These tests require Excel 2013 or later installed on your host machine. They directly compare the results for many operations against Excel directly using Excel Interop. A better name for them might be "Interop Tests".
They also take a very long time to run, as the test matrices get quite complex. For example on my 12-core machine, they run for 15 minutes.
You can run just the "Fast" tests as a smoke test:
PS tests\ExcelFinancialFunctions.ConsoleTests> dotnet build
Microsoft (R) Build Engine version 16.11.0+0538acc04 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.
ExcelFinancialFunctions -> \src\ExcelFinancialFunctions\bin\Debug\netstandard2.0\ExcelFinancialFunctions.dll
ExcelFinancialFunctions.ConsoleTests -> \tests\ExcelFinancialFunctions.ConsoleTests\bin\Debug\net48\ExcelFinancialFunctions.ConsoleTests.dll
Build succeeded.
0 Warning(s)
0 Error(s)
Time Elapsed 00:00:00.75
PS \tests\ExcelFinancialFunctions.ConsoleTests> vstest.console.exe bin\Debug\net48\ExcelFinancialFunctions.ConsoleTests.dll --TestCaseFilter:"Category=Fast"
Microsoft (R) Test Execution Command Line Tool Version 16.11.0
Copyright (c) Microsoft Corporation. All rights reserved.
A total of 1 test files matched the specified pattern.
NUnit Adapter 4.1.0.0: Test execution started
Running selected tests in \tests\ExcelFinancialFunctions.ConsoleTests\bin\Debug\net48\ExcelFinancialFunctions.ConsoleTests.dll
NUnit3TestExecutor discovered 69 of 69 NUnit test cases using Current Discovery mode, Non-Explicit run
Passed RunMatrix("IRR") [912 ms]
...
Test Run Successful.
Total tests: 69
Passed: 69
Total time: 5.2782 Seconds