sorted out running of unittests:

1. removed scrapy.tests.run module which didn't work well because of a problem
   with Twisted trial
2. added runtests.bat script for running tests in windows
3. added additional lookup path for trial in unix systems

bin/runtests.bat

@@ -0,0 +1,19 @@
+@ECHO off
+
+SET test="scrapy"
+IF NOT "%1" == "" SET test="%1"
+
+IF EXIST c:\python26\scripts\trial.py GOTO py26
+IF EXIST c:\python25\scripts\trial.py GOTO py25
+
+ECHO "Unable to run tests: trial command (included with Twisted) not found"
+GOTO end
+
+:py26
+c:\python26\scripts\trial.py %test%
+GOTO end
+
+:py25
+c:\python25\scripts\trial.py %test%
+
+:end

bin/runtests.sh

@@ -3,10 +3,16 @@
 # look for twisted trial command in common known locations
 if [ -x /usr/bin/trial ]; then
     trial="/usr/bin/trial"
+elif [ -x /usr/lib/twisted/bin/trial ]; then
+    trial="/usr/lib/twisted/bin/trial"
 elif [ -x /usr/lib64/twisted/bin/trial ]; then
     trial="/usr/lib64/twisted/bin/trial"
+else
+    echo "Unable to run tests: trial command (included with Twisted) not found"
+    exit 1
 fi
 
+
 # disable custom settings for running tests in a neutral environment
 export SCRAPY_SETTINGS_DISABLED=1
 

scrapy/tests/__init__.py

@@ -1,12 +1,14 @@
 """
 scrapy.tests: this package contains all Scrapy unittests
 
-To run all Scrapy unittests type: 
+To run all Scrapy unittests go to Scrapy main dir and type: 
 
-    python -m scrapy.tests.run
+    bin/runtests.sh
+    
+If you're in windows use runtests.bat instead.
 
 Keep in mind that some tests may be skipped if you don't have some (optional)
-modules available like MySQLdb or simplejson.
+modules available like MySQLdb or simplejson, but that's not a problem.
 """
 
 import os

scrapy/tests/run.py

@@ -1,15 +0,0 @@
-"""
-Module to run Scrapy tests - see scrapy.tests docstring
-"""
-
-if __name__ == '__main__':
-    import os, sys
-    from twisted.trial import runner, reporter
-
-    tests_to_run = sys.argv[1:] or ['scrapy']
-
-    os.environ['SCRAPY_SETTINGS_DISABLED'] = '1'
-    loader = runner.TestLoader()
-    runner = runner.TrialRunner(reporter.TreeReporter)
-    suite = loader.loadByNames(tests_to_run, recurse=True)
-    runner.run(suite)