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app/__test__/data/mutation.relation.test.ts

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+// eslint-disable-next-line import/no-unresolved
+import { afterAll, describe, expect, test } from "bun:test";
+import {
+   Entity,
+   EntityManager,
+   ManyToOneRelation,
+   NumberField,
+   SchemaManager,
+   TextField
+} from "../../src/data";
+import { getDummyConnection } from "./helper";
+
+const { dummyConnection, afterAllCleanup } = getDummyConnection();
+afterAll(afterAllCleanup);
+
+describe("Mutator relation", async () => {
+   const connection = dummyConnection;
+   //const connection = getLocalLibsqlConnection();
+   //const connection = getCreds("DB_DATA");
+
+   const posts = new Entity("posts", [
+      new TextField("title"),
+      new TextField("content", { default_value: "..." }),
+      new NumberField("count", { default_value: 0 })
+   ]);
+
+   const users = new Entity("users", [new TextField("username")]);
+
+   const relations = [new ManyToOneRelation(posts, users)];
+
+   const em = new EntityManager([posts, users], connection, relations);
+
+   const schema = new SchemaManager(em);
+   await schema.sync({ force: true });
+
+   test("add users", async () => {
+      const { data } = await em.mutator(users).insertOne({ username: "user1" });
+      await em.mutator(users).insertOne({ username: "user2" });
+
+      // create some posts
+      await em.mutator(posts).insertOne({ title: "post1", content: "content1" });
+
+      // expect to throw
+      expect(em.mutator(posts).insertOne({ title: "post2", users_id: 10 })).rejects.toThrow();
+
+      expect(
+         em.mutator(posts).insertOne({ title: "post2", users_id: data.id })
+      ).resolves.toBeDefined();
+   });
+});