Merge pull request #162 from notion-dotnet/bfix/161-fix-IPageIcon-parsing

Fix IPageIcon parsing 🐛

Author: KoditkarVedant

Src/Notion.Client/Models/Page/IPageIcon.cs

@@ -1,7 +1,12 @@
-using Newtonsoft.Json;
+using JsonSubTypes;
+using Newtonsoft.Json;
 
 namespace Notion.Client
 {
+    [JsonConverter(typeof(JsonSubtypes), "type")]
+    [JsonSubtypes.KnownSubType(typeof(EmojiObject), "emoji")]
+    [JsonSubtypes.KnownSubType(typeof(FileObject), "file")]
+    [JsonSubtypes.KnownSubType(typeof(FileObject), "external")]
     public interface IPageIcon
     {
         [JsonProperty("type")]

Test/Notion.UnitTests/DatabasesClientTests.cs

@@ -119,6 +119,9 @@ public async Task RetrieveDatabaseAsync()
             {
                 property.Key.Should().Be(property.Value.Name);
             }
+
+            HelperAsserts.IPageIconAsserts(database.Icon);
+            HelperAsserts.FileObjectAsserts(database.Cover);
         }
 
         [Fact]

Test/Notion.UnitTests/HelperAsserts.cs

@@ -0,0 +1,41 @@
+using FluentAssertions;
+using Notion.Client;
+
+namespace Notion.UnitTests
+{
+    public static class HelperAsserts
+    {
+        public static void IPageIconAsserts(IPageIcon icon)
+        {
+            icon.Should().NotBeNull();
+
+            switch (icon)
+            {
+                case EmojiObject emoji:
+                    emoji.Emoji.Should().NotBeNull();
+                    break;
+                case FileObject fileObject:
+                    FileObjectAsserts(fileObject);
+                    break;
+            }
+        }
+
+        public static void FileObjectAsserts(FileObject fileObject)
+        {
+            fileObject.Should().NotBeNull();
+
+            switch (fileObject)
+            {
+                case UploadedFile uploadedFile:
+                    uploadedFile.File.Should().NotBeNull();
+                    uploadedFile.File.Url.Should().NotBeNull();
+                    uploadedFile.File.ExpiryTime.Should().NotBeSameDateAs(default);
+                    break;
+                case ExternalFile externalFile:
+                    externalFile.External.Should().NotBeNull();
+                    externalFile.External.Url.Should().NotBeNull();
+                    break;
+            }
+        }
+    }
+}

Test/Notion.UnitTests/data/databases/DatabaseRetrieveResponse.json

@@ -22,6 +22,17 @@
       "href": null
     }
   ],
+  "icon": {
+    "type": "emoji",
+    "emoji": "🎉"
+  },
+  "cover": {
+    "type": "external",
+    "external": {
+	  	"url": "https://website.domain/images/image.png"
+    }
+  },
+  "url": "https://www.notion.so/668d797c76fa49349b05ad288df2d136",
   "properties": {
     "Tags": {
       "id": "YG~h",