I made the changes as suggested. However i can not get the tests working. 

I need some help with the tests. 

whenever i compile this package i get these errors

phase `unpack' succeeded after 0.0 seconds
starting phase `patch-usr-bin-file'
phase `patch-usr-bin-file' succeeded after 0.0 seconds
starting phase `patch-source-shebangs'
phase `patch-source-shebangs' succeeded after 0.0 seconds
starting phase `patch-generated-file-shebangs'
phase `patch-generated-file-shebangs' succeeded after 0.0 seconds
starting phase `check'
test suite not run
phase `check' succeeded after 0.0 seconds
starting phase `install'
`/tmp/guix-build-emacs-dumb-jump-0.5.2.drv-0/dumb-jump-0.5.2/dumb-jump.el' -> 
`/gnu/store/7rwqglwmjf6dbgfq87n642acp14agwsr-emacs-dumb-jump-0.5.2/share/emacs/site-lisp/guix.d/dumb-jump-0.5.2/dumb-jump.el'
phase `install' succeeded after 0.0 seconds
starting phase `check'
Cannot open load file: No such file or directory, undercover
phase `check' failed after 0.1 seconds
builder for `/gnu/store/sx8j4pi37d8i32m9hraahkbn1m0ckks6-emacs-dumb-jump-0.5.2.drv' failed with exit code 1
@ build-failed /gnu/store/sx8j4pi37d8i32m9hraahkbn1m0ckks6-emacs-dumb-jump-0.5.2.drv - 1 builder for 
`/gnu/store/sx8j4pi37d8i32m9hraahkbn1m0ckks6-emacs-dumb-jump-0.5.2.drv' failed with exit code 1
guix build: error: build failed: build of `/gnu/store/sx8j4pi37d8i32m9hraahkbn1m0ckks6-emacs-dumb-jump-0.5.2.drv' failed