public void CustomDataSource_GetValue_ReturnsValuesFromDictionary() { var source = new CustomDataSource(); source.Data["key1"] = "value1"; source.Data["key2"] = "value2"; Assert.AreEqual("value1", source.GetValue("key1")); Assert.AreEqual("value2", source.GetValue("key2")); Assert.IsNull(source.GetValue("key3")); }