script/tool/test/common/git_version_finder_test.dart

// Copyright 2013 The Flutter Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:io';

import 'package:flutter_plugin_tools/src/common/git_version_finder.dart';
import 'package:mockito/mockito.dart';
import 'package:test/test.dart';

import 'package_command_test.mocks.dart';

void main() {
  late List<List<String>?> gitDirCommands;
  late String gitDiffResponse;
  late MockGitDir gitDir;
  String mergeBaseResponse = '';

  setUp(() {
    gitDirCommands = <List<String>?>[];
    gitDiffResponse = '';
    gitDir = MockGitDir();
    when(gitDir.runCommand(any, throwOnError: anyNamed('throwOnError')))
        .thenAnswer((Invocation invocation) {
      final List<String> arguments =
          invocation.positionalArguments[0]! as List<String>;
      gitDirCommands.add(arguments);
      String? gitStdOut;
      if (arguments[0] == 'diff') {
        gitStdOut = gitDiffResponse;
      } else if (arguments[0] == 'merge-base') {
        gitStdOut = mergeBaseResponse;
      }
      return Future<ProcessResult>.value(
          ProcessResult(0, 0, gitStdOut ?? '', ''));
    });
  });

  test('No git diff should result no files changed', () async {
    final GitVersionFinder finder =
        GitVersionFinder(gitDir, baseSha: 'some base sha');
    final List<String> changedFiles = await finder.getChangedFiles();

    expect(changedFiles, isEmpty);
  });

  test('get correct files changed based on git diff', () async {
    gitDiffResponse = '''
file1/file1.cc
file2/file2.cc
''';
    final GitVersionFinder finder =
        GitVersionFinder(gitDir, baseSha: 'some base sha');
    final List<String> changedFiles = await finder.getChangedFiles();

    expect(changedFiles, equals(<String>['file1/file1.cc', 'file2/file2.cc']));
  });

  test('use correct base sha if not specified', () async {
    mergeBaseResponse = 'shaqwiueroaaidf12312jnadf123nd';
    gitDiffResponse = '''
file1/pubspec.yaml
file2/file2.cc
''';

    final GitVersionFinder finder = GitVersionFinder(gitDir);
    await finder.getChangedFiles();
    verify(gitDir.runCommand(
        <String>['merge-base', '--fork-point', 'FETCH_HEAD', 'HEAD'],
        throwOnError: false));
    verify(gitDir.runCommand(
        <String>['diff', '--name-only', mergeBaseResponse, 'HEAD']));
  });

  test('uses correct base branch to find base sha if specified', () async {
    mergeBaseResponse = 'shaqwiueroaaidf12312jnadf123nd';
    gitDiffResponse = '''
file1/pubspec.yaml
file2/file2.cc
''';

    final GitVersionFinder finder =
        GitVersionFinder(gitDir, baseBranch: 'upstream/main');
    await finder.getChangedFiles();
    verify(gitDir.runCommand(
        <String>['merge-base', '--fork-point', 'upstream/main', 'HEAD'],
        throwOnError: false));
    verify(gitDir.runCommand(
        <String>['diff', '--name-only', mergeBaseResponse, 'HEAD']));
  });

  test('use correct base sha if specified', () async {
    const String customBaseSha = 'aklsjdcaskf12312';
    gitDiffResponse = '''
file1/pubspec.yaml
file2/file2.cc
''';
    final GitVersionFinder finder =
        GitVersionFinder(gitDir, baseSha: customBaseSha);
    await finder.getChangedFiles();
    verify(gitDir
        .runCommand(<String>['diff', '--name-only', customBaseSha, 'HEAD']));
  });

  test('include uncommitted files if requested', () async {
    const String customBaseSha = 'aklsjdcaskf12312';
    gitDiffResponse = '''
file1/pubspec.yaml
file2/file2.cc
''';
    final GitVersionFinder finder =
        GitVersionFinder(gitDir, baseSha: customBaseSha);
    await finder.getChangedFiles(includeUncommitted: true);
    // The call should not have HEAD as a final argument like the default diff.
    verify(gitDir.runCommand(<String>['diff', '--name-only', customBaseSha]));
  });
}