#68 Add driverInitializationStage configuration property

Author: YevgeniyShunevych

src/Atata.Configuration.Json/JsonConfig`1.cs

@@ -80,9 +80,8 @@ public DriverJsonSection Driver
 
         /// <summary>
         /// Gets or sets the driver initialization stage.
-        /// The default value is <see cref="AtataContextDriverInitializationStage.Build"/>.
         /// </summary>
-        public AtataContextDriverInitializationStage DriverInitializationStage { get; set; } = AtataContextDriverInitializationStage.Build;
+        public AtataContextDriverInitializationStage? DriverInitializationStage { get; set; }
 
         public List<LogConsumerJsonSection> LogConsumers { get; set; }
 

src/Atata.Configuration.Json/Mapping/JsonConfigMapper.cs

@@ -10,7 +10,8 @@ public static class JsonConfigMapper
         public static AtataContextBuilder Map<TConfig>(TConfig config, AtataContextBuilder builder)
             where TConfig : JsonConfig<TConfig>
         {
-            builder.UseDriverInitializationStage(config.DriverInitializationStage);
+            if (config.DriverInitializationStage != null)
+                builder.UseDriverInitializationStage(config.DriverInitializationStage.Value);
 
             if (config.BaseUrl != null)
                 builder.UseBaseUrl(config.BaseUrl);