Add E2E tests

test/docker/Dockerfile

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+###############################################################################
+#
+# Copyright 2023, Gothenburg Bit Factory
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+#
+# https://www.opensource.org/licenses/mit-license.php
+#
+###############################################################################
+
+ARG TEST_IMAGE
+
+FROM ${TEST_IMAGE}
+
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN apt-get update && yes | unminimize
+RUN apt-get install -y python3 python3-venv
+RUN update-alternatives --install /usr/bin/python python /usr/bin/python3 10
+
+# Create virtual environment
+WORKDIR /
+RUN python -m venv venv && \
+    /venv/bin/pip install --upgrade pip && \
+    /venv/bin/pip install pytest simpletap
+
+# Store diagnostics
+RUN ( \
+    python --version ; \
+    task diagnostics ; \
+    timew diagnostics ; \
+    /venv/bin/pip freeze ; \
+    ) > diagnostics.txt 2>&1
+
+# Copy on-modify-hook
+ADD . /task-on-modify-hook
+WORKDIR /task-on-modify-hook
+
+# Install on-modify-hook
+RUN mkdir -p ~/.task/hooks
+RUN cp on_modify.py ~/.task/hooks/on-modify.timewarrior
+RUN chmod +x ~/.task/hooks/on-modify.timewarrior
+
+# Run tests
+ENV TASK_USE_PATH=true TIMEW_USE_PATH=true
+CMD [ "bash", "-c", "/venv/bin/pytest /task-on-modify-hook/test/test_on-modify_e2e.py"]