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test(effect): pin empty structuredOutputText in json generate #392

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ThomasK33 merged 1 commit into from
Oct 25, 2026
Merged

test(effect): pin empty structuredOutputText in json generate #392

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23 changes: 23 additions & 0 deletions packages/effect/test/language-model.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -580,6 +580,29 @@ describe("generateObject", () => {
// Plain text calls keep every text part.
expect(text.text).toBe(`{"city":"Bonn","temperature":9}{"city":"Berlin","temperature":21}`);
});

it("decodes an empty structuredOutputText instead of falling back to the text parts", async () => {
// An empty string is a deliberate selection, not "unset": the text parts
// hold valid JSON, but the call must parse "" and fail.
const model = fakeModel({
doGenerate: async () => ({
content: [{ type: "text", text: `{"city":"Berlin","temperature":21}` }],
structuredOutputText: "",
finishReason: { unified: "stop", raw: undefined },
usage: USAGE,
warnings: [],
}),
});

const Weather = Schema.Struct({ city: Schema.String, temperature: Schema.Finite });
const exit = await Effect.runPromiseExit(
Effect.flatMap(service(model), (m) =>
m.generateObject({ prompt: "weather in berlin", schema: Weather }),
),
);

expect(failure(exit).reason).toMatchObject({ _tag: "StructuredOutputError", responseText: "" });
});
});

describe("streamText", () => {
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