test: add test for issue typeorm#8450

test/github-issues/8450/entity/UserEntity.ts

@@ -0,0 +1,16 @@
+import { Entity } from "../../../../src/decorator/entity/Entity"
+import { PrimaryColumn } from "../../../../src/decorator/columns/PrimaryColumn"
+import { Column } from "../../../../src/decorator/columns/Column"
+
+@Entity("user")
+export class UserEntity {
+    @PrimaryColumn("int")
+    id: number
+
+    @Column({
+        type: "int",
+        generatedType: "STORED",
+        asExpression: "id * 2",
+    })
+    generated: number
+}

test/github-issues/8450/issue-8450.ts

@@ -0,0 +1,38 @@
+import "reflect-metadata"
+import {
+    closeTestingConnections,
+    createTestingConnections,
+    reloadTestingDatabases,
+} from "../../utils/test-utils"
+import { UserEntity } from "./entity/UserEntity"
+import { expect } from "chai"
+import { DataSource } from "../../../src"
+
+describe("github issues > #8450 Generated column not in RETURNING clause on save", () => {
+    let connections: DataSource[]
+
+    before(
+        async () =>
+            (connections = await createTestingConnections({
+                entities: [__dirname + "/entity/*{.js,.ts}"],
+                enabledDrivers: ["postgres", "mysql"],
+            })),
+    )
+    beforeEach(() => reloadTestingDatabases(connections))
+    after(() => closeTestingConnections(connections))
+
+    it("should populate an object with generated column values after saving", () =>
+        Promise.all(
+            connections.map(async (connection) => {
+                const user = new UserEntity()
+                user.id = 100
+
+                expect(user.generated).to.be.undefined
+
+                await connection.manager.save(user)
+
+                expect(user.generated).to.be.a("number")
+                expect(user.generated).to.be.equal(user.id * 2)
+            }),
+        ))
+})