Adding Fred unit test

tests/test_fred_fred_view.py

@@ -0,0 +1,30 @@
+""" fred/fred_view.py tests """
+import unittest
+from unittest import mock
+from io import StringIO
+import pandas as pd
+
+# pylint: disable=unused-import
+from gamestonk_terminal.fred.fred_view import get_fred_data  # noqa: F401
+
+fred_data_mock = """
+,GDP
+2019-01-01,21115.309
+2019-04-01,21329.877
+2019-07-01,21540.325
+2019-10-01,21747.394
+2020-01-01,21561.139
+2020-04-01,19520.114
+2020-07-01,21170.252
+2020-10-01,21494.731
+"""
+
+
+class TestFredFredView(unittest.TestCase):
+    @mock.patch("gamestonk_terminal.fred.fred_view.Fred.get_series")
+    def test_get_fred_data(self, mock_get_series):
+        fred_data = pd.read_csv(StringIO(fred_data_mock), header=0, index_col=0)
+
+        mock_get_series.return_value = fred_data
+
+        get_fred_data(["--noplot"], "gdp")