public void EnvironmentVariablesSettingsSource_GetValue_DealsWithEffectiveVariables()
{
Environment.SetEnvironmentVariable("envvarTestVariable", "test-value");
var source = new EnvironmentVariablesSettingsSource("envvar");
Assert.Equal("test-value", source.GetValue("TestVariable"));
Assert.Null(source.GetValue("ProgramData")); // This env variable always exists but filtered out by the prefix
}
