Merged PR 164: File System Class setup fixing tests

## Summary
Attempting to fix a test which seems to be broken when integrated with https://dev.azure.com/ma-dev-uk/PrimAITE/_git/PrimAITE/pullrequest/160

## Test process
*How have you tested this (if applicable)?*

## Checklist
- [x] This PR is linked to a **work item**
- [x] I have performed **self-review** of the code
- [x] I have written **tests** for any new functionality added with this PR
- [ ] I have updated the **documentation** if this PR changes or adds functionality
- [ ] I have written/updated **design docs** if this PR implements new functionality.
- [x] I have run **pre-commit** checks for code style

#1714: fixing minor error in test + adding a check for existing uuid when adding file

Related work items: #1714

src/primaite/simulator/file_system/file_system.py

@@ -69,6 +69,10 @@ class FileSystem(SimComponent):
             folder = self.get_folder_by_id(folder_uuid)
 
         if folder is not None:
+            # check if file with name already exists
+            if folder.get_file_by_name(file_name):
+                raise Exception(f'File with name "{file_name}" already exists.')
+
             file = FileSystemFile(name=file_name, size=size, file_type=file_type)
             folder.add_file(file=file)
         else:
@@ -94,7 +98,12 @@ class FileSystem(SimComponent):
         :param: folder_name: The name of the folder
         :type: folder_name: str
         """
+        # check if folder with name already exists
+        if self.get_folder_by_name(folder_name):
+            raise Exception(f'Folder with name "{folder_name}" already exists.')
+
         folder = FileSystemFolder(name=folder_name)
+
         self.folders[folder.uuid] = folder
         return folder
 
@@ -149,6 +158,10 @@ class FileSystem(SimComponent):
         if file is None:
             raise Exception("File to be moved is None")
 
+        # check if file with name already exists
+        if target_folder.get_file_by_name(file.name):
+            raise Exception(f'Folder with name "{file.name}" already exists.')
+
         # remove file from src
         src_folder.remove_file(file)
 
@@ -179,6 +192,10 @@ class FileSystem(SimComponent):
         if file is None:
             raise Exception("File to be moved is None")
 
+        # check if file with name already exists
+        if target_folder.get_file_by_name(file.name):
+            raise Exception(f'Folder with name "{file.name}" already exists.')
+
         # add file to target
         target_folder.add_file(file)
 

src/primaite/simulator/file_system/file_system_folder.py

@@ -20,14 +20,22 @@ class FileSystemFolder(FileSystemItem):
         """Return a FileSystemFile with the matching id."""
         return self.files.get(file_id)
 
+    def get_file_by_name(self, file_name: str) -> FileSystemFile:
+        """Return a FileSystemFile with the matching id."""
+        return next((f for f in list(self.files) if f.name == file_name), None)
+
     def add_file(self, file: FileSystemFile):
         """Adds a file to the folder list."""
         if file is None or not isinstance(file, FileSystemFile):
             raise Exception(f"Invalid file: {file}")
 
-        # add to list
-        self.files[file.uuid] = file
-        self.size += file.size
+        # check if file with id already exists in folder
+        if file.uuid in self.files:
+            _LOGGER.debug(f"File with id {file.uuid} already exists in folder")
+        else:
+            # add to list
+            self.files[file.uuid] = file
+            self.size += file.size
 
     def remove_file(self, file: Optional[FileSystemFile]):
         """