Refactor endpoint tests

Replace force_login calls with login call from client class in setUp

Dockerfile

@@ -1,14 +1,18 @@
 FROM python:3.7-buster
 
+# Run project binaries from the user's local bin folder
+ENV PATH=/home/newsreader/.local/bin:$PATH
+
+# Set the default shell
+RUN useradd -ms /bin/bash newsreader
+
 RUN mkdir /app
 WORKDIR /app
+RUN chown newsreader:newsreader /app
+USER newsreader
 
 # Use a seperate layer for the project requirements
-COPY ./requirements /app/requirements
-RUN pip install -r requirements/dev.txt
+COPY requirements /app/requirements
+RUN pip install --user -r requirements/dev.txt
 
 COPY . /app/
-
-# Set the default shell & add a home dir
-RUN useradd -ms /bin/bash newsreader
-USER newsreader