tests: adapt the test runner to work with jython

tests/run-tests.py

@@ -70,6 +70,9 b' SKIPPED_STATUS = 80'
 SKIPPED_PREFIX = 'skipped: '
 FAILED_PREFIX  = 'hghave check failed: '
 PYTHON = sys.executable
+IMPL_PATH = 'PYTHONPATH'
+if 'java' in sys.platform:
+    IMPL_PATH = 'JYTHONPATH'
 
 requiredtools = ["python", "diff", "grep", "unzip", "gunzip", "bunzip2", "sed"]
 
@@ -140,6 +143,9 b' def parseargs():'
     parser.set_defaults(**defaults)
     (options, args) = parser.parse_args()
 
+    # jython is always pure
+    options.pure = options.pure or 'java' in sys.platform
+
     if options.with_hg:
         if not (os.path.isfile(options.with_hg) and
                 os.access(options.with_hg, os.X_OK)):
@@ -907,10 +913,10 b' def main():'
         # it, in case external libraries are only available via current
         # PYTHONPATH.  (In particular, the Subversion bindings on OS X
         # are in /opt/subversion.)
-        oldpypath = os.environ.get('PYTHONPATH')
+        oldpypath = os.environ.get(IMPL_PATH)
         if oldpypath:
             pypath.append(oldpypath)
-        os.environ['PYTHONPATH'] = os.pathsep.join(pypath)
+        os.environ[IMPL_PATH] = os.pathsep.join(pypath)
 
     COVERAGE_FILE = os.path.join(TESTDIR, ".coverage")
 
@@ -931,7 +937,7 b' def main():'
     vlog("# Using TESTDIR", TESTDIR)
     vlog("# Using HGTMP", HGTMP)
     vlog("# Using PATH", os.environ["PATH"])
-    vlog("# Using PYTHONPATH", os.environ["PYTHONPATH"])
+    vlog("# Using", IMPL_PATH, os.environ[IMPL_PATH])
 
     try:
         if len(tests) > 1 and options.jobs > 1: