$ cat test-stats.scm
(import coop-explorer)
(import srfi-1)

(populate-coop-db! "/home/mario/src/eggs/eggs-5-latest")

(print "Eggs with tests: "
       (length (filter egg-has-tests? (coop-eggs))))

(print "Eggs with tests that depend on the test egg: "
       (length (filter egg-has-tests? (egg-what-test-depends 'test))))

(print "Eggs with tests that do not depend on the test egg: "
       (length (filter (lambda (egg)
                         (and (egg-has-tests? egg)
                              (not (memq 'test (egg-test-dependencies egg)))))
                       (coop-eggs))))

(print "Eggs with tests that don't depend on any egg: "
       (length (filter (lambda (egg)
                         (and (egg-has-tests? egg)
                              (null? (egg-test-dependencies egg))))
                       (coop-eggs))))

(print "Eggs that don't have tests but depend on the test egg: "
       (length (filter (lambda (egg)
                         (and (not (egg-has-tests? egg))
                              (memq 'test (egg-test-dependencies egg))))
                       (coop-eggs))))

(print "Eggs that don't have tests but have test dependencies: "
       (length (filter (lambda (egg)
                         (and (not (egg-has-tests? egg))
                              (not (null? (egg-test-dependencies egg)))))
                       (coop-eggs))))



$ csi -s test-stats.scm
Eggs with tests: 253
Eggs with tests that depend on the test egg: 200
Eggs with tests that do not depend on the test egg: 53
Eggs with tests that don't depend on any egg: 30
Eggs that don't have tests but depend on the test egg: 9
Eggs that don't have tests but have test dependencies: 10