add PGlite CRUD for user_votes with tests

src/client/features/legislation/lib/user-votes-db.test.ts

@@ -0,0 +1,42 @@
+import { createTestDb } from "@/shared/db/client"
+import type { PGlite } from "@electric-sql/pglite"
+import { beforeEach, describe, expect, it } from "vitest"
+
+let db: PGlite
+
+beforeEach(async () => {
+	db = await createTestDb()
+})
+
+const { getUserVote, saveUserVote, deleteUserVote } = await import(
+	"./user-votes-db"
+)
+
+describe("user-votes-db", () => {
+	it("returns null when no vote exists", async () => {
+		const vote = await getUserVote(db, 1)
+		expect(vote).toBeNull()
+	})
+
+	it("saves and retrieves a vote", async () => {
+		await saveUserVote(db, 1, "ja")
+		const vote = await getUserVote(db, 1)
+		expect(vote).not.toBeNull()
+		expect(vote?.vote).toBe("ja")
+		expect(vote?.legislation_id).toBe(1)
+	})
+
+	it("overwrites an existing vote", async () => {
+		await saveUserVote(db, 1, "ja")
+		await saveUserVote(db, 1, "nein")
+		const vote = await getUserVote(db, 1)
+		expect(vote?.vote).toBe("nein")
+	})
+
+	it("deletes a vote", async () => {
+		await saveUserVote(db, 1, "ja")
+		await deleteUserVote(db, 1)
+		const vote = await getUserVote(db, 1)
+		expect(vote).toBeNull()
+	})
+})