eslint/tests/lib/rules/no-duplicate-imports.js

   1 /**
   2  * @fileoverview Tests for no-duplicate-imports.
   3  * @author Simen Bekkhus
   4  */
   5
   6 "use strict";
   7
   8 //------------------------------------------------------------------------------
   9 // Requirements
  10 //------------------------------------------------------------------------------
  11
  12 const rule = require("../../../lib/rules/no-duplicate-imports"),
  13     { RuleTester } = require("../../../lib/rule-tester");
  14
  15 //------------------------------------------------------------------------------
  16 // Tests
  17 //------------------------------------------------------------------------------
  18
  19 const ruleTester = new RuleTester({ parserOptions: { ecmaVersion: 6, sourceType: "module" } });
  20
  21 ruleTester.run("no-duplicate-imports", rule, {
  22     valid: [
  23         "import os from \"os\";\nimport fs from \"fs\";",
  24         "import { merge } from \"lodash-es\";",
  25         "import _, { merge } from \"lodash-es\";",
  26         "import * as Foobar from \"async\";",
  27         "import \"foo\"",
  28         "import os from \"os\";\nexport { something } from \"os\";",
  29         {
  30             code: "import os from \"os\";\nexport { hello } from \"hello\";",
  31             options: [{ includeExports: true }]
  32         },
  33         {
  34             code: "import os from \"os\";\nexport * from \"hello\";",
  35             options: [{ includeExports: true }]
  36         },
  37         {
  38             code: "import os from \"os\";\nexport { hello as hi } from \"hello\";",
  39             options: [{ includeExports: true }]
  40         },
  41         {
  42             code: "import os from \"os\";\nexport default function(){};",
  43             options: [{ includeExports: true }]
  44         },
  45         {
  46             code: "import { merge } from \"lodash-es\";\nexport { merge as lodashMerge }",
  47             options: [{ includeExports: true }]
  48         }
  49     ],
  50     invalid: [
  51         {
  52             code: "import \"fs\";\nimport \"fs\"",
  53             errors: [{ messageId: "import", data: { module: "fs" }, type: "ImportDeclaration" }]
  54         },
  55         {
  56             code: "import { merge } from \"lodash-es\";import { find } from \"lodash-es\";",
  57             errors: [{ messageId: "import", data: { module: "lodash-es" }, type: "ImportDeclaration" }]
  58         },
  59         {
  60             code: "import { merge } from \"lodash-es\";import _ from \"lodash-es\";",
  61             errors: [{ messageId: "import", data: { module: "lodash-es" }, type: "ImportDeclaration" }]
  62         },
  63         {
  64             code: "export { os } from \"os\";\nexport { something } from \"os\";",
  65             options: [{ includeExports: true }],
  66             errors: [{ messageId: "export", data: { module: "os" }, type: "ExportNamedDeclaration" }]
  67         },
  68         {
  69             code: "import os from \"os\"; export { os as foobar } from \"os\";\nexport { something } from \"os\";",
  70             options: [{ includeExports: true }],
  71             errors: [
  72                 { messageId: "exportAs", data: { module: "os" }, type: "ExportNamedDeclaration" },
  73                 { messageId: "export", data: { module: "os" }, type: "ExportNamedDeclaration" },
  74                 { messageId: "exportAs", data: { module: "os" }, type: "ExportNamedDeclaration" }
  75             ]
  76         },
  77         {
  78             code: "import os from \"os\";\nexport { something } from \"os\";",
  79             options: [{ includeExports: true }],
  80             errors: [{ messageId: "exportAs", data: { module: "os" }, type: "ExportNamedDeclaration" }]
  81         },
  82         {
  83             code: "import os from \"os\";\nexport * from \"os\";",
  84             options: [{ includeExports: true }],
  85             errors: [{ messageId: "exportAs", data: { module: "os" }, type: "ExportAllDeclaration" }]
  86         }
  87     ]
  88 });