From 9dbfbcbdbb0d78ced80f38f060c1003963fd874f Mon Sep 17 00:00:00 2001
From: Cameron Yick <cameron.yick@yale.edu>
Date: Sun, 24 Dec 2017 13:19:03 -0500
Subject: [PATCH] Fix #44: Raise explicit error when API Key is missing

---
 tests/test_tiingo.py | 11 +++++++++++
 tiingo/api.py        |  5 ++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/tests/test_tiingo.py b/tests/test_tiingo.py
index 26977e5..a2c91f2 100644
--- a/tests/test_tiingo.py
+++ b/tests/test_tiingo.py
@@ -25,6 +25,17 @@ def test_client_repr():
     assert repr(client) == "<TiingoClient(url=\"{}\")>".format(base_url)
 
 
+class TestClient(TestCase):
+
+    def test_api_key_missing_error(self):
+        config = {
+            'api_key': ""
+        }
+        with self.assertRaises(RuntimeError):
+            client = TiingoClient(config=config)
+            assert client
+
+
 # PRICES ENDPOINTS
 class TestTickerPrices(TestCase):
 
diff --git a/tiingo/api.py b/tiingo/api.py
index 2a63e0c..2e2f200 100644
--- a/tiingo/api.py
+++ b/tiingo/api.py
@@ -60,7 +60,10 @@ class TiingoClient(RestClient):
             api_key = self._config['api_key']
         except KeyError:
             api_key = os.environ.get('TIINGO_API_KEY')
-        assert(api_key)
+
+        if not(api_key):
+            raise RuntimeError("Tiingo API Key not provided. Please provide"
+                               " via environment variable or config argument.")
 
         self._headers = {
             'Authorization': "Token {}".format(api_key),