expect(formatted).toBe("error A | error B");

});

it("dedupes repeated cause messages while preserving deeper distinct causes", () => {

const rootCause = new Error("provider auth lookup failed");

const inner = new Error('No API key found for provider "openai-codex".', { cause: rootCause });

const wrapper = new Error(inner.message, { cause: inner });

expect(formatErrorMessage(wrapper)).toBe(`${inner.message} | ${rootCause.message}`);

});

it("redacts sensitive tokens from formatted error messages", () => {

const token = "sk-abcdefghijklmnopqrstuv";

const formatted = formatErrorMessage(new Error(`Authorization: Bearer ${token}`));