expect(buildPersistedUserTurnMediaInputsFromFields(undefined)).toEqual([]);

expect(buildPersistedUserTurnMediaInputsFromFields({})).toEqual([]);

});

it("preserves index alignment when an earlier attachment lacks a content type", () => {

// Writer pads missing types with "" to keep MediaPaths/MediaTypes index-aligned.

// The reader must NOT compact those "" holes away before indexing or a later

// attachment's type lands on the wrong attachment.

const result = buildPersistedUserTurnMediaInputsFromFields({

MediaPaths: ["/media/a.bin", "/media/b.png"],

MediaTypes: ["", "image/png"],

});

expect(result).toHaveLength(2);

const [first, second] = result;

// a.bin has no explicit type in the "" hole. Its contentType must NOT be

// "image/png" — that belongs to b.png at index 1.

expect(first).toMatchObject({ path: "/media/a.bin" });

expect(first?.contentType).not.toBe("image/png");

// b.png at index 1 must keep its own type correctly aligned.

expect(second).toEqual({ path: "/media/b.png", contentType: "image/png" });

});

it("preserves index alignment when an earlier attachment lacks a url", () => {

// Same misalignment risk for MediaUrls: a "" hole for a path-only attachment

// must not shift a later attachment's URL to the wrong index.

expect(

buildPersistedUserTurnMediaInputsFromFields({

MediaPaths: ["/media/local.bin", ""],

MediaUrls: ["", "https://example.test/remote.png"],

MediaTypes: ["application/octet-stream", "image/png"],

}),

).toEqual([

// local.bin has a path but no url (the "" was a placeholder, not a real url).

{ path: "/media/local.bin", contentType: "application/octet-stream" },

// remote.png has no path (the "" was a placeholder) but does have a url.

{ url: "https://example.test/remote.png", contentType: "image/png" },

]);

});

});

describe("mergePreparedUserTurnMessageForRuntime", () => {