tests: move tests files into the package

Author: BoboTiG

CHANGELOG

@@ -12,6 +12,7 @@ History:
       - doc: add project_urls to setup.cfg
       - doc: add an example using the multiprocessing module (closes #82)
       - tests: added regression tests for #128 and #135
+      - tests: move tests files into the package
 
 4.0.2   2019/02/23
       - new contributor: foone

tests/bench_bgra2rgb.py renamed to mss/tests/bench_bgra2rgb.py

@@ -43,5 +43,7 @@ def is_travis():
 
 @pytest.fixture(scope="session")
 def raw():
-    with open("tests/res/monitor-1024x768.raw", "rb") as f:
+    here = os.path.dirname(__file__)
+    file = os.path.join(here, "res", "monitor-1024x768.raw")
+    with open(file, "rb") as f:
         yield f.read()