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'use strict';
var spawn = require('child_process').spawn;
var path = require('path');
var fs = require('fs');
var baseReporter = require('../../lib/reporters/base');
module.exports = {
/**
* Invokes the mocha binary for the given fixture with color output disabled.
* Accepts an array of additional command line args to pass. The callback is
* invoked with a summary of the run, in addition to its output. The summary
* includes the number of passing, pending, and failing tests, as well as the
* exit code. Useful for testing different reporters.
*
* Example response:
* {
* pending: 0,
* passing: 0,
* failing: 1,
* code: 1,
* output: '...'
* }
*
* @param {string} fixturePath
* @param {array} args
* @param {function} fn
*/
runMocha: function (fixturePath, args, fn) {
var path;
path = resolveFixturePath(fixturePath);
args = args || [];
invokeMocha(args.concat(['-C', path]), function (err, res) {
if (err) return fn(err);
fn(null, getSummary(res));
});
},
/**
* Invokes the mocha binary on the code of the body of the function.
* Accepts an array of additional command line args to pass. The callback is
* invoked with a summary of the run, in addition to its output. The summary
* includes the number of passing, pending, and failing tests, as well as the
* exit code. Useful for testing different reporters.
*
* Example response:
* {
* pending: 0,
* passing: 0,
* failing: 1,
* code: 1,
* output: '...'
* }
*
* @param {function} fixture
* @param {array} args
* @param {function} fn
*/
runMochaFunction: function (fixture, args, fn) {
var path = resolveFixturePath(fixture.name + '.js' || 'tempfile.js');
args = args || [];
var fixtureContent = 'var fn = ' + fixture.toString() + '; fn()';
fs.writeFileSync(path, fixtureContent, 'utf8');
function cleanup () {
fs.unlink(path);
fn.apply(this, arguments);
}
invokeMocha(args.concat(['-C', path]), function (err, res) {
if (err) {
return cleanup(err);
}
cleanup(null, getSummary(res));
});
},
/**
* Invokes the mocha binary for the given fixture using the JSON reporter,
* returning the parsed output, as well as exit code.
*
* @param {string} fixturePath
* @param {array} args
* @param {function} fn
*/
runMochaJSON: function (fixturePath, args, fn) {
var path;
path = resolveFixturePath(fixturePath);
args = args || [];
invokeMocha(args.concat(['--reporter', 'json', path]), function (err, res) {
if (err) return fn(err);
try {
var result = JSON.parse(res.output);
result.code = res.code;
} catch (err) {
return fn(err);
}
fn(null, result);
});
},
/**
* Returns an array of diffs corresponding to exceptions thrown from specs,
* given the plaintext output (-C) of a mocha run.
*
* @param {string} output
* returns {string[]}
*/
getDiffs: function (output) {
var diffs, i, inDiff, inStackTrace;
diffs = [];
output.split('\n').forEach(function (line) {
if (line.match(/^\s{2}\d+\)/)) {
// New spec, e.g. "1) spec title"
diffs.push([]);
i = diffs.length - 1;
inStackTrace = false;
inDiff = false;
} else if (!diffs.length || inStackTrace) {
// Haven't encountered a spec yet
// or we're in the middle of a stack trace
return;
} else if (line.indexOf('+ expected - actual') !== -1) {
inDiff = true;
} else if (line.match(/at Context/)) {
// At the start of a stack trace
inStackTrace = true;
inDiff = false;
} else if (inDiff) {
diffs[i].push(line);
}
});
// Ignore empty lines before/after diff
return diffs.map(function (diff) {
return diff.slice(1, -3).join('\n');
});
},
/**
* regular expression used for splitting lines based on new line / dot symbol.
*/
splitRegExp: new RegExp('[\\n' + baseReporter.symbols.dot + ']+')
};
function invokeMocha (args, fn) {
var output, mocha, listener;
output = '';
args = [path.join('bin', 'mocha')].concat(args);
mocha = spawn(process.execPath, args);
listener = function (data) {
output += data;
};
mocha.stdout.on('data', listener);
mocha.stderr.on('data', listener);
mocha.on('error', fn);
mocha.on('close', function (code) {
fn(null, {
output: output.split('\n').join('\n'),
code: code
});
});
}
function resolveFixturePath (fixture) {
return path.join('./test/integration/fixtures', fixture);
}
function getSummary (res) {
return ['passing', 'pending', 'failing'].reduce(function (summary, type) {
var pattern, match;
pattern = new RegExp(' (\\d+) ' + type + '\\s');
match = pattern.exec(res.output);
summary[type] = (match) ? parseInt(match, 10) : 0;
return summary;
}, res);
}
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