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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { describe, it, expect } from 'vitest';
import {
getResponseText,
getResponseTextFromParts,
getFunctionCalls,
getFunctionCallsFromParts,
getFunctionCallsAsJson,
getFunctionCallsFromPartsAsJson,
getStructuredResponse,
getStructuredResponseFromParts,
} from './generateContentResponseUtilities.js';
import {
GenerateContentResponse,
Part,
FinishReason,
SafetyRating,
} from '@google/genai';
const mockTextPart = (text: string): Part => ({ text });
const mockFunctionCallPart = (
name: string,
args?: Record<string, unknown>,
): Part => ({
functionCall: { name, args: args ?? {} },
});
const mockResponse = (
parts: Part[],
finishReason: FinishReason = FinishReason.STOP,
safetyRatings: SafetyRating[] = [],
): GenerateContentResponse => ({
candidates: [
{
content: {
parts,
role: 'model',
},
index: 0,
finishReason,
safetyRatings,
},
],
promptFeedback: {
safetyRatings: [],
},
text: undefined,
data: undefined,
functionCalls: undefined,
executableCode: undefined,
codeExecutionResult: undefined,
});
const minimalMockResponse = (
candidates: GenerateContentResponse['candidates'],
): GenerateContentResponse => ({
candidates,
promptFeedback: { safetyRatings: [] },
text: undefined,
data: undefined,
functionCalls: undefined,
executableCode: undefined,
codeExecutionResult: undefined,
});
describe('generateContentResponseUtilities', () => {
describe('getResponseText', () => {
it('should return undefined for no candidates', () => {
expect(getResponseText(minimalMockResponse(undefined))).toBeUndefined();
});
it('should return undefined for empty candidates array', () => {
expect(getResponseText(minimalMockResponse([]))).toBeUndefined();
});
it('should return undefined for no parts', () => {
const response = mockResponse([]);
expect(getResponseText(response)).toBeUndefined();
});
it('should extract text from a single text part', () => {
const response = mockResponse([mockTextPart('Hello')]);
expect(getResponseText(response)).toBe('Hello');
});
it('should concatenate text from multiple text parts', () => {
const response = mockResponse([
mockTextPart('Hello '),
mockTextPart('World'),
]);
expect(getResponseText(response)).toBe('Hello World');
});
it('should ignore function call parts', () => {
const response = mockResponse([
mockTextPart('Hello '),
mockFunctionCallPart('testFunc'),
mockTextPart('World'),
]);
expect(getResponseText(response)).toBe('Hello World');
});
it('should return undefined if only function call parts exist', () => {
const response = mockResponse([
mockFunctionCallPart('testFunc'),
mockFunctionCallPart('anotherFunc'),
]);
expect(getResponseText(response)).toBeUndefined();
});
});
describe('getResponseTextFromParts', () => {
it('should return undefined for no parts', () => {
expect(getResponseTextFromParts([])).toBeUndefined();
});
it('should extract text from a single text part', () => {
expect(getResponseTextFromParts([mockTextPart('Hello')])).toBe('Hello');
});
it('should concatenate text from multiple text parts', () => {
expect(
getResponseTextFromParts([
mockTextPart('Hello '),
mockTextPart('World'),
]),
).toBe('Hello World');
});
it('should ignore function call parts', () => {
expect(
getResponseTextFromParts([
mockTextPart('Hello '),
mockFunctionCallPart('testFunc'),
mockTextPart('World'),
]),
).toBe('Hello World');
});
it('should return undefined if only function call parts exist', () => {
expect(
getResponseTextFromParts([
mockFunctionCallPart('testFunc'),
mockFunctionCallPart('anotherFunc'),
]),
).toBeUndefined();
});
});
describe('getFunctionCalls', () => {
it('should return undefined for no candidates', () => {
expect(getFunctionCalls(minimalMockResponse(undefined))).toBeUndefined();
});
it('should return undefined for empty candidates array', () => {
expect(getFunctionCalls(minimalMockResponse([]))).toBeUndefined();
});
it('should return undefined for no parts', () => {
const response = mockResponse([]);
expect(getFunctionCalls(response)).toBeUndefined();
});
it('should extract a single function call', () => {
const func = { name: 'testFunc', args: { a: 1 } };
const response = mockResponse([
mockFunctionCallPart(func.name, func.args),
]);
expect(getFunctionCalls(response)).toEqual([func]);
});
it('should extract multiple function calls', () => {
const func1 = { name: 'testFunc1', args: { a: 1 } };
const func2 = { name: 'testFunc2', args: { b: 2 } };
const response = mockResponse([
mockFunctionCallPart(func1.name, func1.args),
mockFunctionCallPart(func2.name, func2.args),
]);
expect(getFunctionCalls(response)).toEqual([func1, func2]);
});
it('should ignore text parts', () => {
const func = { name: 'testFunc', args: { a: 1 } };
const response = mockResponse([
mockTextPart('Some text'),
mockFunctionCallPart(func.name, func.args),
mockTextPart('More text'),
]);
expect(getFunctionCalls(response)).toEqual([func]);
});
it('should return undefined if only text parts exist', () => {
const response = mockResponse([
mockTextPart('Some text'),
mockTextPart('More text'),
]);
expect(getFunctionCalls(response)).toBeUndefined();
});
});
describe('getFunctionCallsFromParts', () => {
it('should return undefined for no parts', () => {
expect(getFunctionCallsFromParts([])).toBeUndefined();
});
it('should extract a single function call', () => {
const func = { name: 'testFunc', args: { a: 1 } };
expect(
getFunctionCallsFromParts([mockFunctionCallPart(func.name, func.args)]),
).toEqual([func]);
});
it('should extract multiple function calls', () => {
const func1 = { name: 'testFunc1', args: { a: 1 } };
const func2 = { name: 'testFunc2', args: { b: 2 } };
expect(
getFunctionCallsFromParts([
mockFunctionCallPart(func1.name, func1.args),
mockFunctionCallPart(func2.name, func2.args),
]),
).toEqual([func1, func2]);
});
it('should ignore text parts', () => {
const func = { name: 'testFunc', args: { a: 1 } };
expect(
getFunctionCallsFromParts([
mockTextPart('Some text'),
mockFunctionCallPart(func.name, func.args),
mockTextPart('More text'),
]),
).toEqual([func]);
});
it('should return undefined if only text parts exist', () => {
expect(
getFunctionCallsFromParts([
mockTextPart('Some text'),
mockTextPart('More text'),
]),
).toBeUndefined();
});
});
describe('getFunctionCallsAsJson', () => {
it('should return JSON string of function calls', () => {
const func1 = { name: 'testFunc1', args: { a: 1 } };
const func2 = { name: 'testFunc2', args: { b: 2 } };
const response = mockResponse([
mockFunctionCallPart(func1.name, func1.args),
mockTextPart('text in between'),
mockFunctionCallPart(func2.name, func2.args),
]);
const expectedJson = JSON.stringify([func1, func2], null, 2);
expect(getFunctionCallsAsJson(response)).toBe(expectedJson);
});
it('should return undefined if no function calls', () => {
const response = mockResponse([mockTextPart('Hello')]);
expect(getFunctionCallsAsJson(response)).toBeUndefined();
});
});
describe('getFunctionCallsFromPartsAsJson', () => {
it('should return JSON string of function calls from parts', () => {
const func1 = { name: 'testFunc1', args: { a: 1 } };
const func2 = { name: 'testFunc2', args: { b: 2 } };
const parts = [
mockFunctionCallPart(func1.name, func1.args),
mockTextPart('text in between'),
mockFunctionCallPart(func2.name, func2.args),
];
const expectedJson = JSON.stringify([func1, func2], null, 2);
expect(getFunctionCallsFromPartsAsJson(parts)).toBe(expectedJson);
});
it('should return undefined if no function calls in parts', () => {
const parts = [mockTextPart('Hello')];
expect(getFunctionCallsFromPartsAsJson(parts)).toBeUndefined();
});
});
describe('getStructuredResponse', () => {
it('should return only text if only text exists', () => {
const response = mockResponse([mockTextPart('Hello World')]);
expect(getStructuredResponse(response)).toBe('Hello World');
});
it('should return only function call JSON if only function calls exist', () => {
const func = { name: 'testFunc', args: { data: 'payload' } };
const response = mockResponse([
mockFunctionCallPart(func.name, func.args),
]);
const expectedJson = JSON.stringify([func], null, 2);
expect(getStructuredResponse(response)).toBe(expectedJson);
});
it('should return text and function call JSON if both exist', () => {
const text = 'Consider this data:';
const func = { name: 'processData', args: { item: 42 } };
const response = mockResponse([
mockTextPart(text),
mockFunctionCallPart(func.name, func.args),
]);
const expectedJson = JSON.stringify([func], null, 2);
expect(getStructuredResponse(response)).toBe(`${text}\n${expectedJson}`);
});
it('should return undefined if neither text nor function calls exist', () => {
const response = mockResponse([]);
expect(getStructuredResponse(response)).toBeUndefined();
});
});
describe('getStructuredResponseFromParts', () => {
it('should return only text if only text exists in parts', () => {
const parts = [mockTextPart('Hello World')];
expect(getStructuredResponseFromParts(parts)).toBe('Hello World');
});
it('should return only function call JSON if only function calls exist in parts', () => {
const func = { name: 'testFunc', args: { data: 'payload' } };
const parts = [mockFunctionCallPart(func.name, func.args)];
const expectedJson = JSON.stringify([func], null, 2);
expect(getStructuredResponseFromParts(parts)).toBe(expectedJson);
});
it('should return text and function call JSON if both exist in parts', () => {
const text = 'Consider this data:';
const func = { name: 'processData', args: { item: 42 } };
const parts = [
mockTextPart(text),
mockFunctionCallPart(func.name, func.args),
];
const expectedJson = JSON.stringify([func], null, 2);
expect(getStructuredResponseFromParts(parts)).toBe(
`${text}\n${expectedJson}`,
);
});
it('should return undefined if neither text nor function calls exist in parts', () => {
const parts: Part[] = [];
expect(getStructuredResponseFromParts(parts)).toBeUndefined();
});
});
});
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