Stackless issue python#86: Modernize the unittest support classes

Reimplement Stackless/unittests/support.py. The new implementation
is more IDE friendly and requires only a single pass to run all
test with and without soft switching.

Base all tests on StacklessTestCase.
Remove a second call of unittest.main from ```if __name__ ==
"__main__"```-blocks

https://bitbucket.org/stackless-dev/stackless/issues/86
(grafted from 8237bba0d27ab1bdd2cdbfa52c7bdb6f468119a7, 719923b5c638,
06295530c672, 65cff13662f2)

Stackless/unittests/picklebug.py

@@ -7,13 +7,14 @@
 import sys
 import gc
 import pickle as pickle
+import os
 from stackless import *
 
 try:
     genschedoutertest  # @UndefinedVariable
 except NameError:
     try:
-        exec(open("test_pickle.py").read())
+        exec(open(os.path.join(os.path.dirname(__file__), "test_pickle.py")).read())
     except SystemExit:
         pass
 

Stackless/unittests/runAll.py

@@ -5,68 +5,15 @@
 Should be run in the folder Stackless/unittests.
 """
 
-
 import os
-import sys
-import glob
 import unittest
-import stackless
-
-
-def getsoft():
-    hold = stackless.enable_softswitch(False)
-    stackless.enable_softswitch(hold)
-    return hold
-
-
-def makeSuite(target, path=None):
-    "Build a test suite of all available test files."
-
-    suite = unittest.TestSuite()
-    if '.' not in sys.path:
-        sys.path.insert(0, '.')
-
-    pattern = "test_*.py"
-    if path:
-        pattern = os.path.join(path, pattern)
-    for idx, filename in enumerate(glob.glob(pattern)):
-        modname = os.path.splitext(os.path.basename(filename))[0]
-        module = __import__(modname)
-        tests = unittest.TestLoader().loadTestsFromModule(module)
-        use_it = target == 0 or idx + 1 == target
-        if use_it:
-            suite.addTest(tests)
-            if target > 0:
-                print("single test of '%s', switch=%s" %
-                      (filename, ("hard", "soft")[getsoft()]))
-
-    return suite
 
 
 def main():
     path = os.path.split(__file__)[0]
-    hold = stackless.enable_softswitch(True)
-    try:
-        target = int(sys.argv[1])
-    except IndexError:
-        try:
-            target = TARGET  # @UndefinedVariable
-        except NameError:
-            target = 0
-    try:
-        flags = True, False
-        if target:
-            flags = (flags[target > 0],)
-            if abs(target) == 42:
-                target = 0
-        for switch in flags:
-            stackless.enable_softswitch(switch)
-            testSuite = makeSuite(abs(target), path)
-            verbosity = 1
-            # verbosity = 2  # to turn on verbose mode
-            unittest.TextTestRunner(verbosity=verbosity).run(testSuite)
-    finally:
-        stackless.enable_softswitch(hold)
+    print(path)
+    testSuite = unittest.TestLoader().discover(path)
+    unittest.TextTestRunner(verbosity=2).run(testSuite)
 
 if __name__ == '__main__':
     main()