style(tests): format all files

tests/app/image-source/image-source-snippet.ts

@@ -14,4 +14,4 @@ export function imageSourceFromAsset(imageAsset) {
         }
     });
 }
-// << imagesource-from-imageasset-save-to
+// << imagesource-from-imageasset-save-to

tests/app/image-source/image-source.md

@@ -53,4 +53,4 @@ The supported formats are `png`, `jpeg`, and `jpg`. The quality parameter is opt
 
 ### Creating PNG image file from base64 string
 The method `fromBase64(source: string): Promise<boolean>` loads this instance from the specified base64 encoded string asynchronously.
-{%snippet imagesource-from-base-string%}
+{%snippet imagesource-from-base-string%}