private static ConfigurationDiagnosticsOptions SetupOptions()
        {
            var options = new ConfigurationDiagnosticsOptions();

            options.BuildConfigurationKeyMatcher(builder => builder.AddContainsMatcher("ConfigThree"));
            options.Obfuscator = new FixedAsteriskObfuscator();
            return(options);
        }
        public void BuildConfigurationKeyMatcherAssignsToConfigurationKeyMatcher()
        {
            var options = new ConfigurationDiagnosticsOptions();

            options.BuildConfigurationKeyMatcher(builder =>
            {
                builder.Add(new ContainsMatcher("abc"));
            });

            options.ConfigurationKeyMatcher.ShouldNotBeNull();
            options.ConfigurationKeyMatcher.ShouldNotBeOfType <NullMatcher>();
        }