rachnerd-test-plugin/gulpfile.js

Workaround for NativeScript to run unit tests located in source code (Angular style guide)

const gulp = require('gulp');
const del = require('del');
const path = require('path');
const watch = require('gulp-watch');
const modifyFile = require('gulp-modify-file');
const rootDir = require('app-root-path').path;
const argv = require('yargs').argv;

const appDir = path.join(rootDir, 'app');
const SPEC_SRC = appDir + '/**/*.spec.js';
const SPEC_DIST = appDir + '/tests/.tmp';

gulp.task('clean:tests', () => {
    return del(appDir + '/tests/.tmp', {force: true});
});

gulp.task('run:tests', ['clean:tests'], () => {
    const specFiles = parseFlag(argv.spec);
    let targetSrc = [SPEC_SRC];
    if (specFiles.length > 0 && specFiles[0] !== '') {
        targetSrc = specFiles.map(specFile => appDir + '/**/*' + specFile + '*.spec.js');
    }
    targetSrc.push('!' + appDir + '/tests/.tmp');
    return (argv.justlaunch !== undefined ? gulp.src(targetSrc) : watch(targetSrc, {ignoreInitial: false}))
        .pipe(modifyFile(relativeRequireFileModifier(appDir)))
        .pipe(gulp.dest(SPEC_DIST));
});

function parseFlag(flagString = '') {
    if (flagString.length > 0) {
        if (flagString[0] === '[') {
            const contentString = flagString.substring(1, flagString.length - 1);
            return contentString.split(',');
        }
    }
    return [flagString];
}

const requirePathPrefix = 'require("';
const requirePathSuffix = '")';

function getPathOfRequire(relativeRequire) {
    return relativeRequire.substring(requirePathPrefix.length, relativeRequire.length - requirePathSuffix.length);
}
/**
 * Converts relative require paths to paths relative to /app prefixed with ~.
 */
function relativeRequireFileModifier(appDir) {
    const relativeRequireRegex = /require\(["']{1}\.+\/[^)]+["']{1}\)/g;
    return (content, filePath) => {
        const relativeRequires = content.match(relativeRequireRegex) || [];
        relativeRequires.forEach((relativeRequire) => {
            const relativePath = getPathOfRequire(relativeRequire);
            const targetFilePath = path.join(filePath, '../', relativePath);
            if(targetFilePath.indexOf(path.sep + 'app') === -1) {
                throw Error('Trying to resolve a path outside the app folder: ' + targetFilePath);
            }
            const relativeToAppPath = targetFilePath
                .substring(appDir.length + 1, targetFilePath.length);

            const relativeToAppRequire = requirePathPrefix + '~/' + relativeToAppPath.replace(/\\/g, '/') + requirePathSuffix;
            content = content.replace(relativeRequire, relativeToAppRequire)
        });
        return content;
    }
}