Add GetValueDictionaryOrEmpty method to use in sibling libraries for capabilities. (#75)

Resolves #15

Author: mialeska

Aquality.Selenium.Core/src/Aquality.Selenium.Core/Aquality.Selenium.Core.xml

@@ -31,6 +31,21 @@ public static IReadOnlyList<T> GetValueListOrEmpty<T>(this ISettingsFile file, s
             return file.IsValuePresent(path) ? file.GetValueList<T>(path) : new List<T>();
         }
 
+        /// <summary>
+        /// Gets dictionary of values from environment\setting file or empty Dictionary if path doesn't exist in file and environment variables.
+        /// Exception will not be thrown.
+        /// Note that each value of dictionary that is present in settings file can be overriden via Environment variable with the same name;
+        /// (e.g. for capability "safebrowsing.enabled" at dictionary path ".driverSettings.chrome.options" you can set environment variable "driverSettings.chrome.options.safebrowsing.enabled")
+        /// </summary>
+        /// <typeparam name="T">Type of a value.</typeparam>
+        /// <param name="file">Settings file.</param>
+        /// <param name="path">Path to a value. Depends on file format, it can be xpath, path etc.</param>
+        /// <returns>Dictionary of values or empty Dictionary.</returns>
+        public static IReadOnlyDictionary<string, T> GetValueDictionaryOrEmpty<T>(this ISettingsFile file, string path)
+        {
+            return file.IsValuePresent(path) ? file.GetValueDictionary<T>(path) : new Dictionary<string, T>();
+        }
+
         /// <summary>
         /// Gets value from environment\setting file or return default of T if path doesn't exist in file and environment variables.
         /// Exception will not be threw.

Aquality.Selenium.Core/src/Aquality.Selenium.Core/Utilities/SettingsFileExtensions.cs

@@ -82,6 +82,29 @@ public void Should_BePossibleTo_GetValueDictionary()
                 "Dictionary of keys and values was received successively");
         }
 
+        [Test]
+        public void Should_BePossibleTo_GetNotEmptyValueDictionary()
+        {
+            var expectedDict = new Dictionary<string, object>
+            {
+                {"intl.accept_languages", "en"},
+                {"profile.default_content_settings.popups", "0"},
+                {"disable-popup-blocking", "true"}
+            };
+            Assert.AreEqual(expectedDict,
+                AddedParamsSettings.GetValueDictionaryOrEmpty<object>(".driverSettings.chrome.options"),
+                "Dictionary of keys and values was received successively");
+        }
+
+        [Test]
+        public void Should_BePossibleTo_GetEmptyValueDictionary()
+        {
+            var expectedDict = new Dictionary<string, object>();
+            Assert.AreEqual(expectedDict,
+                AddedParamsSettings.GetValueDictionaryOrEmpty<object>(".some.absent.path"),
+                "Dictionary of keys and values was not empty");
+        }
+
         [Test]
         [NonParallelizable]
         public void Should_BePossibleTo_OverrideDictionaryOfValues_FromEnvVar()