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+# Tests strategy
+
+This document tries to sum up the tests strategy that has been put in place for gudhi continuous integration.
+
+The aim is to help maintainers to anticipate third parties modifications, updates.
+
+## Builds
+
+### Linux
+
+As all the third parties are already installed (thanks to docker), the compilations has been seperated by categories to be parallelized:
+
+* examples (C++)
+* tests (C++)
+* utils (C++)
+* doxygen (C++ documentation that is available in the artefacts)
+* python (including documentation and code coverage that are available in the artefacts)
+
+(cf. `.circleci/config.yml`)
+
+These build categories are done with and without CGAL, and, with and without Eigen to be sure the users won't be annoyed if a third party is missing.
+
+With CGAL and with Eigen builds are performed inside the docker image `gudhi/ci_for_gudhi` based on `Dockerfile_for_circleci_image` file.
+Without CGAL, and, with or without Eigen builds are performed inside the docker image `gudhi/ci_for_gudhi_wo_cgal` based on `Dockerfile_for_circleci_image_without_cgal` file.
+
+#### Update docker images
+
+C++ third parties installation are done thanks to apt on Ubuntu latest LTS.
+
+Docker images need to be rebuild and push each time `.github/build-requirements`, `.github/test-requirements`, when a new third party is added, when a new CGAL version improves gudhi performances, ...
+
+```bash
+docker build -f Dockerfile_for_circleci_image -t gudhi/ci_for_gudhi:latest .
+docker build -f Dockerfile_for_circleci_image_without_cgal -t gudhi/ci_for_gudhi_wo_cgal:latest .
+docker login # requires some specific rights on https://hub.docker.com/u/gudhi/repository/docker/gudhi
+docker push gudhi/ci_for_gudhi:latest
+docker push gudhi/ci_for_gudhi_wo_cgal:latest
+```
+
+### Windows
+
+The compilations has been seperated by categories to be parallelized, but I don't know why builds are not run in parallel:
+
+* examples (C++)
+* tests (C++)
+* utils (C++)
+* python
+
+Doxygen (C++) is not tested.
+(cf. `.appveyor.yml`)
+
+C++ third parties installation are done thanks to [vcpkg](https://github.com/microsoft/vcpkg/).
+In case of installation issue, check in [vcpkg issues](https://github.com/microsoft/vcpkg/issues).
+
+### OSx
+
+The compilations has been seperated by categories to be parallelized:
+
+* examples (C++)
+* tests (C++)
+* utils (C++)
+* python
+* Doxygen (C++)
+
+(cf. `azure-pipelines.yml`)
+
+C++ third parties installation are done thanks to [brew](https://formulae.brew.sh/formula/).
+In case of installation issue, check in formula issues.
+
+## Pip packaging
+
+Pip packaging is done in 2 parts:
+
+* on push and pull requests, the wheels are built (pip package dry-run)
+* on releases, the wheels are built and sent to pypi.org (package)
+
+Only the Linux pip package is based on a docker image (`gudhi/pip_for_gudhi` based on `Dockerfile_for_pip` file) to make it faster.
+
+### Update docker image
+
+C++ third parties installation are done thanks to yum on an image based on `quay.io/pypa/manylinux2014_x86_64`.
+
+Docker image need to be rebuild and push each time `.github/build-requirements`, when a new third party is added, when a new CGAL version improves gudhi performances, ...
+As `.github/test-requirements` is not installed, no need to rebuild image when this file is modified.
+
+```bash
+docker build -f Dockerfile_for_pip -t gudhi/pip_for_gudhi:latest .
+docker login # requires some specific rights on https://hub.docker.com/u/gudhi/repository/docker/gudhi
+docker push gudhi/pip_for_gudhi:latest
+```