test("cleans up the outputs, pagers, and status", () => {
    const notebook = appendCellToNotebook(emptyNotebook, emptyCodeCell);
    const id = notebook.get("cellOrder").first();

    const initialState = makeDocumentRecord({
      filename: "test.ipynb",
      notebook,
      cellPagers: Immutable.Map({
        // Hokey data, we're just expecting it to be cleared
        id: Immutable.List(["a", "b"])
      }),
      transient: Immutable.Map({
        cellMap: Immutable.Map({
          id: Immutable.Map({
            status: "idle"
          })
        })
      })
    });

    const state = reducers(
      initialState,
      actions.sendExecuteRequest({ id, message: {} })
    );

    expect(state.getIn(["transient", "cellMap", id, "status"])).toEqual(
      "queued"
    );

    expect(state.getIn(["cellPagers", id])).toEqual(Immutable.List());
  });

export function fixtureStore(config: JSONObject) {
  const dummyNotebook = buildFixtureNotebook(config);

  const frontendToShell = new Subject();
  const shellToFrontend = new Subject();
  const mockShell = Subject.create(frontendToShell, shellToFrontend);
  const channels = mockShell;

  const kernelRef = createKernelRef();
  const contentRef = createContentRef();

  const initialAppState: AppState = {
    core: makeStateRecord({
      kernelRef,
      entities: makeEntitiesRecord({
        contents: makeContentsRecord({
          byRef: Immutable.Map({
            [contentRef]: makeNotebookContentRecord({
              model: makeDocumentRecord({
                notebook: dummyNotebook,
                savedNotebook:
                  config && config.saved === true
                    ? dummyNotebook
                    : emptyNotebook,
                cellPagers: Immutable.Map(),
                cellFocused:
                  config && config.codeCellCount && config.codeCellCount > 1
                    ? dummyNotebook.get("cellOrder", Immutable.List()).get(1)
                    : null
              }),
              filepath:
                config && config.noFilename ? "" : "dummy-store-nb.ipynb"
            })
          })
        }),
        kernels: makeKernelsRecord({
          byRef: Immutable.Map({
            [kernelRef]: makeRemoteKernelRecord({
              channels,
              status: "not connected"
            })
          })
        })
      })
    }),
    app: makeAppRecord({
      notificationSystem: {
        addNotification: () => {} // most of the time you'll want to mock this
      },
      githubToken: "TOKEN"
    }),
    config: Immutable.Map({
      theme: "light"
    }),
    comms: makeCommsRecord()
  };

  return createStore(rootReducer, initialAppState as any);
}

  | actionTypes.DeleteMetadataField
  | actionTypes.CopyCell
  | actionTypes.CutCell
  | actionTypes.PasteCell
  | actionTypes.ChangeCellType
  | actionTypes.ToggleCellExpansion
  | actionTypes.AcceptPayloadMessage
  | actionTypes.SendExecuteRequest
  | actionTypes.SaveFulfilled
  | actionTypes.RestartKernel
  | actionTypes.ClearAllOutputs
  | actionTypes.SetInCell<any>
  | actionTypes.UnhideAll;

const defaultDocument: NotebookModel = makeDocumentRecord({
  notebook: emptyNotebook
});

export function notebook(
  state: NotebookModel = defaultDocument,
  action: DocumentAction
): RecordOf<DocumentRecordProps> {
  switch (action.type) {
    case actionTypes.TOGGLE_TAG_IN_CELL:
      return toggleTagInCell(state, action);
    case actionTypes.SEND_EXECUTE_REQUEST:
      return sendExecuteRequest(state, action);
    case actionTypes.SAVE_FULFILLED:
      return setNotebookCheckpoint(state);
    case actionTypes.FOCUS_CELL:
      return focusCell(state, action);

//.........这里部分代码省略.........
              // Bring in all the listed records
              .merge(dummyRecords)
              // Set up the base directory
              .set(
                fetchContentFulfilledAction.payload.contentRef,
                makeDirectoryContentRecord({
                  model: makeDirectoryModel({
                    type: "directory",
                    // The listing is all these contents in aggregate
                    items: sorted
                  }),
                  filepath: fetchContentFulfilledAction.payload.filepath,
                  lastSaved:
                    fetchContentFulfilledAction.payload.model.last_modified,
                  created: fetchContentFulfilledAction.payload.model.created,
                  loading: false,
                  saving: false,
                  error: null
                })
              )
          );
        }
        case "notebook": {
          const immutableNotebook = fromJS(
            fetchContentFulfilledAction.payload.model.content
          );

          return state.set(
            fetchContentFulfilledAction.payload.contentRef,
            makeNotebookContentRecord({
              created: fetchContentFulfilledAction.payload.created,
              lastSaved: fetchContentFulfilledAction.payload.lastSaved,
              filepath: fetchContentFulfilledAction.payload.filepath,
              model: makeDocumentRecord({
                notebook: immutableNotebook,
                savedNotebook: immutableNotebook,
                transient: Map({
                  keyPathsForDisplays: Map(),
                  cellMap: Map()
                }),
                cellFocused: immutableNotebook.getIn(["cellOrder", 0])
              }),
              loading: false,
              saving: false,
              error: null
            })
          );
        }
      }

      // NOTE: There are no other content types (at the moment), so we will just
      //       warn and return the current state
      console.warn("Met some content type we don't support");
      return state;
    case actionTypes.CHANGE_FILENAME: {
      const changeFilenameAction = action as actionTypes.ChangeFilenameAction;
      return state.updateIn(
        [changeFilenameAction.payload.contentRef],
        contentRecord =>
          contentRecord.merge({
            filepath: changeFilenameAction.payload.filepath
          })
      );
    }
    case actionTypes.SAVE_FULFILLED: {
      const saveFulfilledAction = action as actionTypes.SaveFulfilled;