fix: Fix coverage report for application with multiprocessing

.gitignore

@@ -9,7 +9,7 @@
 *$py.class
 *.orig
 example.cfg
-.coverage
+.coverage*
 .idea
 nosetests.xml
 xunit.xml

nose2/plugins/coverage.py

@@ -55,6 +55,7 @@ def __init__(self):
         self.covConfig = (
             self.config.as_str("coverage-config", "").strip() or ".coveragerc"
         )
+        self.covCombine = self.config.as_bool("coverage-combine", False)
 
         group = self.session.pluginargs
         group.add_argument(
@@ -125,8 +126,8 @@ def beforeSummaryReport(self, event):
             # requesting a better fix in nedbat/coveragepy#34
             self.covController.save()
 
-            if self._mpmode:
-                self.covController.combine(strict=True)
+            if self.covCombine or self._mpmode:
+                self.covController.combine(strict=self._mpmode)
 
             percent_coverage = None
 

nose2/tests/functional/support/scenario/coverage_multiprocessing_with_combine/.coveragerc

@@ -0,0 +1,2 @@
+[run]
+concurrency = multiprocessing

nose2/tests/functional/support/scenario/coverage_multiprocessing_with_combine/lib/mod1.py

@@ -0,0 +1,12 @@
+from multiprocessing import Process
+
+
+def method2():
+    return
+
+
+def method():
+    p = Process(method2())
+    p.start()
+    p.join()
+    return True

nose2/tests/functional/support/scenario/coverage_multiprocessing_with_combine/nose2.cfg

@@ -0,0 +1,5 @@
+[coverage]
+always-on = True
+coverage = lib
+coverage-config = .coveragerc
+coverage-combine = True

nose2/tests/functional/support/scenario/coverage_multiprocessing_with_combine/test_lib.py

@@ -0,0 +1,8 @@
+import unittest
+
+from lib.mod1 import method
+
+
+class TestLib(unittest.TestCase):
+    def test1(self):
+        self.assertEqual(method(), True)

nose2/tests/functional/support/scenario/coverage_multiprocessing_without_combine/.coveragerc

@@ -0,0 +1,2 @@
+[run]
+concurrency = multiprocessing

nose2/tests/functional/support/scenario/coverage_multiprocessing_without_combine/lib/mod1.py

@@ -0,0 +1,12 @@
+from multiprocessing import Process
+
+
+def method2():
+    return
+
+
+def method():
+    p = Process(method2())
+    p.start()
+    p.join()
+    return True

nose2/tests/functional/support/scenario/coverage_multiprocessing_without_combine/nose2.cfg

@@ -0,0 +1,4 @@
+[coverage]
+always-on = True
+coverage = lib
+coverage-config = .coveragerc

nose2/tests/functional/support/scenario/coverage_multiprocessing_without_combine/test_lib.py

@@ -0,0 +1,8 @@
+import unittest
+
+from lib.mod1 import method
+
+
+class TestLib(unittest.TestCase):
+    def test1(self):
+        self.assertEqual(method(), True)

nose2/tests/functional/test_coverage.py

@@ -136,3 +136,13 @@ def test_run_coverage_fail_under2(self):
             total_stats=TOTAL_STATS,
             assert_exit_status=1,
         )
+
+    def test_run_coverage_with_combine(self):
+        """Check coverage with combine"""
+        proc = self.runIn("scenario/coverage_multiprocessing_with_combine", "-v")
+        self.assertProcOutputPattern(proc, "lib", r"\s+12\s+0\s+100%")
+
+    def test_run_coverage_without_combine(self):
+        """Check coverage without combine"""
+        proc = self.runIn("scenario/coverage_multiprocessing_without_combine", "-v")
+        self.assertProcOutputPattern(proc, "lib", r"\s+8\s+3\s+62%")