fixed test case by adding the method to keys library

Status Job ID Name Coverage
  Build
passed #115128
build:jdk8

00:01:06

 
  Test
failed #115129
allowed to fail
test

00:01:07

 
  Deploy
passed #115130
allowed to fail
deploy

00:00:48

 
Name Stage Failure
failed
test Test
> There were failing tests. See the report at: file:///builds/xt9634/ProofScriptParser/ui/build/reports/tests/test/index.html

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BUILD FAILED in 53s
ERROR: Job failed: exit code 1