grunt task src filtering from cli - node.js

Question

I have a grunt task that runs all of my nodejs server side test files.
grunt.registerTask('serverTest', ['env:test', 'mongoose', 'mochaTest']);
While developing tests I would like to only run the test I'm currently working on. My task is setup to run a list of all test assets in the code base:
mochaTest: {
src: testAssets.tests.server,
options: {
reporter: 'spec'
}
},
I would like to specify a filter parameter at the cli to only select a specific file from testAssets.tests.server which is a big list of tests since it's defined as modules/*/tests/server/**/*.js and returns every test in the code base.
For example if I entered the following at the command line:
grunt serverTest:*fileUnderTest.js
Grunt would filter the testAssets.tests.server and only execute the files that match *fileUnderTest.js
I've read through the documentation and seen a lot of examples but can't figure out how to do this without creating a separate target and specifying the file name in the grunt file.

Answer 1

There's probably a more efficient means but the following code at the start of my gruntfile got the filtering working for me.
// get regex epression from CLI
var expression = grunt.option('filter');
//filter the testAssets.tests.server array
var testFiles = filtered(getGlobbedPaths(testAssets.tests.server),expression);
// test array with regex and return array of matches
var filtered = (function(arr,pattern){
var filtered = [],
i = arr.length,
re = new RegExp(pattern);
while (i--) {
if (re.test(arr[i])) {
filtered.push(arr[i]);
}
}
return filtered;
});
And then the grunt task becomes:
mochaTest: {
src: testFiles,
options: {
reporter: 'spec'
}
}
grunt.registerTask('serverTest', ['env:test', 'mongoose', 'mochaTest']);
So a command line call such as:
grunt serverTest --filter=comment.server.model.tests.js
Will run any test file matching the filter and a command like:
grunt serverTest
Will run all test files in the project
For reference my project is based on meanjs which globs all the paths to files so I run the getGlobbedPaths() function which is defined in config.js to first expand the file path array prior to filtering:
var getGlobbedPaths = function(globPatterns, excludes) {
// URL paths regex
var urlRegex = new RegExp('^(?:[a-z]+:)?\/\/', 'i');
// The output array
var output = [];
// If glob pattern is array so we use each pattern in a recursive way, otherwise we use glob
if (_.isArray(globPatterns)) {
globPatterns.forEach(function(globPattern) {
output = _.union(output, getGlobbedPaths(globPattern, excludes));
});
} else if (_.isString(globPatterns)) {
if (urlRegex.test(globPatterns)) {
output.push(globPatterns);
} else {
glob(globPatterns, {
sync: true
}, function(err, files) {
if (excludes) {
files = files.map(function(file) {
if (_.isArray(excludes)) {
for (var i in excludes) {
file = file.replace(excludes[i], '');
}
} else {
file = file.replace(excludes, '');
}
return file;
});
}
output = _.union(output, files);
});
}
}
return output;
};