Add tests with different pytest versions

- change first supported pytest version to 3.0
  (older version do not work anymore)

4 files changed, 33 insertions, 7 deletions

diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index b00f93f..fd71e31 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -104,11 +104,6 @@ jobs:
       run: |
         python -m pyfakefs.tests.all_tests
       shell: bash
-    - name: Run pytest tests
-      run: |
-        export PY_VERSION=${{ matrix.python-version }}
-        $GITHUB_WORKSPACE/.github/workflows/run_pytest.sh
-      shell: bash
     - name: Run performance tests
       run: |
         if [[ '${{ matrix.os  }}' != 'macOS-latest' ]]; then
@@ -117,6 +112,34 @@ jobs:
         fi
       shell: bash
 
+  pytest-test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-2016]
+        python-version: [3.9]
+        pytest-version: [3.0.0, 3.5.1, 4.0.2, 4.5.0, 5.0.1, 5.4.3, 6.0.2, 6.2.5, 7.0.1, 7.1.0]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          pip install -r requirements.txt
+          pip install -U pytest==${{ matrix.pytest-version }}
+          if [[ '${{ matrix.pytest-version }}' == '4.0.2' ]]; then
+             pip install -U attrs==19.1.0
+          fi
+        shell: bash
+      - name: Run pytest tests
+        run: |
+          export PY_VERSION=${{ matrix.python-version }}
+          $GITHUB_WORKSPACE/.github/workflows/run_pytest.sh
+        shell: bash
+
   dependency-check:
     runs-on: ${{ matrix.os }}
     strategy:
diff --git a/CHANGES.md b/CHANGES.md
index 6694bb9..993192f 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -7,6 +7,9 @@ The released versions correspond to PyPi releases.
 * only skip `_pytest.pathlib` in pytest versions where it is actually present
   (see [#669](../../issues/669))
 
+### Infrastructure
+* add tests with different pytest versions
+
 ## [Version 4.5.5](https://pypi.python.org/pypi/pyfakefs/4.5.5) (2022-02-14)
 Bugfix release, needed for compatibility with pytest 7.0.
 
diff --git a/README.md b/README.md
index e5e7254..3b18ec6 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ using convenience functions.
 pyfakefs works with CPython 3.6 and above, on Linux, Windows and OSX 
 (MacOS), and with PyPy3.
 
-pyfakefs works with [PyTest](http://doc.pytest.org) version 2.8.6 or above.
+pyfakefs works with [PyTest](http://doc.pytest.org) version 3.0.0 or above.
 
 pyfakefs will not work with Python libraries that use C libraries to access the
 file system.  This is because pyfakefs cannot patch the underlying C libraries'
diff --git a/docs/intro.rst b/docs/intro.rst
index cf26052..ba7cc9a 100644
--- a/docs/intro.rst
+++ b/docs/intro.rst
@@ -9,7 +9,7 @@ The software under test requires no modification to work with pyfakefs.
 pyfakefs works with CPython 3.6 and above, on Linux, Windows and OSX
 (MacOS), and with PyPy3.
 
-pyfakefs works with `PyTest <doc.pytest.org>`__ version 2.8.6 or above.
+pyfakefs works with `PyTest <doc.pytest.org>`__ version 3.0.0 or above.
 
 Installation
 ------------