Reintroduce some tests. A bit of cleanup of mocks.

User object fields made a bit clearer and simple test to
verify user added.

tests/app/main/test_user.py

@@ -0,0 +1,27 @@
+from app.notify_client.user_api_client import User
+
+
+def test_user():
+    user_data = {'id': 1,
+                 'name': 'Test User',
+                 'email_address': 'test@user.gov.uk',
+                 'mobile_number': '+4412341234',
+                 'state': 'pending',
+                 'failed_login_count': 0
+                 }
+    user = User(user_data)
+
+    assert user.id == 1
+    assert user.name == 'Test User'
+    assert user.email_address == 'test@user.gov.uk'
+    assert user.mobile_number == '+4412341234'
+    assert user.state == 'pending'
+
+    # user has three failed logins before being locked
+    assert user.max_failed_login_count == 3
+    assert user.failed_login_count == 0
+    assert not user.is_locked()
+
+    # set failed logins to threshold
+    user.failed_login_count = 3
+    assert user.is_locked()