test/hello: DRY up JSON content-type in tests

Author: kevmoo

test/hello/test/cloud_event_test.dart

@@ -100,7 +100,7 @@ void main() {
       final stderrOutput = await _makeBadRequest(
         _pubSubJsonString,
         {
-          'Content-Type': 'application/json; charset=utf-8',
+          ...jsonContentType,
           'ce-specversion': '1.0',
           'ce-type': 'google.cloud.pubsub.topic.publish',
           'ce-time': 'bad time!',
@@ -136,7 +136,7 @@ void main() {
  }
 }''',
         {
-          'Content-Type': 'application/json; charset=utf-8',
+          ...jsonContentType,
           'ce-specversion': '1.0',
           'ce-type': 'google.cloud.pubsub.topic.publish',
           'ce-time': 'bad time!',
@@ -183,9 +183,7 @@ void main() {
     }
   }
 }''';
-      final response = await _makeRequest(body, {
-        'Content-Type': 'application/json; charset=utf-8',
-      });
+      final response = await _makeRequest(body, jsonContentType);
       expect(response.statusCode, 200);
       expect(response.body, isEmpty);
       expect(

test/hello/test/custom_type_test.dart

@@ -78,9 +78,7 @@ void main() {
       final requestUrl = 'http://localhost:$autoPort/';
       final response = await post(
         requestUrl,
-        headers: {
-          'Content-Type': 'application/json; charset=utf-8',
-        },
+        headers: jsonContentType,
         body: 'not json!',
       );
 
@@ -94,9 +92,7 @@ void main() {
       final requestUrl = 'http://localhost:$autoPort/';
       final response = await post(
         requestUrl,
-        headers: {
-          'Content-Type': 'application/json; charset=utf-8',
-        },
+        headers: jsonContentType,
         body: '[]',
       );
 
@@ -123,9 +119,7 @@ void main() {
         final requestUrl = 'http://localhost:$autoPort/';
         final response = await post(
           requestUrl,
-          headers: {
-            'Content-Type': 'application/json; charset=utf-8',
-          },
+          headers: jsonContentType,
           body: jsonEncode(
             PubSub(
               PubSubMessage(
@@ -168,9 +162,7 @@ void main() {
         final requestUrl = 'http://localhost:$autoPort/';
         final response = await post(
           requestUrl,
-          headers: {
-            'Content-Type': 'application/json; charset=utf-8',
-          },
+          headers: jsonContentType,
           body: '{"a":1}',
         );
 
@@ -197,9 +189,7 @@ void main() {
         final requestUrl = 'http://localhost:$autoPort/';
         final response = await post(
           requestUrl,
-          headers: {
-            'Content-Type': 'application/json; charset=utf-8',
-          },
+          headers: jsonContentType,
           body: '{"a":1}',
         );
         expect(response.statusCode, 200);
@@ -227,9 +217,7 @@ void main() {
         final requestUrl = 'http://localhost:$autoPort/';
         final response = await post(
           requestUrl,
-          headers: {
-            'Content-Type': 'application/json; charset=utf-8',
-          },
+          headers: jsonContentType,
           body: '{}',
         );
         expect(response.statusCode, 200);

test/hello/test/src/test_utils.dart

@@ -18,6 +18,10 @@ import 'package:http/http.dart' as http;
 import 'package:test/test.dart';
 import 'package:test_process/test_process.dart';
 
+const jsonContentType = {
+  'Content-Type': 'application/json; charset=utf-8',
+};
+
 Future<http.Response> get(Object url, {Map<String, String>? headers}) =>
     http.get(url is String ? Uri.parse(url) : url as Uri, headers: headers);