diff --git a/extmod/modtrezorconfig/modtrezorconfig.c b/extmod/modtrezorconfig/modtrezorconfig.c
index 85aad476d..17fb0b5df 100644
--- a/extmod/modtrezorconfig/modtrezorconfig.c
+++ b/extmod/modtrezorconfig/modtrezorconfig.c
@@ -74,9 +74,20 @@ STATIC mp_obj_t mod_TrezorConfig_Config_set(size_t n_args, const mp_obj_t *args)
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_TrezorConfig_Config_set_obj, 4, 4, mod_TrezorConfig_Config_set);
 
+/// def trezor.config.wipe() -> None:
+///     '''
+///     Erases the whole config (use with caution!)
+///     '''
+STATIC mp_obj_t mod_TrezorConfig_Config_wipe(mp_obj_t self) {
+    // TODO
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_TrezorConfig_Config_wipe_obj, mod_TrezorConfig_Config_wipe);
+
 STATIC const mp_rom_map_elem_t mod_TrezorConfig_Config_locals_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_get), MP_ROM_PTR(&mod_TrezorConfig_Config_get_obj) },
     { MP_ROM_QSTR(MP_QSTR_set), MP_ROM_PTR(&mod_TrezorConfig_Config_set_obj) },
+    { MP_ROM_QSTR(MP_QSTR_wipe), MP_ROM_PTR(&mod_TrezorConfig_Config_wipe_obj) },
 };
 STATIC MP_DEFINE_CONST_DICT(mod_TrezorConfig_Config_locals_dict, mod_TrezorConfig_Config_locals_dict_table);
 
diff --git a/src/tests/test_trezor.config.py b/src/tests/test_trezor.config.py
new file mode 100644
index 000000000..d019b2a23
--- /dev/null
+++ b/src/tests/test_trezor.config.py
@@ -0,0 +1,29 @@
+import sys
+sys.path.append('..')
+sys.path.append('../lib')
+import unittest
+
+from trezor import config
+from trezor.crypto import random
+
+class TestConfig(unittest.TestCase):
+
+    def test_set_get(self):
+        config.wipe()
+        for _ in range(128):
+           appid, key = random.uniform(256), random.uniform(256)
+           value = random.bytes(128)
+           config.set(appid, key, value)
+           value2 = config.get(appid, key)
+           self.assertEqual(value, value2)
+
+    def test_get_default(self):
+        config.wipe()
+        for _ in range(128):
+           appid, key = random.uniform(256), random.uniform(256)
+           value = random.bytes(128)
+           value2 = config.get(appid, key, value)
+           self.assertEqual(value, value2)
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/src/tests/test_trezor.debug.py b/src/tests/test_trezor.debug.py
new file mode 100644
index 000000000..d1253ff6b
--- /dev/null
+++ b/src/tests/test_trezor.debug.py
@@ -0,0 +1,16 @@
+import sys
+sys.path.append('..')
+sys.path.append('../lib')
+import unittest
+
+from trezor import debug
+
+class TestDebug(unittest.TestCase):
+
+    def test_memaccess(self):
+        data = debug.memaccess(0, 1024)
+        # don't access contents (will segfault), just the length of the returned data
+        self.assertEqual(len(data), 1024)
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/src/tests/test_trezor.utils.py b/src/tests/test_trezor.utils.py
new file mode 100644
index 000000000..8a2e5b81c
--- /dev/null
+++ b/src/tests/test_trezor.utils.py
@@ -0,0 +1,19 @@
+import sys
+sys.path.append('..')
+sys.path.append('../lib')
+import unittest
+
+from trezor import utils
+
+class TestUtils(unittest.TestCase):
+
+    def test_chunks(self):
+        c = list(utils.chunks(range(100), 7))
+        for i in range(15):
+            # need to check start, stop, step attrs until https://github.com/micropython/micropython/issues/2600 is resolved
+            self.assertEqual(c[i].start, i * 7)
+            self.assertEqual(c[i].stop, 100 if (i == 14) else (i + 1) * 7)
+            self.assertEqual(c[i].step, 1)
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/src/trezor/config.py b/src/trezor/config.py
index 1c09959f4..a342d040b 100644
--- a/src/trezor/config.py
+++ b/src/trezor/config.py
@@ -41,4 +41,7 @@ def get(app_id, key, default=None):
 def set(app_id, key, value):
     _mock[(app_id << 8) | key] = value
     _save()
-    return True
+
+def wipe():
+    _mock = {}
+    _save()
diff --git a/src/trezor/config.py.real b/src/trezor/config.py.real
index 641ce9ce5..471f64435 100644
--- a/src/trezor/config.py.real
+++ b/src/trezor/config.py.real
@@ -8,3 +8,6 @@ def get(app, key, default=None):
 
 def set(app, key, value):
     return _config.set(app, key, value)
+
+def wipe():
+    return _config.wipe()