Test-diff NPM | npm.io

Test Diff

Library for writing tests that diff the excepted output with the actual output.

Install

npm install --save test-diff

Usage

A directory structure similar to the following is expected:

.
├── source    # Directory containing the source files/folders
├── output    # Directory containing the actual output of processing the source files/folders
└── check     # Directory containing the expected output

Basically this library will find some files/folders to process, it'll pass them to the output.make function which will do something with them and write its output in the output directory, finally this library will check if the check and output folders match.

import diff from 'test-diff';

diff ({
  source: {
    cwd: path.join ( __dirname, 'source' ), // Path containing the files/folders to parse
    glob: '**' // Glob used to find individual files/folders to parse
  },
  output: {
    cwd: path.join ( __dirname, 'output' ), // Path containing the actual output
    make ( source ) { // Function that generates the output given a relative source file/folder
      // ...
      fs.writeFileSync ( path.join ( OUTPUT, source ), 'your actual output for this file/folder...' );
      // ...
    }
  },
  check: {
    cwd: path.join ( __dirname, 'check' ), // Path containing the expected output
    glob: '**' // Glob used to find individual tests to perform
  }
});

The actual diff is performed via git, so you'll have to have it installed in your system.

You can find more examples here.