Use @builddeps@ in the debian/tests/control file

debian/tests/control

@@ -1,3 +1,3 @@
 Tests: run-tests
 Restrictions: allow-stderr 
-Depends: @, build-essential, fakeroot, wget, dpkg-dev, debhelper, libdb-dev, gettext, libcurl4-gnutls-dev, zlib1g-dev, libbz2-dev, xsltproc, docbook-xsl, docbook-xml, po4a, autotools-dev, autoconf, automake, doxygen, stunnel4, libdb-dev, db-util
+Depends: @, @builddeps@, fakeroot, wget, stunnel4, db-util