test: wrap and extend mock-couch for e2e test setups

package.json

@@ -18,7 +18,8 @@
     "test:watch": "jest --watch",
     "test:cov": "jest --coverage",
     "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
-    "test:e2e": "jest --config test/jest.config.js"
+    "test:e2e": "jest --config test/jest.config.js",
+    "postinstall": "patch-package"
   },
   "dependencies": {
     "@nestjs/axios": "^3.0.2",
@@ -54,6 +55,7 @@
     "eslint-plugin-prettier": "^5.1.3",
     "jest": "29.7.0",
     "jest-openapi": "^0.14.2",
+    "patch-package": "^8.0.0",
     "prettier": "^3.2.5",
     "rimraf": "^3.0.2",
     "supertest": "^6.3.4",

patches/mock-couch+0.1.11.patch

@@ -0,0 +1,13 @@
+diff --git a/node_modules/mock-couch/index.js b/node_modules/mock-couch/index.js
+index 952390b..aecb2b3 100644
+--- a/node_modules/mock-couch/index.js
++++ b/node_modules/mock-couch/index.js
+@@ -110,6 +110,8 @@ function MockCouch(server, options) {
+
+   this.addDB = require('./lib/addDB');
+   this.addDoc = require('./lib/addDoc');
++  
++  this._restifyServer = server;
+ }
+ util.inherits(MockCouch, events.EventEmitter);
+

test/mock-couch.ts

@@ -0,0 +1,59 @@
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+import { EntityDoc } from '../src/report-changes/storage/database-changes.service';
+
+const mockCouch = require('mock-couch');
+
+/**
+ * Wrapper for mock-couch to provide typing.
+ * see https://chris-l.github.io/mock-couch/
+ */
+export class MockCouch {
+  private server: any;
+
+  constructor(port?: number) {
+    this.server = mockCouch.createServer();
+
+    this.server._restifyServer.post('/:db/_find', (req: any, res: any) =>
+      this._find(req, res),
+    );
+
+    this.listen(port ?? 5984);
+  }
+
+  listen(port: number): void {
+    this.server.listen(port);
+  }
+
+  close(): void {
+    this.server.close();
+  }
+
+  addDB(dbName: string, docs: any[]) {
+    this.server.addDB(dbName, docs);
+  }
+
+  addDoc(dbName: string, doc: any) {
+    this.server.addDoc(dbName, doc);
+  }
+
+  private _find(req: any, res: any) {
+    const db = this.server.databases[req.params.db];
+    if (!db) {
+      res.send(404, { error: 'not_found', reason: 'no_db_file' });
+      return;
+    }
+
+    let findResults: EntityDoc[] = [];
+
+    const selector = req.body?.selector;
+    if (selector['calculation.id']) {
+      for (const [id, doc] of Object.entries<EntityDoc>(db)) {
+        if (doc['calculation']?.id === selector['calculation.id']['$eq']) {
+          findResults.push(doc);
+        }
+      }
+    }
+
+    res.send(200, { docs: findResults });
+  }
+}