Don't require json_annotation in dependencies if it's just used in tests

Fixes google#1014

Prepare to release v6.0.1

Author: kevmoo

json_serializable/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 6.0.1
+
+- Don't require `json_annotation` in `dependencies` if it's just used in tests.
+
 ## 6.0.0
 
 - Added support for `JsonSerializable.constructor` to allow specifying an 

json_serializable/lib/src/json_part_builder.dart

@@ -52,13 +52,13 @@ class _UnifiedGenerator extends Generator {
 
   @override
   Future<String?> generate(LibraryReader library, BuildStep buildStep) async {
-    await pubspecHasRightVersion(buildStep);
-
     final values = <String>{};
 
     for (var generator in _generators) {
       for (var annotatedElement
           in library.annotatedWith(generator.typeChecker)) {
+        await pubspecHasRightVersion(buildStep);
+
         final generatedValue = generator.generateForAnnotatedElement(
             annotatedElement.element, annotatedElement.annotation, buildStep);
         for (var value in _normalizeGeneratorOutput(generatedValue)) {

json_serializable/pubspec.yaml

@@ -1,5 +1,5 @@
 name: json_serializable
-version: 6.0.0
+version: 6.0.1
 description: >-
   Automatically generate code for converting to and from JSON by annotating
   Dart classes.

json_serializable/test/annotation_version_test.dart

@@ -132,6 +132,16 @@ Future<void> _structurePackage({
 
   await d.file('pubspec.yaml', pubspec).create();
 
+  /// A file in the lib directory without JsonSerializable should do nothing!
+  await d.dir(
+    'lib',
+    [
+      d.file('no_op.dart', '''
+class NoOp {}
+''')
+    ],
+  ).create();
+
   await d.dir(
     sourceDirectory,
     [
@@ -155,18 +165,17 @@ class SomeClass{}
     workingDirectory: d.sandbox,
   );
 
-  await proc.stdoutStream().forEach(print);
+  final lines = StringBuffer();
+  await for (var line in proc.stdoutStream()) {
+    lines.writeln(line);
+    print(line);
+  }
 
-  await expectLater(
-    proc.stdout,
-    emitsThrough(
-      emitsInOrder([
-        '[SEVERE] json_serializable:json_serializable on $sourceDirectory/sample.dart:',
-        '',
-        message,
-      ]),
-    ),
-  );
+  expect(lines.toString(), contains('''
+[SEVERE] json_serializable:json_serializable on $sourceDirectory/sample.dart:
+
+$message
+'''));
 
   await proc.shouldExit(1);
 }