public void OverrideFromEnvironmentVariables()
{
JObject cfg = JObject.Parse(@"{'A': { 'B': 'default' } }");
Environment.SetEnvironmentVariable("A.B", "override");
EnvironmentVariables.AddOverridesTo(cfg);
var actual = JsonConvert.SerializeObject(cfg, Formatting.None);
Assert.AreEqual("{'A':{'B':'override'}}".Replace("'", "\""), actual);
}