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+# integration
+
+This layer is for building installers, and then executing xunit tests that run them and verify that they worked.
+
+## Running tests
+
+The main focus of these tests is to validate behavior in a real environment.
+Depending on who you talk to, these are integration or system-level or end-to-end (E2E) tests.
+They modify machine state so it's strongly recommended *not* to run these tests on your dev box.
+They should be run on a VM instead, where you can easily roll back.
+
+1. Run build.cmd to build everything (the tests will not automatically run).
+1. Copy the build\IntegrationMsi\Debug\netcoreapp3.1 folder to your VM.
+1. Open an elevated command prompt and navigate to the netcoreapp3.1 folder.
+1. Run the runtests.cmd file to run the tests.
+
+You can modify the runtests.cmd to run specific tests.
+For example, the following line runs only the specified test:
+
+> dotnet test --filter WixToolsetTest.BurnE2E.BasicFunctionalityTests.CanInstallAndUninstallSimpleBundle_x86_wixstdba WixToolsetTest.BurnE2E.dll
+
+The VM must have:
+1. x64 .NET Core SDK of 3.1 or later (for the test runner)
+
+## Building with local changes
+
+The current build process will poison your NuGet package cache, so you may have to run the following command to clear it:
+
+> nuget locals all -clear
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