Api Approver is a simple NuGet package built on top of ApprovalTests.Net which approves the public API of an assembly.

Whenever the public API changes the Api Approver test will fail. Running the test manually will pop up a diff tool allowing you to see the changes. If the changes are fine (i.e an added overload) then the changes can simply be approved and test will pass again.

There are times though that changes to the public API is accidental. Api Approver simply adds a step that all public API changes have to be reviewed by a developer and accepted, saving accidental breaking changes being shipped.

Install-package ApiApprover

[Fact]
[UseReporter(typeof(DiffReporter))]
public void my_assembly_has_no_public_api_changes()
{
	PublicApiApprover.ApprovePublicApi(typeof(Application).Assembly.Location);
}

See this example of a more advanced test you can write using this library.