Add edit history data access mock

app/src/api/dataAccess/__mocks__/editHistory.ts

@@ -0,0 +1,67 @@
+import { EditHistoryEntry } from '../../../frontend/models/edit-history-entry';
+import { numDesc } from '../../../helpers';
+
+const mockEditHistory =
+    jest.genMockFromModule('../editHistory') as typeof import('../editHistory') & {
+        __setHistory: (mockHistoryData: EditHistoryEntry[]) => void
+    };
+
+let mockData: EditHistoryEntry[] = [];
+
+mockEditHistory.__setHistory = function(mockHistoryData: EditHistoryEntry[]) {
+    mockData = mockHistoryData;
+};
+
+mockEditHistory.getHistoryAfterId = function(id: string, count: number): Promise<EditHistoryEntry[]> {
+    return Promise.resolve(
+        mockData
+            .filter(x => BigInt(x.revision_id) > BigInt(id))
+            .sort(numDesc(x => BigInt(x.revision_id)))
+            .slice(0, count)
+    );
+};
+
+mockEditHistory.getHistoryBeforeId = function(id: string, count: number): Promise<EditHistoryEntry[]> {
+    return Promise.resolve(
+        mockData
+            .filter(x => BigInt(x.revision_id) < BigInt(id))
+            .sort(numDesc(x => BigInt(x.revision_id)))
+            .slice(0, count)
+    );
+};
+
+mockEditHistory.getLatestHistory = function(count: number): Promise<EditHistoryEntry[]> {
+    return Promise.resolve(
+        mockData
+            .slice(mockData.length - count, mockData.length)
+            .sort(numDesc(x => BigInt(x.revision_id)))
+    );
+};
+
+mockEditHistory.getIdNewerThan = async function(id: string): Promise<string> {
+    const historyAfterId = await mockEditHistory.getHistoryAfterId(id, 1);
+    return historyAfterId[historyAfterId.length - 1]?.revision_id;
+};
+
+mockEditHistory.getIdOlderThan = async function(id: string): Promise<string> {
+    const historyBeforeId = await mockEditHistory.getHistoryBeforeId(id, 1);
+    return historyBeforeId[0]?.revision_id;
+};
+
+const {
+    __setHistory,
+    getHistoryAfterId,
+    getHistoryBeforeId,
+    getLatestHistory,
+    getIdNewerThan,
+    getIdOlderThan
+} = mockEditHistory;
+
+export {
+    __setHistory,
+    getHistoryAfterId,
+    getHistoryBeforeId,
+    getLatestHistory,
+    getIdNewerThan,
+    getIdOlderThan
+};