Use a volume when running the unit tests instead of copying the source in the image

docker/Dockerfile-tests

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+FROM centos:7
+
+WORKDIR /build
+RUN yum -y update
+RUN yum -y install epel-release yum-utils
+RUN yum-config-manager --add-repo https://kojipkgs.fedoraproject.org/repos-dist/epel7Server-infra/latest/x86_64/
+RUN yum -y install \
+    --nogpgcheck \
+    --setopt=deltarpm=0 \
+    --setopt=install_weak_deps=false \
+    --setopt=tsflags=nodocs \
+    bash \
+    createrepo_c \
+    fedmsg \
+    fedmsg-hub \
+    git \
+    kobo \
+    kobo-rpmlib \
+    libmodulemd \
+    pdc-client \
+    python-backports-ssl_match_hostname \
+    python-dogpile-cache \
+    python-enum34 \
+    python-flask \
+    python-flask-migrate \
+    python-flask-sqlalchemy \
+    python-funcsigs \
+    python-futures \
+    python-koji \
+    python-ldap3 \
+    python-mock \
+    python-pip \
+    python-requests \
+    python-six \
+    python-solv \
+    python-sqlalchemy \
+    # Test-only dependencies
+    python-flake8 \
+    python-mock \
+    python-tox \
+    rpm-build \
+    && yum clean all
+# We currently require a newer versions of these Python packages for the tests
+RUN pip install --upgrade flask-sqlalchemy pytest flake8 tox
+VOLUME /src
+WORKDIR /src
+CMD ["bash", "docker/test.sh"]

docker/test.sh

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+#!/bin/bash
+
+# We install the python-koji RPM but it doesn't register as installed through pip.
+# This hacks keeps tox from install koji from PyPi.
+cp requirements.txt requirements.txt.orig
+sed -i '/koji/d' requirements.txt
+# Delete any leftover compiled Python files
+for dir in module_build_service tests; do
+    find ${dir} -type f \( -name '*.pyc' -or -name '*.pyc' \) -exec rm -f {} \;
+done
+# Since tox seems to ignore `usedevelop` when we have `sitepackages` on, we have to run it manually
+python setup.py develop
+/usr/bin/tox -e flake8,py27
+# After running tox, we can revert back to the original requirements.txt file
+rm -f requirements.txt
+mv requirements.txt.orig requirements.txt