test-ob-octave: Add missing `provide'

testing/lisp/test-ob-octave.el

@@ -63,3 +63,5 @@
   (org-test-at-id "cc2d82bb-2ac0-45be-a0c8-d1463b86a3ba"
     (org-babel-next-src-block 5)
     (should (equal nil (org-babel-execute-src-block)))))
+
+(provide 'test-ob-octave)