The code has a runtime dependency which is not available in our development environment (and is available in test and prod). It's expensive to actually test for the dependency, and I want to test for the environment instead.

if (isDevEnvironment) {
    // fake it
}
else {
    // actually do it
}

Without using appSettings, what code/technique/test would you use to set isDevEnvironment?

Example answers:

• check machine name (partial or full)
• check for running instance of Visual Studio
• check for environment variable

I'm hoping for a test I hadn't considered.