chore: add compat test

tests/api/core/database/v4-self-ref-compat.test.api.js

@@ -0,0 +1,50 @@
+'use strict';
+
+// Test an API with all the possible filed types and simple filterings (no deep filtering, no relations)
+const { createStrapiInstance } = require('api-tests/strapi');
+const { createTestBuilder } = require('api-tests/builder');
+
+const builder = createTestBuilder();
+let strapi;
+
+const testCT = {
+  displayName: 'test',
+  singularName: 'test',
+  pluralName: 'tests',
+  kind: 'collectionType',
+  attributes: {
+    children: {
+      type: 'relation',
+      relation: 'manyToMany',
+      target: 'api::test.test',
+      inversedBy: 'parents',
+    },
+    parents: {
+      type: 'relation',
+      relation: 'manyToMany',
+      target: 'api::test.test',
+      inversedBy: 'children', // intentionnaly wrong to validate retro compatibility
+    },
+  },
+};
+
+describe('v4-self-ref-compat', () => {
+  beforeAll(async () => {
+    await builder.addContentType(testCT).build();
+
+    strapi = await createStrapiInstance();
+  });
+
+  afterAll(async () => {
+    await strapi.destroy();
+    await builder.cleanup();
+  });
+
+  test('2 tables are created', async () => {
+    const hasFirstTable = await strapi.db.getConnection().schema.hasTable('tests_children_lnk');
+    const hasSecondTable = await strapi.db.getConnection().schema.hasTable('tests_parents_lnk');
+
+    expect(hasFirstTable).toBe(true);
+    expect(hasSecondTable).toBe(true);
+  });
+});