update scons test and documentations

Author: Tieqiong

README.rst

@@ -87,9 +87,12 @@ An alternative way of installing pyobjcryst is to use the SCons tool,
 which can speed up the process by compiling C++ files in several
 parallel jobs (-j4)::
 
-   scons -j4 dev
+        conda install scons
+        conda install --file requirements/conda.txt
+        scons -j4 dev
 
-See ``scons -h`` for description of build targets and options.
+See ``scons -h`` for description of build targets and options. Need to install test dependencies
+(``requirements/test.txt``) to run SCons test mode.
 
 Optional graphical dependencies for jupyter notebooks
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

src/extensions/SConscript

@@ -39,17 +39,14 @@ env['ENV']['PYTHONPATH'] = Dir('#').abspath + os.sep + 'src'
 test = env.Alias(
     'test',
     ['dev'],
-    Action('python -m pyobjcryst.tests.run')
+    Action('pytest')
 )
 AlwaysBuild(test)
 
 # default targets:
 Default(module_nodes)
 
 # clean up the build artifacts
-Clean(None, ['.sconsign.dblite', 'config.log'])
-Clean(None, Dir('.sconf_temp'))
-Clean(None, Dir('build'))
-Clean(None, installed)
+Clean(module_nodes, installed)
 
 # vim: ft=python