textlint-tester

Mocha test helper library for textlint rule.

Installation

npm install --save-dev textlint-tester mocha

Usage

1. Write tests by using textlint-tester

import TextLintTester from "textlint-tester";
// a rule for testing
import rule from "textlint-rule-no-todo";
const tester = new TextLintTester();
// ruleName, rule, { valid, invalid }
tester.run("no-todo", rule, {
    valid: [
        "This is ok",
    ],
    invalid: [
        // line, column
        {
            text: "- [ ] string",
            errors: [
                {
                    message: "Found TODO: '- [ ] string'",
                    line: 1,
                    column: 3
                }
            ]
        }
    ]
});

2. Run tests by Mocha

$(npm bin)/mocha test/

TextLintTester

TextLintTester#run has two signatures.

• If you want to test single rule, use first method (TextLintTester#run(ruleName, rule, {valid=[], invalid=[]}))
• If you want to test multiple rules and/or plugins, use second method (TextLintTester#run(testName, testConfig, {valid=[], invalid=[]}))

TextLintTester#run(ruleName, rule, {valid=[], invalid=[]})

• {string} ruleName ruleName is a name of the rule.
• {TextlintRuleCreator} rule rule is textlint rule.

TextLintTester#run(testName, testConfig, {valid=[], invalid=[]})

• {string} testName testName is a name of the test.
• {TestConfig} testConfig testConfig is the configuration object for the test.

TestConfig object

TestConfig is defined as follows:

export declare type TestConfig = {
    plugins?: {
        pluginId: string; // name of plugin
        plugin: TextlintPluginCreator; // textlint plugin
        options?: any; // options for plugin
    }[];
    rules: {
        ruleId: string; // name of rule
        rule: TextlintRuleCreator; // textlint rule
        options?: any; // options for rule
    }[];
};

testConfig object example:

{
    plugins: [
        {
            pluginId: "html",
            plugin: htmlPlugin // = require("textlint-plugin-html")
        }
    ],
    rules: [
        {
            ruleId: "no-todo",
            rule: noTodoRule // = require("textlint-rule-no-todo").default
        },
        {
            ruleId: "max-number-of-lines",
            rule: maxNumberOfLineRule, // = require("textlint-rule-max-number-of-lines")
            options: {
                max: 2
            }
        }
    ]
}

valid object

• {string[]|object[]} valid valid is an array of text which should be passed.
  • You can use object if you want to specify some options. object can have the following properties:
    • {string} text: a text to be linted
    • {string} ext: an extension key. Default: .md (Markdown)
    • {string} inputPath: a test text filePath that prefer to text property
    • {object} options: options to be passed to the rule. Will throw assertion error if testConfig is specified

TypeScript declaration is for valid as follows:

export declare type TesterValid = string | {
    text?: string;
    ext?: string;
    inputPath?: string;
    options?: any;
};

valid object example:

[
    "text",
    { text : "text" },
    {
        text: "text",
        options: {
            "key": "value",
        },
    },
    {
        text: "<p>this sentence is parsed as HTML document.</p>",
        ext: ".html",
    },
]

invalid object

• {object[]} invalid invalid is an array of object which should be failed.
  • object can have the following properties:
    • {string} text: a text to be linted.
    • {string} inputPath: a test text filePath that prefer to text property.
    • {string} output: a fixed text.
    • {string} ext: an extension key.
    • {object[]} errors: an array of error objects which should be raised against the text.
    • {object} options: options to be passed to the rule. Will throw assertion error if testConfig is specified

TypeScript's declaration is as follows:

export declare type TesterInvalid = {
    text?: string;
    output?: string;
    ext?: string;
    inputPath?: string;
    options?: any;
    errors: {
        ruleId?: string;
        index?: number;
        line?: number;
        column?: number;
        message?: string;
        [index: string]: any;
    }[];
};

invalid object example:

[
    {
        text: "text",
        output: "text",
        ext: ".txt",
        errors: [
            {
                messages: "expected message",
                line: 1,
                column: 1
            }
        ]
    }
]

Example

test/example-test.js:

import TextLintTester from "textlint-tester";
// a rule for testing
import rule from "textlint-rule-no-todo";
const tester = new TextLintTester();
// ruleName, rule, { valid, invalid }
tester.run("no-todo", rule, {
    valid: [
        "This is ok",
        {
            // text with options
            text: "This is test",
            options: {
                "key": "value"
            }
        }
    ],
    invalid: [
        // line, column
        {
            text: "- [ ] string",
            errors: [
                {
                    message: "Found TODO: '- [ ] string'",
                    line: 1,
                    column: 3
                }
            ]
        },
        // index
        {
            text: "- [ ] string",
            errors: [
                {
                    message: "Found TODO: '- [ ] string'",
                    index: 2
                }
            ]
        },
        {
            text: "TODO: string",
            options: {"key": "value"},
            errors: [
                {
                    message: "found TODO: 'TODO: string'",
                    line: 1,
                    column: 1
                }
            ]
        },
        {
         text: "TODO: string",
         output: "string", // <= fixed output
         errors: [
             {
                 message: "found TODO: 'TODO: string'",
                 line: 1,
                 column: 1
             }
         ]
        }
    ]
});

See textlint-tester-test.ts or textlint-tester-plugin.ts for concrete examples.

Contributing

1. Fork it!
2. Create your feature branch: git checkout -b my-new-feature
3. Commit your changes: git commit -am 'Add some feature'
4. Push to the branch: git push origin my-new-feature
5. Submit a pull request :D

License

MIT