tests: add "have" check for dpkg builddeps

Differential Revision: https://phab.mercurial-scm.org/D879

tests/hghave.py

@@ -587,6 +587,13 b' def has_debhelper():'
                           br'to run debian/rules with given parameter')
     return dpkg and dh and dh_py2 and debuild
 
+@check("debdeps",
+       "debian build dependencies (run dpkg-checkbuilddeps in contrib/)")
+def has_debdeps():
+    # just check exit status (ignoring output)
+    path = '%s/../contrib/debian/control' % os.environ['TESTDIR']
+    return matchoutput('dpkg-checkbuilddeps %s' % path, br'')
+
 @check("demandimport", "demandimport enabled")
 def has_demandimport():
     return os.environ.get('HGDEMANDIMPORT') != 'disable'

tests/test-debian-packages.t

@@ -1,4 +1,4 b''
-#require test-repo slow debhelper
+#require test-repo slow debhelper debdeps
 
   $ . "$TESTDIR/helpers-testrepo.sh"
   $ testrepohgenv