diff --git a/build.gradle b/build.gradle
index 524fa4516a..b0a861e28e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -354,6 +354,7 @@ project('scratchpad') {
         // cyclic-dependency here: implementation project(':ooxml')
 
         testImplementation 'junit:junit:4.13'
+        testImplementation 'org.mockito:mockito-core:3.2.4'
         testImplementation project(path: ':main', configuration: 'tests')
     }