js_interop_gen/test/sdk_version_test.dart

// Copyright (c) 2026, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

@TestOn('vm')
library;

import 'dart:io';
import 'dart:isolate';

import 'package:js_interop_gen/src/sdk_version.dart';
import 'package:path/path.dart' as p;
import 'package:pub_semver/pub_semver.dart';
import 'package:test/test.dart';
import 'package:yaml/yaml.dart';

void main() {
  test('sdkVersion aligns with pubspec.yaml', () async {
    final uri = await Isolate.resolvePackageUri(
      Uri.parse('package:js_interop_gen/src/sdk_version.dart'),
    );
    expect(uri, isNotNull);
    final packageRoot = p.dirname(p.dirname(p.dirname(p.fromUri(uri!))));
    final pubspecFile = File(p.join(packageRoot, 'pubspec.yaml'));

    expect(
      pubspecFile.existsSync(),
      isTrue,
      reason: 'pubspec.yaml not found at ${pubspecFile.path}',
    );

    final pubspecContent = pubspecFile.readAsStringSync();
    final sdkConstraintStr = switch (loadYaml(pubspecContent)) {
      {'environment': {'sdk': final String s}} => s,
      _ => throw const FormatException(
        'No sdk constraint found in pubspec.yaml',
      ),
    };

    final sdkConstraint = VersionConstraint.parse(sdkConstraintStr);
    final expectedVersion = deriveLanguageVersion(sdkConstraint);

    expect(
      dartLanguageVersion,
      equals(expectedVersion),
      reason:
          'dartLanguageVersion $dartLanguageVersion does not match expected '
          'version $expectedVersion derived from minimum of constraint '
          '$sdkConstraint',
    );
  });

  test('language version derived from SDK constraint', () {
    void check(String constraintStr, Version expected) {
      final constraint = VersionConstraint.parse(constraintStr);
      final languageVersion = deriveLanguageVersion(constraint);
      expect(languageVersion, equals(expected));
    }

    check('^3.12.2-0', Version(3, 12, 0));
    check('^3.10.0', Version(3, 10, 0));
    check('3.12.0', Version(3, 12, 0));
    check('<4.0.0', Version(0, 0, 0));
  });
}