{ max: 1 }],
errors: [{
messageId: "consecutiveBlank",
data: {
max: 1,
pluralizedLines: "line"
},
type: "Program",
line: 3,
column: 1
}]
},
{
// https://github.com/eslint/eslint/pull/12594
code: "var a;\n\n\n\n\nvar b;",
output: "var a;\n\n\nvar b;",
options: [{ max: 2 }],
errors: [{
messageId: "consecutiveBlank",
data: {
max: 2,
pluralizedLines: "lines"
},
type: "Program",
line: 4,
column: 1
}]
}
]
});