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| 1 | +/** |
| 2 | + * @license |
| 3 | + * Copyright 2025 Google LLC |
| 4 | + * |
| 5 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | + * you may not use this file except in compliance with the License. |
| 7 | + * You may obtain a copy of the License at |
| 8 | + * |
| 9 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | + * |
| 11 | + * Unless required by applicable law or agreed to in writing, software |
| 12 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | + * See the License for the specific language governing permissions and |
| 15 | + * limitations under the License. |
| 16 | + */ |
| 17 | + |
| 18 | +import { expect } from 'chai'; |
| 19 | +import { |
| 20 | + Content, |
| 21 | + GenerationConfig, |
| 22 | + HarmBlockThreshold, |
| 23 | + HarmCategory, |
| 24 | + SafetySetting, |
| 25 | + getGenerativeModel |
| 26 | +} from '../src'; |
| 27 | +import { testConfigs, TOKEN_COUNT_DELTA } from './constants'; |
| 28 | + |
| 29 | +describe('Chat Session', () => { |
| 30 | + testConfigs.forEach(testConfig => { |
| 31 | + describe(`${testConfig.toString()}`, () => { |
| 32 | + const commonGenerationConfig: GenerationConfig = { |
| 33 | + temperature: 0, |
| 34 | + topP: 0, |
| 35 | + responseMimeType: 'text/plain' |
| 36 | + }; |
| 37 | + |
| 38 | + const commonSafetySettings: SafetySetting[] = [ |
| 39 | + { |
| 40 | + category: HarmCategory.HARM_CATEGORY_HARASSMENT, |
| 41 | + threshold: HarmBlockThreshold.BLOCK_LOW_AND_ABOVE |
| 42 | + }, |
| 43 | + { |
| 44 | + category: HarmCategory.HARM_CATEGORY_HATE_SPEECH, |
| 45 | + threshold: HarmBlockThreshold.BLOCK_LOW_AND_ABOVE |
| 46 | + }, |
| 47 | + { |
| 48 | + category: HarmCategory.HARM_CATEGORY_SEXUALLY_EXPLICIT, |
| 49 | + threshold: HarmBlockThreshold.BLOCK_LOW_AND_ABOVE |
| 50 | + }, |
| 51 | + { |
| 52 | + category: HarmCategory.HARM_CATEGORY_DANGEROUS_CONTENT, |
| 53 | + threshold: HarmBlockThreshold.BLOCK_LOW_AND_ABOVE |
| 54 | + } |
| 55 | + ]; |
| 56 | + |
| 57 | + const commonSystemInstruction: Content = { |
| 58 | + role: 'system', |
| 59 | + parts: [ |
| 60 | + { |
| 61 | + text: 'You are a friendly and helpful assistant.' |
| 62 | + } |
| 63 | + ] |
| 64 | + }; |
| 65 | + |
| 66 | + it('startChat and sendMessage: text input, text output', async () => { |
| 67 | + const model = getGenerativeModel(testConfig.ai, { |
| 68 | + model: testConfig.model, |
| 69 | + generationConfig: commonGenerationConfig, |
| 70 | + safetySettings: commonSafetySettings, |
| 71 | + systemInstruction: commonSystemInstruction |
| 72 | + }); |
| 73 | + |
| 74 | + const chat = model.startChat(); |
| 75 | + const result1 = await chat.sendMessage( |
| 76 | + 'What is the capital of France?' |
| 77 | + ); |
| 78 | + const response1 = result1.response; |
| 79 | + expect(response1.text().trim().toLowerCase()).to.include('paris'); |
| 80 | + |
| 81 | + let history = await chat.getHistory(); |
| 82 | + expect(history.length).to.equal(2); |
| 83 | + expect(history[0].role).to.equal('user'); |
| 84 | + expect(history[0].parts[0].text).to.equal( |
| 85 | + 'What is the capital of France?' |
| 86 | + ); |
| 87 | + expect(history[1].role).to.equal('model'); |
| 88 | + expect(history[1].parts[0].text?.toLowerCase()).to.include('paris'); |
| 89 | + |
| 90 | + expect(response1.usageMetadata).to.not.be.null; |
| 91 | + // Token counts can vary slightly in chat context |
| 92 | + expect(response1.usageMetadata!.promptTokenCount).to.be.closeTo( |
| 93 | + 15, // "What is the capital of France?" + system instruction |
| 94 | + TOKEN_COUNT_DELTA + 2 // More variance for chat context |
| 95 | + ); |
| 96 | + expect(response1.usageMetadata!.candidatesTokenCount).to.be.closeTo( |
| 97 | + 8, // "Paris" |
| 98 | + TOKEN_COUNT_DELTA |
| 99 | + ); |
| 100 | + expect(response1.usageMetadata!.totalTokenCount).to.be.closeTo( |
| 101 | + 23, // "What is the capital of France?" + system instruction + "Paris" |
| 102 | + TOKEN_COUNT_DELTA + 3 // More variance for chat context |
| 103 | + ); |
| 104 | + |
| 105 | + const result2 = await chat.sendMessage('And what about Italy?'); |
| 106 | + const response2 = result2.response; |
| 107 | + expect(response2.text().trim().toLowerCase()).to.include('rome'); |
| 108 | + |
| 109 | + history = await chat.getHistory(); |
| 110 | + expect(history.length).to.equal(4); |
| 111 | + expect(history[2].role).to.equal('user'); |
| 112 | + expect(history[2].parts[0].text).to.equal('And what about Italy?'); |
| 113 | + expect(history[3].role).to.equal('model'); |
| 114 | + expect(history[3].parts[0].text?.toLowerCase()).to.include('rome'); |
| 115 | + |
| 116 | + expect(response2.usageMetadata).to.not.be.null; |
| 117 | + expect(response2.usageMetadata!.promptTokenCount).to.be.closeTo( |
| 118 | + 28, // History + "And what about Italy?" + system instruction |
| 119 | + TOKEN_COUNT_DELTA + 5 // More variance for chat context with history |
| 120 | + ); |
| 121 | + expect(response2.usageMetadata!.candidatesTokenCount).to.be.closeTo( |
| 122 | + 8, |
| 123 | + TOKEN_COUNT_DELTA |
| 124 | + ); |
| 125 | + expect(response2.usageMetadata!.totalTokenCount).to.be.closeTo( |
| 126 | + 36, |
| 127 | + TOKEN_COUNT_DELTA |
| 128 | + ); |
| 129 | + }); |
| 130 | + }); |
| 131 | + }); |
| 132 | +}); |
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