Implemented assert_file_not_in_use

testings/test_open.py

@@ -33,8 +33,6 @@
 files = os.listdir(d)
 corrupt_filenames = [d + f for f in files if f[-4:] in [".sif", ".SIF"]]
 
-corrupt_filenames2 = [THIS_DIR + '/corrupt_data2/tmp.sif']
-
 d = THIS_DIR + "/spool_data/"
 spool_file_dirs = []
 for e in [d + "/data_corrupted/"]:
@@ -51,6 +49,32 @@
         )
 
 
+def assert_file_not_in_use(filename):
+    platform = sys.platform
+    if platform == "linux":
+        widlcard = "/proc/*/fd/*"
+        lfds = glob.glob(widlcard)
+        for fds in lfds:
+            try:
+                file = os.readlink(fds)
+                if file == filename:
+                    return True
+            except OSError as err:
+                if err.errno == 2:     
+                    file = None
+                else:
+                    raise(err)
+        raise ValueError("file is in use.")
+    elif platform == "darwin":
+        raise NotImplementedError('Testing in Mac is not supported.')
+    elif platform == "win32":
+        # for windows:
+        os.rename(filename, filename)
+    else:
+        raise Exception("OS not supported")
+
+
+
 def test_step_and_glue():
     filename = THIS_DIR + "/step_and_glue/step_and_glue.sif"
     with open(filename, "rb") as f:
@@ -194,11 +218,7 @@ def test_corrupt_file(filename):
         data, info = sif_parser.np_open(filename)
 
     # try open with a write mode to make sure the file is closed
-    try:
-        data, info = sif_parser.np_open(filename)
-    except ValueError:
-        with open(filename, 'a') as f:
-            assert f.writable()
+    assert_file_not_in_use(filename)
 
     with pytest.warns(UserWarning, match="corrupt."):
         data, info = sif_parser.np_open(filename, ignore_corrupt=True)
@@ -210,16 +230,6 @@ def test_corrupt_file(filename):
         data = sif_parser.xr_open(filename, ignore_corrupt=True)
 
 
-@pytest.mark.parametrize("filename", corrupt_filenames2)
-def test_corrupt_file2(filename):
-    # try open with a write mode to make sure the file is closed
-    try:
-        data, info = sif_parser.np_open(filename)
-    except (ValueError, SyntaxError):
-        with open(filename, 'a') as f:
-            assert f.writable()
-
-
 @pytest.mark.parametrize(
     ("filename", "raman_wavelength"),
     [