Align editor export menu test with native metadata

Author: KSemenenko

tests/PrompterOne.Web.UITests.Editor/Editor/EditorFileSaveFlowTests.cs

@@ -117,7 +117,7 @@ public async Task EditorScreen_ExportMenu_WritesNativeMarkdownAndPlainTextFiles(
 
             await page.GetByTestId(UiTestIds.Header.EditorExportNative).ClickAsync();
             var nativeFile = await WaitForSavedFileAsync(page, FilePickerMode);
-            await AssertExportedSourceFileAsync(nativeFile, ExpectedDocumentName);
+            await AssertNativeExportedFileAsync(nativeFile, ExpectedDocumentName);
 
             await page.EvaluateAsync(HarnessResetScript);
 
@@ -169,4 +169,17 @@ private static async Task AssertExportedSourceFileAsync(JsonElement savedFile, s
         await Assert.That(savedFile.GetProperty("hasBlob").GetBoolean()).IsTrue();
         await Assert.That(savedFile.GetProperty("text").GetString()).IsEqualTo(EditedScript);
     }
+
+    private static async Task AssertNativeExportedFileAsync(JsonElement savedFile, string expectedFileName)
+    {
+        var savedText = savedFile.GetProperty("text").GetString() ?? string.Empty;
+
+        await Assert.That(savedFile.GetProperty("mode").GetString()).IsEqualTo(FilePickerMode);
+        await Assert.That(savedFile.GetProperty("fileName").GetString()).IsEqualTo(expectedFileName);
+        await Assert.That(savedFile.GetProperty("pickerCallCount").GetInt32()).IsEqualTo(1);
+        await Assert.That(savedFile.GetProperty("hasBlob").GetBoolean()).IsTrue();
+        await Assert.That(savedText).StartsWith("---");
+        await Assert.That(savedText).Contains(SavedFileTitleLine);
+        await Assert.That(savedText).Contains(EditedScript);
+    }
 }