first commit

packages/cloudflare/tests/db/playground-dialect.test.ts

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+import { Kysely } from "kysely";
+import { describe, it, expect } from "vitest";
+
+import { PreviewDODialect } from "../../src/db/do-dialect.js";
+import type { PreviewDBStub } from "../../src/db/do-dialect.js";
+
+/**
+ * Recreates the playground's dummy dialect logic inline to avoid
+ * importing playground.ts which re-exports do-class.ts (cloudflare:workers).
+ */
+function createTestDialect() {
+	const notInitialized: PreviewDBStub = {
+		async query(): Promise<{ rows: Record<string, unknown>[] }> {
+			throw new Error(
+				"Playground database not initialized. " +
+					"Ensure the playground middleware is registered in src/middleware.ts " +
+					"and all requests go through it.",
+			);
+		},
+	};
+	return new PreviewDODialect({ getStub: () => notInitialized });
+}
+
+describe("playground dummy dialect", () => {
+	it("creates a dialect without throwing", () => {
+		const dialect = createTestDialect();
+		expect(dialect).toBeDefined();
+		expect(dialect.createAdapter).toBeTypeOf("function");
+		expect(dialect.createDriver).toBeTypeOf("function");
+		expect(dialect.createQueryCompiler).toBeTypeOf("function");
+	});
+
+	it("throws when a query is executed (no middleware ALS override)", async () => {
+		const dialect = createTestDialect();
+		const db = new Kysely<any>({ dialect });
+
+		await expect(
+			db
+				.selectFrom("users" as any)
+				.selectAll()
+				.execute(),
+		).rejects.toThrow("Playground database not initialized");
+	});
+});