added a test for extractFormants

tests/fave/extract/test_extractFormants.py

@@ -0,0 +1,50 @@
+
+import logging
+import pytest
+import numpy as np
+from fave import extractFormants
+
+def test_mean_stdv():
+    for test_case in provide_valuelist():
+        mean, stdv = extractFormants.mean_stdv(test_case[0])
+
+        assert mean == test_case[1]
+        assert stdv == test_case[2]
+
+def provide_valuelist():
+    return [  
+        [
+            [1, 2, 3, 4],
+            np.mean([1, 2, 3, 4]),
+            np.std([1, 2, 3, 4], ddof=1)
+        ],
+        [
+            [3.5, 2.6, 11.6, 34.66, 2.8, 4.7],
+            np.mean([3.5, 2.6, 11.6, 34.66, 2.8, 4.7]),
+            np.std([3.5, 2.6, 11.6, 34.66, 2.8, 4.7], ddof=1)
+        ],
+        [
+            [],
+            None,
+            None
+        ],
+        [
+            [23, 34, 45, 56, 12, 312, 45, 943, 21, 1, 4, 6, 9, 2],
+            np.mean([23, 34, 45, 56, 12, 312, 45, 943, 21, 1, 4, 6, 9, 2]),
+            np.std([23, 34, 45, 56, 12, 312, 45, 943, 21, 1, 4, 6, 9, 2], ddof=1)
+        ],
+        [
+            [3],
+            np.mean([3]),
+            0
+        ],
+        [
+            [-1],
+            np.mean([-1]),
+            0
+        ]
+
+    ]
+
+
+