Spies, the Jasmine implementation for mocks featuring spyOn & spyOnProperty as well as jasmine.createSpy(Obj) and how to inspect calls made.

The basic example contains the general test suite structure and the two most used matchers toBe() (===) and toEqual() (deep compare), followed by all the other matchers that come out of the box.

To finish some helpers for your workflow: how to only have certain tests run and how to exclude tests.

Probably the most widely used JavaScript testing framework.

This tutorial covers installation, configuration and execution only. For the Jasmine syntax, see parts 2 to 4!

Miscellaneous features

EPPlus can do a whole lot more for you. This post covers some interesting stuff that didn’t really fit anywhere else.

IEnumerable objects

Exporting data to an Excel doesn’t get easier than this

using (var package = new ExcelPackage())
{
	var sheet = package.Workbook.Worksheets.Add("IEnumerable");
	var data = new[]
	{
		new {Name = "A", Value = 1},
		new {Name = "B", Value = 2},
		new {Name = "C", Value = 3},
	};
	sheet.Cells["A1"].LoadFromCollection(data);
	sheet.Cells["A1"].SetHeaders("Name", "Value");
	package.SaveAs(new FileInfo(@""));
}

Comparing NSubstitute syntax with Moq, probably the most used mocking framework out there at the moment.

moq/moq4 :

nsubstitute/nsubstitute :

In case your users want to continue working with the Excels after generation.

Not a problem for EPPlus. Instead of calculating values and writing them to an excel, leverage the power of Excel formulas.

Version 4.5.3.3 is the last version of EPPlus you can use without a license for commercial use.
See some alternatives if that is a dealbreaker for you!