@power-doctest/markdown NPM

@power-doctest/markdown

A Markdown parser for power-doctest.

Features

Run doctest for Markdown's CodeBlock.

This is markdown example.
Following code is tested by power-doctest.    


`js` or `javascript` CodeBlock

```js
console.log(1); // => 1
```

Install

Install with npm:

npm install @power-doctest/markdown

Usage

fixtures/example.md:

This Is Markdown

Valid JavaScript Example:

```js
console.log("ok"); // => "ok"
```

Invalid JavaScript Example

```js
const array = [1, 2, 3];
console.log(array); // => [1, 44, 3]
```

Example test code

import fs from "fs";
import path from "path";
import assert from "assert";
import { run } from "@power-doctest/markdown";

describe("run markdown", function() {
    it("is example", () => {
        const markdown = fs.readFileSync(path.join(__dirname, "fixtures/example.md"), "utf-8");
        return run(markdown).then(() => {
            // pass
        }).catch(aggregatedError => {
            assert.strictEqual(aggregatedError.message, "Throw 1 error in 2 code blocks");
            assert.strictEqual(aggregatedError.errors.length, 1);
            const [error] = aggregatedError.errors;
            assert.strictEqual(error.message, `  # default.js:4
  
  assert.deepStrictEqual(array, [1, 44, 3])
                         |      |          
                         |      [1,44,3]   
                         [1,2,3]           
  `)

        });
    });
});

Doctest Control Annotation

@power-doctest/markdown support Doctest Control Annotation as HTML comments.

Disable Doctest: ``

Disable doctest for the codeblock.

This code block is not evaluated.

<!-- doctest:disable -->
```js
console.log(true); // => "not eval"
```

Expected error: ``

If the error is not match the result, throw error.

<!-- doctest:SyntaxError -->
```js
++++++++;
```

Doctest options:``

Pass options to @power-doctest/markdown. The inline options is preferred constructor options.

<!-- doctest:options:{ "runMode": "any" } -->
```js
if (1 === 1) {
    console.log(1); // => 1
} else{
    console.log(2); // => 2
}
```

Metadata: ``

It is useful for testing original behavior.

Attach Metadata to error
 
<!-- doctest:meta:{ "ECMAScript": 2020 } -->
```javascript
typeof 123n; // => "bigint"
```

And errors include meta property

{
    "message": "Throw 1 error in 1 code blocks",
    "errors": [
        {
            "meta": {
                "ECMAScript": 2020
            },
            "message": "Identifier directly after number (1:10)"
        }
    ]
}