attachment test cases improved

apprise/attachment/base.py

@@ -269,25 +269,26 @@ def exists(self, retrieve_if_missing=True):
         cache = self.template_args['cache']['default'] \
             if self.cache is None else self.cache
 
-        if self.download_path and os.path.isfile(self.download_path) \
-                and cache:
+        try:
+            if self.download_path and os.path.isfile(self.download_path) \
+                    and cache:
 
-            # We have enough reason to look further into our cached content
-            # and verify it has not expired.
-            if cache is True:
-                # return our fixed content as is; we will always cache it
-                return True
+                # We have enough reason to look further into our cached content
+                # and verify it has not expired.
+                if cache is True:
+                    # return our fixed content as is; we will always cache it
+                    return True
 
-            # Verify our cache time to determine whether we will get our
-            # content again.
-            try:
-                age_in_sec = time.time() - os.stat(self.download_path).st_mtime
+                # Verify our cache time to determine whether we will get our
+                # content again.
+                age_in_sec = \
+                    time.time() - os.stat(self.download_path).st_mtime
                 if age_in_sec <= cache:
                     return True
 
-            except (OSError, IOError):
-                # The file is not present
-                pass
+        except (OSError, IOError):
+            # The file is not present
+            pass
 
         return False if not retrieve_if_missing else self.download()
 

apprise/attachment/file.py

@@ -101,7 +101,11 @@ def download(self, **kwargs):
         # Ensure any existing content set has been invalidated
         self.invalidate()
 
-        if not os.path.isfile(self.dirty_path):
+        try:
+            if not os.path.isfile(self.dirty_path):
+                return False
+
+        except OSError:
             return False
 
         if self.max_file_size > 0 and \

test/test_attach_file.py

@@ -89,6 +89,31 @@ def test_file_expiry(tmpdir):
         assert aa.exists()
 
 
+def test_attach_mimetype():
+    """
+    API: AttachFile MimeType()
+
+    """
+    # Simple gif test
+    path = join(TEST_VAR_DIR, 'apprise-test.gif')
+    response = AppriseAttachment.instantiate(path)
+    assert isinstance(response, AttachFile)
+    assert response.path == path
+    assert response.name == 'apprise-test.gif'
+    assert response.mimetype == 'image/gif'
+
+    # Force mimetype
+    response._mimetype = None
+    response.detected_mimetype = None
+
+    assert response.mimetype == 'image/gif'
+
+    response._mimetype = None
+    response.detected_mimetype = None
+    with mock.patch('mimetypes.guess_type', side_effect=TypeError):
+        assert response.mimetype == 'application/octet-stream'
+
+
 def test_attach_file():
     """
     API: AttachFile()
@@ -105,6 +130,18 @@ def test_attach_file():
     # results from cache
     assert response.download()
 
+    with mock.patch('os.path.isfile', side_effect=OSError):
+        assert response.exists() is False
+
+    with mock.patch('os.path.isfile', return_value=False):
+        assert response.exists() is False
+
+    # Test that our file exists
+    assert response.exists() is True
+    response.cache = True
+    # Leverage always-cached flag
+    assert response.exists() is True
+
     # On Windows, it is `file://D%3A%5Ca%5Capprise%5Capprise%5Ctest%5Cvar%5Capprise-test.gif`.  # noqa E501
     # TODO: Review - is this correct?
     path_in_url = urllib.parse.quote(path)
@@ -213,6 +250,13 @@ def test_attach_file():
     aa = AppriseAttachment(location=ContentLocation.HOSTED)
     assert aa.add(path) is False
 
+    response = AppriseAttachment.instantiate(path)
+    assert len(response) > 0
+
+    # Test the inability to get our file size
+    with mock.patch('os.path.getsize', side_effect=(True, OSError)):
+        assert len(response) == 0
+
 
 def test_attach_file_base64():
     """