mat3ra-fixtures 2026.5.5.post0

Fixtures.

Fixtures

A dual repository (JavaScript and Python) containing basic utils for development.

Minimum external dependencies should be used in order to keep the repository lightweight.

1. Overview

This repository contains the fixtures for the common applications, formats, databases that contain data.

2. Usage

2.1. Python

See example test.

The files can be directly accessed through the filesystem, otherwise the content can be extracted by (a shortened) reference ("object path") from the top-level manifest.yml.

from mat3ra.fixtures import get_content_by_reference_path

PATH_IN_MANIFEST = "applications/espresso/v5.4.0/stdin"

content = get_content_by_reference_path(PATH_IN_MANIFEST)
print(content)

2.2. JavaScript/TypeScript

This package can be installed via npm:

npm install @mat3ra/fixtures

The package exports utilities to access the data folder. Only server-side (Node.js) runtime is supported due to having to rely on the filesystem.

Getting the Data Folder Path

You can access the data folder path in several ways:

TypeScript/ES6 Modules:

import { getDataPath, DATA_PATH } from '@mat3ra/fixtures';
import * as fs from 'fs';
import * as path from 'path';

// Using the function
const dataPath = getDataPath();

// Using the constant
const manifestPath = path.join(DATA_PATH, 'applications/espresso/5.4.0/manifest.yml');
const manifest = fs.readFileSync(manifestPath, 'utf-8');

// Using default export
import dataPath from '@mat3ra/fixtures';
const filePath = path.join(dataPath, 'applications/espresso/5.4.0/case-001/pw-scf.in');

CommonJS:

const { getDataPath, DATA_PATH } = require('@mat3ra/fixtures');
const fs = require('fs');
const path = require('path');

// Using the function
const dataPath = getDataPath();

// Using the constant
const manifestPath = path.join(DATA_PATH, 'applications/espresso/5.4.0/manifest.yml');
const manifest = fs.readFileSync(manifestPath, 'utf-8');

Direct Data Folder Access

You can also access the data folder directly using the package exports:

// Access specific files in the data folder
import '@mat3ra/fixtures/data/applications/espresso/5.4.0/manifest.yml';

Utility Functions

The package provides utility functions for common operations:

import {
  readFileFromFixtures,
  getRenderedTemplateFile,
  getTemplateContexts,
} from '@mat3ra/fixtures';

// Read any file from the data folder
const manifest = readFileFromFixtures('applications/espresso/5.4.0/manifest.yml');

// Get a rendered template file (with normalized line endings)
const template = getRenderedTemplateFile('default', 'pw_scf');
console.log(template.name); // 'pw_scf.j2.in'
console.log(template.content); // Template content

// Get all template contexts
const contexts = getTemplateContexts();
// Returns: [{ name: 'default', context: {...} }, { name: 'constrained', context: {...} }]

Example: Reading a File from the Data Folder

import { DATA_PATH } from '@mat3ra/fixtures';
import * as fs from 'fs';
import * as path from 'path';

// Read a manifest file
const manifestPath = path.join(
  DATA_PATH,
  'applications/espresso/5.4.0/manifest.yml'
);
const manifest = fs.readFileSync(manifestPath, 'utf-8');

// Read an input file
const inputPath = path.join(
  DATA_PATH,
  'applications/espresso/5.4.0/case-001/pw-scf.in'
);
const inputContent = fs.readFileSync(inputPath, 'utf-8');

3. Development

3.1. Folder Structure

Here's the folder structure of the repository:

data
├── applications
│   └── espresso
│       └── 5.4.0
│           ├── case-001
│           ├── case-002
│           ├── case-003
│           └── manifest.yml
├── db
└── formats

For each version of the application, there are multiple cases. Each case contains the data that is used for testing. The manifest file is a YAML file that contains the metadata about all the cases.