allow specifying sleep-* options as string

either as single value or as range: "3.5", "2.1 - 5.0"

test/test_util.py

@@ -357,6 +357,31 @@ class TestOther(unittest.TestCase):
         with self.assertRaises(exception.StopExtraction):
             expr()
 
+    def test_build_duration_func(self, f=util.build_duration_func):
+        for v in (0, 0.0, "", None, (), []):
+            self.assertIsNone(f(v))
+
+        def test_single(df, v):
+            for _ in range(10):
+                self.assertEqual(df(), v)
+
+        def test_range(df, lower, upper):
+            for __ in range(10):
+                v = df()
+                self.assertGreaterEqual(v, lower)
+                self.assertLessEqual(v, upper)
+
+        test_single(f(3), 3)
+        test_single(f(3.0), 3.0)
+        test_single(f("3"), 3)
+        test_single(f("3.0-"), 3)
+        test_single(f("  3  -"), 3)
+
+        test_range(f((2, 4)), 2, 4)
+        test_range(f([2, 4]), 2, 4)
+        test_range(f("2-4"), 2, 4)
+        test_range(f("  2.0  - 4 "), 2, 4)
+
     def test_extractor_filter(self):
         # empty
         func = util.build_extractor_filter("")