Add tests for nested packages case

test/integration/helpers.dart

@@ -0,0 +1,23 @@
+import 'package:test_descriptor/test_descriptor.dart' as d;
+
+d.FileDescriptor getPubspecYamlFile(String packageName) => d.file(
+      'pubspec.yaml',
+      '''
+name: $packageName
+version: 1.2.3
+environment:
+  sdk: '>=2.12.0 <3.0.0'
+
+dev_dependencies:
+  build_runner: ^2.0.0
+  build_version: ^2.0.0
+''',
+    );
+
+d.FileDescriptor getGeneratedVersionFile(String version) => d.file(
+      'version.dart',
+      '''
+// Generated code. Do not modify.
+const packageVersion = '$version';
+''',
+    );

test/integration/nested_integration_test.dart

@@ -0,0 +1,99 @@
+@Timeout.factor(4)
+
+import 'package:build_verify/build_verify.dart' show defaultCommand;
+import 'package:build_verify/src/impl.dart';
+import 'package:build_verify/src/utils.dart';
+import 'package:git/git.dart';
+import 'package:test/test.dart';
+import 'package:test_descriptor/test_descriptor.dart' as d;
+import 'package:test_process/test_process.dart';
+
+import 'helpers.dart';
+
+void main() {
+  setUp(() async {
+    await d.dir('package_a', [
+      getPubspecYamlFile('package_a'),
+      d.dir('lib', [
+        d.dir('src', [
+          getGeneratedVersionFile('1.2.3'),
+        ])
+      ])
+    ]).create();
+
+    await d.dir('package_b', [
+      getPubspecYamlFile('package_b'),
+      d.dir('lib', [
+        d.dir('src', [
+          getGeneratedVersionFile('1.2.3'),
+        ])
+      ])
+    ]).create();
+
+    final gitDir = await GitDir.init(d.sandbox, allowContent: true);
+    await gitDir.runCommand(['add', '.']);
+    await gitDir.runCommand(['commit', '-am', 'test']);
+
+    final packageAProcess = await TestProcess.start(
+      dartPath,
+      ['pub', 'get'],
+      workingDirectory: '${d.sandbox}/package_a',
+    );
+
+    await packageAProcess.shouldExit(0);
+
+    final packageBProcess = await TestProcess.start(
+      dartPath,
+      ['pub', 'get'],
+      workingDirectory: '${d.sandbox}/package_b',
+    );
+
+    await packageBProcess.shouldExit(0);
+  });
+
+  test(
+    'when they have no modification, package a and b tests should pass',
+    () async {
+      await expectBuildCleanImpl(
+        '${d.sandbox}/package_a',
+        defaultCommand,
+        packageRelativeDirectory: 'package_a',
+      );
+      await expectBuildCleanImpl(
+        '${d.sandbox}/package_b',
+        defaultCommand,
+        packageRelativeDirectory: 'package_b',
+      );
+    },
+  );
+
+  test(
+    '''when package b has modifications,
+      package a test should pass and package b test should fail''',
+    () async {
+      await d.dir('package_b', [
+        getPubspecYamlFile('package_b'),
+        d.dir('lib', [
+          d.dir('src', [
+            getGeneratedVersionFile('1.2.4'),
+          ])
+        ])
+      ]).create();
+
+      await expectBuildCleanImpl(
+        '${d.sandbox}/package_a',
+        defaultCommand,
+        packageRelativeDirectory: 'package_a',
+      );
+
+      expect(
+        () => expectBuildCleanImpl(
+          '${d.sandbox}/package_b',
+          defaultCommand,
+          packageRelativeDirectory: 'package_b',
+        ),
+        throwsA(const TypeMatcher<TestFailure>()),
+      );
+    },
+  );
+}

test/integration_test.dart → test/integration/simple_integration_test.dart

@@ -8,31 +8,15 @@ import 'package:test/test.dart';
 import 'package:test_descriptor/test_descriptor.dart' as d;
 import 'package:test_process/test_process.dart';
 
+import 'helpers.dart';
+
 void main() {
   setUp(() async {
-    await d.file(
-      'pubspec.yaml',
-      '''
-name: example
-version: 1.2.3
-environment:
-  sdk: '>=2.12.0 <3.0.0'
-
-dev_dependencies:
-  build_runner: ^2.0.0
-  build_version: ^2.0.0
-''',
-    ).create();
+    await getPubspecYamlFile('example').create();
 
     await d.dir('lib', [
       d.dir('src', [
-        d.file(
-          'version.dart',
-          r'''
-// Generated code. Do not modify.
-const packageVersion = '1.2.3';
-''',
-        )
+        getGeneratedVersionFile('1.2.3'),
       ])
     ]).create();