Improve error when service is not a dict

Fixes #127

tests/project_test.py

@@ -1,5 +1,5 @@
 from __future__ import unicode_literals
-from fig.project import Project
+from fig.project import Project, ConfigurationError
 from .testcases import DockerClientTestCase
 
 
@@ -37,6 +37,27 @@ class ProjectTest(DockerClientTestCase):
         self.assertEqual(project.services[0].name, 'db')
         self.assertEqual(project.services[1].name, 'web')
 
+    def test_from_config(self):
+        project = Project.from_config('figtest', {
+            'web': {
+                'image': 'ubuntu',
+            },
+            'db': {
+                'image': 'ubuntu',
+            },
+        }, self.client)
+        self.assertEqual(len(project.services), 2)
+        self.assertEqual(project.get_service('web').name, 'web')
+        self.assertEqual(project.get_service('web').options['image'], 'ubuntu')
+        self.assertEqual(project.get_service('db').name, 'db')
+        self.assertEqual(project.get_service('db').options['image'], 'ubuntu')
+
+    def test_from_config_throws_error_when_not_dict(self):
+        with self.assertRaises(ConfigurationError):
+            project = Project.from_config('figtest', {
+                'web': 'ubuntu',
+            }, self.client)
+
     def test_get_service(self):
         web = self.create_service('web')
         project = Project('test', [web], self.client)