Executing Python unit tests in Parallel Processes (#1558)

* Prepare pyunit tests for parallel and independent execution with pytest/pytest-forked.

* Added forked pytest test executions.

* Added a pytest ini-file

* Corrected pytest settings.

* Adjusting PYTHONPATH.

* Reverted changes required for pytest without modified file search patterns.

(cherry picked from commit 0207b11cfef029f2ed765df3ad983ef47cc0838b)

* Run pyunit tests without '--forked'.

* Deactivate black.

(cherry picked from commit d6b68588d4de26bf94181ea726be969cd09aadf0)

6 files changed, 11 insertions, 43 deletions

diff --git a/testsuite/pyunit/__init__.py b/testsuite/pyunit/__init__.py
index eff53eb2f..e69de29bb 100644
--- a/testsuite/pyunit/__init__.py
+++ b/testsuite/pyunit/__init__.py
@@ -1,14 +0,0 @@
-from unittest import TestSuite
-
-try:
-	from testsuite.pyunit import libghdl, dom
-except ModuleNotFoundError:
-	from pyunit import libghdl, dom
-
-def load_tests(loader, testCases, pattern):
-	suite = TestSuite()
-
-	suite.addTests(loader.loadTestsFromModule(libghdl))
-	suite.addTests(loader.loadTestsFromModule(dom))
-
-	return suite
diff --git a/testsuite/pyunit/dom/__init__.py b/testsuite/pyunit/dom/__init__.py
index 9c103eb6a..e69de29bb 100644
--- a/testsuite/pyunit/dom/__init__.py
+++ b/testsuite/pyunit/dom/__init__.py
@@ -1,13 +0,0 @@
-from unittest import TestSuite
-
-try:
-	from testsuite.pyunit.dom import SimpleEntity
-except ModuleNotFoundError:
-	from pyunit.dom import SimpleEntity
-
-def load_tests(loader, testCases, pattern):
-	suite = TestSuite()
-
-	suite.addTests(loader.loadTestsFromModule(SimpleEntity))
-
-	return suite
diff --git a/testsuite/pyunit/libghdl/__init__.py b/testsuite/pyunit/libghdl/__init__.py
index 4aeab3ec3..e69de29bb 100644
--- a/testsuite/pyunit/libghdl/__init__.py
+++ b/testsuite/pyunit/libghdl/__init__.py
@@ -1,13 +0,0 @@
-from unittest import TestSuite
-
-try:
-	from testsuite.pyunit.libghdl import Initialize
-except ModuleNotFoundError:
-	from pyunit.libghdl import Initialize
-
-def load_tests(loader, testCases, pattern):
-	suite = TestSuite()
-
-	suite.addTests(loader.loadTestsFromModule(Initialize))
-
-	return suite
diff --git a/testsuite/pyunit/pytest.ini b/testsuite/pyunit/pytest.ini
new file mode 100644
index 000000000..e00478651
--- /dev/null
+++ b/testsuite/pyunit/pytest.ini
@@ -0,0 +1,7 @@
+[pytest]
+addopts = -rA
+
+# Don't set 'python_classes = *' otherwise, pytest doesn't search for classes
+# derived from unittest.Testcase
+python_files = *
+python_functions = test_*
diff --git a/testsuite/requirements.txt b/testsuite/requirements.txt
index ce54b669b..f66ab3978 100644
--- a/testsuite/requirements.txt
+++ b/testsuite/requirements.txt
@@ -1,4 +1,7 @@
 -r ../pyGHDL/requirements.txt
 
+pytest>=6.2.1
+pytest-cov>=2.10.1
+
 # Coverage collection
 Coverage>=5.3
diff --git a/testsuite/testsuite.sh b/testsuite/testsuite.sh
index 55c2ff9fb..b1b69a7e2 100755
--- a/testsuite/testsuite.sh
+++ b/testsuite/testsuite.sh
@@ -141,9 +141,7 @@ do_gna () {
 # The Python Unit testsuite: regression testsuite for Python bindings to libghdl
 do_pyunit () {
   gstart "[GHDL - test] pyunit"
-  cd ..
-  PYTHONPATH=$(pwd) python3 -m unittest testsuite.pyunit.libghdl.Initialize
-  cd testsuite
+  PYTHONPATH=$(pwd)/.. python3 -m pytest pyunit
   gend
 }