function test( msg, dir, fixtures, assert ) {
	var fpath;
	var f;
	var t;
	var i;

	for ( i = 0; i < fixtures.length; i++ ) {
		f = fixtures[ i ];
		t = testName( msg, f );
		fpath = resolve( dir, f );
		tape( t, testFcn( fpath, assert ) );
	}
}
Run tests against test fixtures.

@private
@param {string} msg - test description
@param {string} dir - fixtures directory
@param {Array<string>} fixtures - list of fixtures
@param {Function} assert - assert function