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chore(firebaseai): add token count tests for different scenarios #17521

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59564ae
feat: add token count tests for different scenarios
google-labs-jules[bot] Jul 15, 2025
cb9cc80
fix the dataPart signature
cynthiajoan Jul 15, 2025
66bbfc7
minor tweak
cynthiajoan Jul 15, 2025
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152 changes: 142 additions & 10 deletions packages/firebase_ai/firebase_ai/example/lib/pages/token_count_page.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,9 @@
// See the License for the specific language governing permissions and
// limitations under the License.

import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:firebase_ai/firebase_ai.dart';
import '../widgets/message_widget.dart';

Expand Down Expand Up @@ -58,17 +60,27 @@ class _TokenCountPageState extends State<TokenCountPage> {
vertical: 25,
horizontal: 15,
),
child: Row(
child: Column(
children: [
Expanded(
child: ElevatedButton(
onPressed: !_loading
? () async {
await _testCountToken();
}
: null,
child: const Text('Count Tokens'),
),
ElevatedButton(
onPressed: !_loading ? _testCountToken : null,
child: const Text('Count text tokens'),
),
ElevatedButton(
onPressed: !_loading ? _testCountTokenChat : null,
child: const Text('Count chat tokens'),
),
ElevatedButton(
onPressed: !_loading ? _testCountTokenImage : null,
child: const Text('Count image tokens'),
),
ElevatedButton(
onPressed: !_loading ? _testCountTokenVideo : null,
child: const Text('Count video tokens'),
),
ElevatedButton(
onPressed: !_loading ? _testCountTokenPdf : null,
child: const Text('Count PDF tokens'),
),
],
),
Expand Down Expand Up @@ -102,4 +114,124 @@ class _TokenCountPageState extends State<TokenCountPage> {
_loading = false;
});
}

Future<void> _testCountTokenPdf() async {
setState(() {
_loading = true;
});

final pdfBytes =
(await rootBundle.load('assets/documents/gemini_summary.pdf'))
.buffer
.asUint8List();
const text = 'what is in the document?';
final content = Content.multi(
[InlineDataPart('application/pdf', pdfBytes), TextPart(text)]);

final tokenResponse = await widget.model.countTokens([content]);
final tokenResult = 'Count token from video: ${tokenResponse.totalTokens}';
_messages.add(MessageData(text: tokenResult, fromUser: false));

final contentResponse = await widget.model.generateContent([content]);
final contentMetaData = 'result metadata, promptTokenCount:'
'${contentResponse.usageMetadata!.promptTokenCount}, '
'candidatesTokenCount:'
'${contentResponse.usageMetadata!.candidatesTokenCount}, '
'totalTokenCount:'
'${contentResponse.usageMetadata!.totalTokenCount}';
_messages.add(MessageData(text: contentMetaData, fromUser: false));

setState(() {
_loading = false;
});
}

Future<void> _testCountTokenVideo() async {
setState(() {
_loading = true;
});

final busyCatBytes = (await rootBundle.load('assets/videos/landscape.mp4'))
.buffer
.asUint8List();
const text = 'what is in the video?';
final content = Content.multi(
[InlineDataPart('video/mp4', busyCatBytes), TextPart(text)]);

final tokenResponse = await widget.model.countTokens([content]);
final tokenResult = 'Count token from video: ${tokenResponse.totalTokens}';
_messages.add(MessageData(text: tokenResult, fromUser: false));

final contentResponse = await widget.model.generateContent([content]);
final contentMetaData = 'result metadata, promptTokenCount:'
'${contentResponse.usageMetadata!.promptTokenCount}, '
'candidatesTokenCount:'
'${contentResponse.usageMetadata!.candidatesTokenCount}, '
'totalTokenCount:'
'${contentResponse.usageMetadata!.totalTokenCount}';
_messages.add(MessageData(text: contentMetaData, fromUser: false));

setState(() {
_loading = false;
});
}

Future<void> _testCountTokenImage() async {
setState(() {
_loading = true;
});

final catBytes =
(await rootBundle.load('assets/images/cat.jpg')).buffer.asUint8List();
const text = 'what is in the image?';
final content =
Content.multi([InlineDataPart('image/jpeg', catBytes), TextPart(text)]);

final tokenResponse = await widget.model.countTokens([content]);
final tokenResult = 'Count token from image: ${tokenResponse.totalTokens}';
_messages.add(MessageData(text: tokenResult, fromUser: false));

final contentResponse = await widget.model.generateContent([content]);
final contentMetaData = 'result metadata, promptTokenCount:'
'${contentResponse.usageMetadata!.promptTokenCount}, '
'candidatesTokenCount:'
'${contentResponse.usageMetadata!.candidatesTokenCount}, '
'totalTokenCount:'
'${contentResponse.usageMetadata!.totalTokenCount}';
_messages.add(MessageData(text: contentMetaData, fromUser: false));

setState(() {
_loading = false;
});
}

Future<void> _testCountTokenChat() async {
setState(() {
_loading = true;
});

final chat = widget.model.startChat(history: [
Content.text('hello'),
Content.model([TextPart('great to meet you, how can I help?')]),
]);
final tokenResponse = await widget.model.countTokens(chat.history);
final tokenResult = 'Count token from chat history: '
'${tokenResponse.totalTokens}';
_messages.add(MessageData(text: tokenResult, fromUser: false));

const prompt = 'tell a short story';
final content = Content.text(prompt);
final contentResponse = await chat.sendMessage(content);
final contentMetaData = 'result metadata, promptTokenCount:'
'${contentResponse.usageMetadata!.promptTokenCount}, '
'candidatesTokenCount:'
'${contentResponse.usageMetadata!.candidatesTokenCount}, '
'totalTokenCount:'
'${contentResponse.usageMetadata!.totalTokenCount}';
_messages.add(MessageData(text: contentMetaData, fromUser: false));

setState(() {
_loading = false;
});
}
}
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