Improve race conditions/MySQL reconnection

[osm/RO.git] / osm_ro / tests / test_utils.py

diff --git a/osm_ro/tests/test_utils.py b/osm_ro/tests/test_utils.py
new file mode 100644 (file)
index 0000000..c3a4e7a
--- /dev/null
+++ b/osm_ro/tests/test_utils.py
@@ -0,0 +1,50 @@
+# -*- coding: utf-8 -*-
+# pylint: disable=E1101
+
+import unittest
+
+from ..utils import get_arg, inject_args
+
+
+class TestUtils(unittest.TestCase):
+    def test_inject_args_curries_arguments(self):
+        fn = inject_args(lambda a=None, b=None: a+b, a=3, b=5)
+        self.assertEqual(fn(), 8)
+
+    def test_inject_args_doesnt_add_arg_if_not_needed(self):
+        fn = inject_args(lambda: 7, a=1, b=2)
+        self.assertEqual(fn(), 7)
+        fn = inject_args(lambda a=None: a, b=2)
+        self.assertEqual(fn(1), 1)
+
+    def test_inject_args_knows_how_to_handle_arg_order(self):
+        fn = inject_args(lambda a=None, b=None: b - a, a=3)
+        self.assertEqual(fn(b=4), 1)
+        fn = inject_args(lambda b=None, a=None: b - a, a=3)
+        self.assertEqual(fn(b=4), 1)
+
+    def test_inject_args_works_as_decorator(self):
+        fn = inject_args(x=1)(lambda x=None: x)
+        self.assertEqual(fn(), 1)
+
+    def test_get_arg__positional(self):
+        def _fn(x, y, z):
+            return x + y + z
+
+        x = get_arg('x', _fn, (1, 3, 4), {})
+        self.assertEqual(x, 1)
+        y = get_arg('y', _fn, (1, 3, 4), {})
+        self.assertEqual(y, 3)
+        z = get_arg('z', _fn, (1, 3, 4), {})
+        self.assertEqual(z, 4)
+
+    def test_get_arg__keyword(self):
+        def _fn(x, y, z=5):
+            return x + y + z
+
+        z = get_arg('z', _fn, (1, 2), {'z': 3})
+        self.assertEqual(z, 3)
+
+
+if __name__ == '__main__':
+    unittest.main()