public void EnvironmentVars_IsVariable()
{
// Actual environment vairabl;es
Assert.IsTrue(EnvironmentVars.IsVariable("path"));
Assert.IsTrue(EnvironmentVars.IsVariable("temp"));
Assert.IsTrue(EnvironmentVars.IsVariable("tmp"));
// Handle LillTek built-in variables.
Assert.IsTrue(EnvironmentVars.IsVariable("os"));
Assert.IsTrue(EnvironmentVars.IsVariable("appversion"));
}