#150: Add configuration options required for repo's tests

- This commit also adds getters in config.py

config.json.example

@@ -8,5 +8,8 @@
   "debug_mode": false,
   "generate_swagger": false,
   "host": "127.0.0.1",
-  "port": "5000"
+  "port": "5000",
+  "test_username": "root",
+  "test_password": "pw",
+  "test_mechanism": "simple"
 }

datagateway_api/common/config.py

@@ -76,6 +76,24 @@ def get_port(self):
         except KeyError:
             sys.exit("Missing config value, port")
 
+    def get_test_username(self):
+        try:
+            return self.config["test_username"]
+        except KeyError:
+            sys.exit("Missing config value, test_username")
+
+    def get_test_password(self):
+        try:
+            return self.config["test_password"]
+        except KeyError:
+            sys.exit("Missing config value, test_password")
+
+    def get_test_mechanism(self):
+        try:
+            return self.config["test_mechanism"]
+        except KeyError:
+            sys.exit("Missing config value, test_mechanism")
+
     def get_icat_properties(self):
         """
         ICAT properties can be retrieved using Python ICAT's client object, however this