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basic_message_channel_unittests.cc
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "flutter/shell/platform/common/client_wrapper/include/flutter/basic_message_channel.h"
6
7 #include <memory>
8 #include <string>
9
10 #include "flutter/shell/platform/common/client_wrapper/include/flutter/binary_messenger.h"
11 #include "flutter/shell/platform/common/client_wrapper/include/flutter/standard_message_codec.h"
12 #include "flutter/shell/platform/common/client_wrapper/include/flutter/standard_method_codec.h"
13 #include "gtest/gtest.h"
14
15 namespace flutter {
16
17 namespace {
18
19 class TestBinaryMessenger : public BinaryMessenger {
20 public:
21 void Send(const std::string& channel,
22 const uint8_t* message,
23 const size_t message_size,
24 BinaryReply reply) const override {
25 send_called_ = true;
26 int length = static_cast<int>(message_size);
27 last_message_ =
28 std::vector<uint8_t>(message, message + length * sizeof(uint8_t));
29 }
30
31 void SetMessageHandler(const std::string& channel,
32 BinaryMessageHandler handler) override {
33 last_message_handler_channel_ = channel;
34 last_message_handler_ = handler;
35 }
36
37 bool send_called() { return send_called_; }
38
39 std::string last_message_handler_channel() {
40 return last_message_handler_channel_;
41 }
42
43 BinaryMessageHandler last_message_handler() { return last_message_handler_; }
44
45 std::vector<uint8_t> last_message() { return last_message_; }
46
47 private:
48 mutable bool send_called_ = false;
49 std::string last_message_handler_channel_;
50 BinaryMessageHandler last_message_handler_;
51 mutable std::vector<uint8_t> last_message_;
52 };
53
54 } // namespace
55
56 // Tests that SetMessageHandler sets a handler that correctly interacts with
57 // the binary messenger.
58 TEST(BasicMessageChannelTest, Registration) {
59 TestBinaryMessenger messenger;
60 const std::string channel_name("some_channel");
61 const StandardMessageCodec& codec = StandardMessageCodec::GetInstance();
62 BasicMessageChannel channel(&messenger, channel_name, &codec);
63
64 bool callback_called = false;
65 const std::string message_value("hello");
66 channel.SetMessageHandler(
67 [&callback_called, message_value](const auto& message, auto reply) {
68 callback_called = true;
69 // Ensure that the wrapper received a correctly decoded message and a
70 // reply.
71 EXPECT_EQ(std::get<std::string>(message), message_value);
72 EXPECT_NE(reply, nullptr);
73 });
74 EXPECT_EQ(messenger.last_message_handler_channel(), channel_name);
75 EXPECT_NE(messenger.last_message_handler(), nullptr);
76 // Send a test message to trigger the handler test assertions.
77 auto message = codec.EncodeMessage(EncodableValue(message_value));
78
79 messenger.last_message_handler()(
80 message->data(), message->size(),
81 [](const uint8_t* reply, const size_t reply_size) {});
82 EXPECT_EQ(callback_called, true);
83 }
84
85 // Tests that SetMessageHandler with a null handler unregisters the handler.
86 TEST(BasicMessageChannelTest, Unregistration) {
87 TestBinaryMessenger messenger;
88 const std::string channel_name("some_channel");
89 BasicMessageChannel channel(&messenger, channel_name,
90 &flutter::StandardMessageCodec::GetInstance());
91
92 channel.SetMessageHandler([](const auto& message, auto reply) {});
93 EXPECT_EQ(messenger.last_message_handler_channel(), channel_name);
94 EXPECT_NE(messenger.last_message_handler(), nullptr);
95
96 channel.SetMessageHandler(nullptr);
97 EXPECT_EQ(messenger.last_message_handler_channel(), channel_name);
98 EXPECT_EQ(messenger.last_message_handler(), nullptr);
99 }
100
101 // Tests that calling Resize generates the binary message expected by the Dart
102 // implementation.
103 TEST(BasicMessageChannelTest, Resize) {
104 TestBinaryMessenger messenger;
105 const std::string channel_name("flutter/test");
106 BasicMessageChannel channel(&messenger, channel_name,
107 &flutter::StandardMessageCodec::GetInstance());
108
109 channel.Resize(3);
110
111 // Because the Dart implementation for the control channel implements its own
112 // custom deserialization logic, this test compares the generated bytes array
113 // to the expected one (for instance, the deserialization logic expects the
114 // size parameter of the resize method call to be an uint32).
115 //
116 // The expected content was created from the following Dart code:
117 // MethodCall call = MethodCall('resize', ['flutter/test',3]);
118 // StandardMethodCodec().encodeMethodCall(call).buffer.asUint8List();
119 const int expected_message_size = 29;
120
121 EXPECT_EQ(messenger.send_called(), true);
122 EXPECT_EQ(static_cast<int>(messenger.last_message().size()),
123 expected_message_size);
124
125 int expected[expected_message_size] = {
126 7, 6, 114, 101, 115, 105, 122, 101, 12, 2, 7, 12, 102, 108, 117,
127 116, 116, 101, 114, 47, 116, 101, 115, 116, 3, 3, 0, 0, 0};
128 for (int i = 0; i < expected_message_size; i++) {
129 EXPECT_EQ(messenger.last_message()[i], expected[i]);
130 }
131 }
132
133 // Tests that calling SetWarnsOnOverflow generates the binary message expected
134 // by the Dart implementation.
135 TEST(BasicMessageChannelTest, SetWarnsOnOverflow) {
136 TestBinaryMessenger messenger;
137
138 const std::string channel_name("flutter/test");
139 BasicMessageChannel channel(&messenger, channel_name,
140 &flutter::StandardMessageCodec::GetInstance());
141
142 channel.SetWarnsOnOverflow(false);
143
144 // Because the Dart implementation for the control channel implements its own
145 // custom deserialization logic, this test compares the generated bytes array
146 // to the expected one.
147 //
148 // The expected content was created from the following Dart code:
149 // MethodCall call = MethodCall('overflow',['flutter/test', true]);
150 // StandardMethodCodec().encodeMethodCall(call).buffer.asUint8List();
151 const int expected_message_size = 27;
152
153 EXPECT_EQ(messenger.send_called(), true);
154 EXPECT_EQ(static_cast<int>(messenger.last_message().size()),
155 expected_message_size);
156
157 int expected[expected_message_size] = {
158 7, 8, 111, 118, 101, 114, 102, 108, 111, 119, 12, 2, 7, 12,
159 102, 108, 117, 116, 116, 101, 114, 47, 116, 101, 115, 116, 1};
160 for (int i = 0; i < expected_message_size; i++) {
161 EXPECT_EQ(messenger.last_message()[i], expected[i]);
162 }
163 }
164
165 } // namespace flutter
flutter::BasicMessageChannel::SetWarnsOnOverflow
void SetWarnsOnOverflow(bool warns)
Definition: basic_message_channel.h:137
flutter::BasicMessageChannel::SetMessageHandler
void SetMessageHandler(const MessageHandler< T > &handler) const
Definition: basic_message_channel.h:92
standard_method_codec.h
flutter::TEST
TEST(FlutterEngineTest, CreateDestroy)
Definition: flutter_engine_unittests.cc:103
binary_messenger.h
standard_message_codec.h
flutter::BasicMessageChannel
Definition: basic_message_channel.h:56
flutter::BinaryReply
std::function< void(const uint8_t *reply, size_t reply_size)> BinaryReply
Definition: binary_messenger.h:17
flutter
Definition: accessibility_bridge_windows.cc:11
flutter::StandardMessageCodec
Definition: standard_message_codec.h:18
basic_message_channel.h
flutter::EncodableValue
Definition: encodable_value.h:165
flutter::StandardMessageCodec::GetInstance
static const StandardMessageCodec & GetInstance(const StandardCodecSerializer *serializer=nullptr)
Definition: standard_codec.cc:293
flutter::MessageCodec::EncodeMessage
std::unique_ptr< std::vector< uint8_t > > EncodeMessage(const T &message) const
Definition: message_codec.h:45
message
Win32Message message
Definition: keyboard_unittests.cc:137
flutter::BasicMessageChannel::Resize
void Resize(int new_size)
Definition: basic_message_channel.h:128
flutter::BinaryMessageHandler
std::function< void(const uint8_t *message, size_t message_size, BinaryReply reply)> BinaryMessageHandler
Definition: binary_messenger.h:24