diff --git a/fluxc/src/main/java/org/wordpress/android/fluxc/store/SiteStore.kt b/fluxc/src/main/java/org/wordpress/android/fluxc/store/SiteStore.kt
index 7eb3fdb606..c456cb99be 100644
--- a/fluxc/src/main/java/org/wordpress/android/fluxc/store/SiteStore.kt
+++ b/fluxc/src/main/java/org/wordpress/android/fluxc/store/SiteStore.kt
@@ -109,9 +109,12 @@ import javax.inject.Singleton
 
 /**
  * SQLite based only. There is no in memory copy of mapped data, everything is queried from the DB.
+ *
+ * NOTE: This class needs to be open because it's mocked in android tests in the WPAndroid project.
+ *       TODO: consider adding https://kotlinlang.org/docs/all-open-plugin.html
  */
 @Singleton
-class SiteStore
+open class SiteStore
 @Inject constructor(
     dispatcher: Dispatcher?,
     private val postSqlUtils: PostSqlUtils,
@@ -938,8 +941,11 @@ class SiteStore
 
     /**
      * Obtains the site with the given (local) id and returns it as a [SiteModel].
+     *
+     * NOTE: This method needs to be open because it's mocked in android tests in the WPAndroid project.
+     *       TODO: consider adding https://kotlinlang.org/docs/all-open-plugin.html
      */
-    fun getSiteByLocalId(id: Int): SiteModel? {
+    open fun getSiteByLocalId(id: Int): SiteModel? {
         val result = siteSqlUtils.getSitesWithLocalId(id)
         return if (result.isNotEmpty()) {
             result[0]