public static void HasEnvironmentVariable_GivenExistingVariable_ReturnsTrue()
        {
            var env = new EnvironmentVariableProvider();

            var pathVarPresent = env.HasEnvironmentVariable("PATH");

            Assert.IsTrue(pathVarPresent);
        }
        public static void HasEnvironmentVariable_GivenMissingVariable_ReturnsFalse()
        {
            var env = new EnvironmentVariableProvider();

            var notFoundVarPresent = env.HasEnvironmentVariable("THIS_WILL_NOT_BE_FOUND");

            Assert.IsFalse(notFoundVarPresent);
        }