comment-to-assert

Convert comment to assert function.

const foo = 1;
foo;// => 1

Convert this to:

const foo = 1;
assert.strictEqual(foo, 1);

Syntax

This library support following format.

expression; // => expected value

or

console.log(expression); // => expected value

Special handling:

Error:

throw new Error("message"); // Error: "message"

Promise:

Promise.resolve(1); // => Resolve: 1
Promise.reject(new Error("message")); // => Reject: message

Installation

npm install comment-to-assert

CLI Installation

npm install -g comment-to-assert
comment-to-assert target.js > modify.js

Usage

toAssertFromSource(source : string, options: toAssertFromSourceOptions): string

Return string that transformed source string of arguments.

import {
    toAssertFromSource,
    toAssertFromAST
} from "comment-to-assert"
toAssertFromSource("1;// => 1");// => "assert.equal(1, 1)"

toAssertFromSource only support transform source code. if want to source map, should use toAssertFromAST with own parser and generator.

Options:

• babel: @babel/core option

interface toAssertFromSourceOptions {
    babel?: {
        plugins: string[];
    };
}

toAssertFromAST(AST : object, options: toAssertFromASTOptions): object

Return AST object that transformed AST of arguments.

var AST = parse(`var a = [1];
                          a;// => [1]`);
var resultOfAST = toAssertFromAST(AST);
generate(resultOfAST);
/*
var a = [1];
assert.deepEqual(a, [1]);
*/

Options:

• assertBeforeCallbackName: callback name before assertion
• assertAfterCallbackName: callback name after assertion

export interface toAssertFromASTOptions {
    assertBeforeCallbackName?: string;
    assertAfterCallbackName?: string;
}

1; // => 1
"str"; // => "str"
[1, 2, 3]; // => [1,2,3]
Promise.resolve(1); // => Resolve: 1

to be

beforeCallback("id:0");
assert.strictEqual(1, 1);
afterCallback("id:0");
// => 1
beforeCallback("id:1");
assert.strictEqual("str", "str");
afterCallback("id:1");
// => "str"
beforeCallback("id:2");
assert.deepStrictEqual([1, 2, 3], [1, 2, 3]);
afterCallback("id:2");
// => [1,2,3]
Promise.resolve(Promise.resolve(1)).then(v => {
  beforeCallback("id:3");
  assert.strictEqual(v, 1);
  afterCallback("id:3");
  return v;
}); // => Resolve: 1

Example

See example/

"use strict";
var assert = require("assert");
var toAssertFromSource = require("comment-to-assert").toAssertFromSource;
toAssertFromSource("1;// => 1");// => 'assert.equal(1, 1);'
toAssertFromSource("[1];// => [1]");// => 'assert.deepEqual([1], [1]);'
toAssertFromSource("var foo=1;foo;// => 1");// => 'var foo = 1;\nassert.equal(foo, 1);'

Tests

npm test

Update snapshots if you need.

npm run updateSnapshot

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