fix(repository): Move backend code into subdirectory

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

backend/src/utils/test-utils/mockSelectQueryBuilder.ts

@@ -0,0 +1,49 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import { Mock } from 'ts-mockery';
+import { ObjectLiteral, Repository, SelectQueryBuilder } from 'typeorm';
+
+/**
+ * Mocks a {@link SelectQueryBuilder} that returns a given entity.
+ *
+ * @param returnValue The entity to return
+ * @return The mocked query builder
+ */
+export function mockSelectQueryBuilder<T>(
+  returnValue: T | null,
+): SelectQueryBuilder<T> {
+  const mockedQueryBuilder: SelectQueryBuilder<T> = Mock.of<
+    SelectQueryBuilder<T>
+  >({
+    where: () => mockedQueryBuilder,
+    andWhere: () => mockedQueryBuilder,
+    leftJoinAndSelect: () => mockedQueryBuilder,
+    getOne: () => Promise.resolve(returnValue),
+    orWhere: () => mockedQueryBuilder,
+    setParameter: () => mockedQueryBuilder,
+    getMany: () => Promise.resolve(returnValue ? [returnValue] : []),
+  });
+  return mockedQueryBuilder;
+}
+
+/**
+ * Mocks an {@link SelectQueryBuilder} and injects it into the given {@link Repository}.
+ *
+ * @param repository The repository whose query builder function should be mocked
+ * @param returnValue The value that should be found by the query builder
+ * @return The mocked query builder
+ * @see mockSelectQueryBuilder
+ */
+export function mockSelectQueryBuilderInRepo<T extends ObjectLiteral>(
+  repository: Repository<T>,
+  returnValue: T | null,
+): SelectQueryBuilder<T> {
+  const selectQueryBuilder = mockSelectQueryBuilder(returnValue);
+  jest
+    .spyOn(repository, 'createQueryBuilder')
+    .mockImplementation(() => selectQueryBuilder);
+  return selectQueryBuilder;
+}