How to use Jasmine/Javascript for anonymous functions - jasmine

Question

I've spent a lot of time trying to figure out how to go inside anonymous functions in jasmine.
Sample of method:
numerateColumns: function (rows) {
rows.each(function () {
var $row = $(this);
$row.children().each(function (index) {
var $cell = $(this);
$cell.addClass('column-' + (index + 1));
});
});
}
Try to test with:
it("[TEST] Should call each method.", function () {
// setup
var rows = {
each: function () {
return {
children: function () {
return {
replaceWith: function () {
return null;
}
};
}
};
}
};
spyOn(rows, 'each').and.callThrough();
// method under test
module.numerateColumns(rows);
// expectations
expect(rows.each).toHaveBeenCalled();
});
But coverage test shows me that code of method is read only in first line (rows.each).
How to force it to read all the code inside (function() {}) ?

Answer 1

Why you want to test jQuery? It works perfectly, if not - some tests probably it will catch before new version publication.
function numerateColumns($rows) {
$rows.each(function() {
var $row = $(this);
$row.children().each(function(index) {
var $cell = $(this);
$cell.addClass('column-' + (index + 1));
});
});
}
describe('Iterate over columns`', function() {
var mockRows
beforeEach(function() {
mockRows = $('<div><div></div></div>')
})
it("calls .each() on passed jQuery collection", function() {
spyOn($, 'each').and.callThrough();
expect($.each).not.toHaveBeenCalled();
numerateColumns(mockRows);
expect($.each).toHaveBeenCalled();
});
it("adds CSS class to each child", function() {
var column = $(mockRows[0]).find('div');
expect(column.hasClass('column-1')).toBeFalsy()
numerateColumns(mockRows);
expect(column.hasClass('column-1')).toBeTruthy()
});
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link href="//safjanowski.github.io/jasmine-jsfiddle-pack/pack/jasmine.css" rel="stylesheet" />
<script src="//safjanowski.github.io/jasmine-jsfiddle-pack/pack/jasmine-2.0.3-concated.js"></script>
What you can test - it is extracted business logic that is independent to jQuery itself.