center of gravity indicator added

tests/test_indicator_momentum.py

@@ -84,6 +84,11 @@ class TestMomentum(TestCase):
             except Exception as ex:
                 error_analysis(result, CORRELATION, ex)
 
+    def test_cg(self):
+        result = pandas_ta.cg(self.close)
+        self.assertIsInstance(result, Series)
+        self.assertEqual(result.name, 'CG_10')
+
     def test_cmo(self):
         result = pandas_ta.cmo(self.close)
         self.assertIsInstance(result, Series)

tests/test_indicator_momentum_ext.py

@@ -43,6 +43,11 @@ class TestMomentumExtension(TestCase):
         self.assertIsInstance(self.data, DataFrame)
         self.assertEqual(self.data.columns[-1], 'CCI_20_0.015')
 
+    def test_cg_ext(self):
+        self.data.ta.cg(append=True)
+        self.assertIsInstance(self.data, DataFrame)
+        self.assertEqual(self.data.columns[-1], 'CG_10')
+
     def test_cmo_ext(self):
         self.data.ta.cmo(append=True)
         self.assertIsInstance(self.data, DataFrame)