diff --git a/britney.conf b/britney.conf
index 940e796..827bd1f 100644
--- a/britney.conf
+++ b/britney.conf
@@ -62,7 +62,7 @@ SMOOTH_UPDATES    = badgers
 
 REMOVE_OBSOLETE   = no
 
-ADT_ENABLE        = no
+ADT_ENABLE        = yes
 ADT_DEBUG         = no
 ADT_ARCHES        = amd64 i386
 
diff --git a/tests/__init__.py b/tests/__init__.py
index 6370632..81c0316 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -135,6 +135,11 @@ class TestBase(unittest.TestCase):
     def tearDown(self):
         del self.data
 
+    def restore_config(self, content):
+        """Helper for restoring configuration contents on cleanup."""
+        with open(self.britney_conf, 'w') as fp:
+            fp.write(content)
+
     def run_britney(self, args=[]):
         '''Run britney.
 
diff --git a/tests/test_autopkgtest.py b/tests/test_autopkgtest.py
index d77fabc..6112098 100644
--- a/tests/test_autopkgtest.py
+++ b/tests/test_autopkgtest.py
@@ -31,6 +31,16 @@ class TestAutoPkgTest(TestBase):
     def setUp(self):
         super(TestAutoPkgTest, self).setUp()
 
+        # Mofify configuration according to the test context.
+        with open(self.britney_conf, 'r') as fp:
+            original_config = fp.read()
+        # Disable boottests.
+        new_config = original_config.replace(
+            'BOOTTEST_ENABLE   = yes', 'BOOTTEST_ENABLE   = no')
+        with open(self.britney_conf, 'w') as fp:
+            fp.write(new_config)
+        self.addCleanup(self.restore_config, original_config)
+
         # fake adt-britney script
         self.adt_britney = os.path.join(
             self.data.home, 'auto-package-testing', 'jenkins', 'adt-britney')
diff --git a/tests/test_boottest.py b/tests/test_boottest.py
index 8a588b9..01772e8 100644
--- a/tests/test_boottest.py
+++ b/tests/test_boottest.py
@@ -117,18 +117,19 @@ class TestBoottestEnd2End(TestBase):
 
     def setUp(self):
         super(TestBoottestEnd2End, self).setUp()
-        self.britney_conf = os.path.join(
-            PROJECT_DIR, 'britney.conf')
-        old_config = None
+
+        # Modify shared configuration file.
         with open(self.britney_conf, 'r') as fp:
-            self.old_config = fp.read()
-        config = self.old_config.replace(
+            original_config = fp.read()
+        # Disable autopkgtests.
+        new_config = original_config.replace(
             'ADT_ENABLE        = yes', 'ADT_ENABLE        = no')
         # Disable TouchManifest auto-fetching.
-        config = config.replace(
+        new_config = new_config.replace(
             'BOOTTEST_FETCH    = yes', 'BOOTTEST_FETCH    = no')
         with open(self.britney_conf, 'w') as fp:
-            fp.write(config)
+            fp.write(new_config)
+        self.addCleanup(self.restore_config, original_config)
 
         self.data.add('libc6', False, {'Architecture': 'armhf'}),
 
@@ -147,11 +148,6 @@ class TestBoottestEnd2End(TestBase):
             'pyqt5:armhf 1.0',
         ])
 
-    def tearDown(self):
-        """ Replace the old_config. """
-        with open(self.britney_conf, 'w') as fp:
-            fp.write(self.old_config)
-
     def create_manifest(self, lines):
         """Create a manifest for this britney run context."""
         path = os.path.join(