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drake_lcm_interface_test.cc
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drake_lcm_interface_test.cc
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#include "drake/lcm/drake_lcm_interface.h"
#include <stdexcept>
#include <string>
#include <gtest/gtest.h>
#include "drake/common/drake_assert.h"
#include "drake/common/test_utilities/expect_throws_message.h"
#include "drake/lcm/drake_lcm.h"
#include "drake/lcm/lcmt_drake_signal_utils.h"
#include "drake/lcmt_drake_signal.hpp"
// This file contains acceptance tests of the sugar functions and classes
// declared in drake_lcm_interface.h.
//
// Since DrakeLcmInterface and DrakeSubscription are pure virtual, we end up
// using DrakeLcm's implementation of them and presuming its correctness in
// these test cases.
namespace drake {
namespace lcm {
namespace {
class DrakeLcmInterfaceTest : public ::testing::Test {
public:
using Message = lcmt_drake_signal;
DrakeLcmInterfaceTest() {
sample_.timestamp = 123;
sample_.dim = 1;
sample_.coord.emplace_back("x");
sample_.val.emplace_back(1.0);
const int num_bytes = sample_.getEncodedSize();
DRAKE_DEMAND(num_bytes >= 0);
sample_bytes_.resize(static_cast<size_t>(num_bytes));
sample_.encode(sample_bytes_.data(), 0, num_bytes);
}
protected:
DrakeLcm lcm_;
const std::string channel_ = "NAME";
// A convenient, populated sample message and its encoded form.
Message sample_{};
std::vector<uint8_t> sample_bytes_;
};
// Tests the Subscribe + Publish free functions under nominal conditions.
TEST_F(DrakeLcmInterfaceTest, FreeFunctionPubSubTest) {
// Subscribe using the helper free-function.
Message received{};
Subscribe<Message>(&lcm_, channel_, [&](const Message& message) {
received = message;
});
// Publish using the helper free-function.
Publish(&lcm_, channel_, sample_);
EXPECT_EQ(lcm_.HandleSubscriptions(0), 1);
EXPECT_TRUE(CompareLcmtDrakeSignalMessages(received, sample_));
}
// Tests the Subscribe free function's default error handling.
TEST_F(DrakeLcmInterfaceTest, DefaultErrorHandlingTest) {
// Subscribe using the helper free-function, using default error-handling.
Message received{};
Subscribe<Message>(&lcm_, channel_, [&](const Message& message) {
received = message;
});
// Publish successfully.
lcm_.Publish(channel_, sample_bytes_.data(), sample_bytes_.size(), {});
EXPECT_EQ(lcm_.HandleSubscriptions(0), 1);
EXPECT_TRUE(CompareLcmtDrakeSignalMessages(received, sample_));
received = {};
// Corrupt the message.
std::vector<uint8_t> corrupt_bytes = sample_bytes_;
corrupt_bytes.at(0) = 0;
lcm_.Publish(channel_, corrupt_bytes.data(), corrupt_bytes.size(), {});
DRAKE_EXPECT_THROWS_MESSAGE(lcm_.HandleSubscriptions(0),
"Error decoding message on NAME");
EXPECT_TRUE(CompareLcmtDrakeSignalMessages(received, Message{}));
received = {};
// We can still publish successfully.
lcm_.Publish(channel_, sample_bytes_.data(), sample_bytes_.size(), {});
EXPECT_EQ(lcm_.HandleSubscriptions(0), 1);
EXPECT_TRUE(CompareLcmtDrakeSignalMessages(received, sample_));
received = {};
}
// Tests that the Subscribe free function can throw exceptions.
TEST_F(DrakeLcmInterfaceTest, HandlerExceptionTest) {
Message received{};
Subscribe<Message>(&lcm_, channel_, [&](const Message& message) {
DRAKE_THROW_UNLESS(message.dim > 0);
received = message;
});
// Publish successfully.
Publish(&lcm_, channel_, sample_);
EXPECT_EQ(lcm_.HandleSubscriptions(0), 1);
EXPECT_TRUE(CompareLcmtDrakeSignalMessages(received, sample_));
received = {};
// Publish a message that correctly decodes, but is rejected by the user's
// handler callback.
const Message empty{};
Publish(&lcm_, channel_, empty);
DRAKE_EXPECT_THROWS_MESSAGE(lcm_.HandleSubscriptions(0),
".*callback.*dim > 0.*failed.*");
// We can still publish successfully.
sample_.val.at(0) = 2.0;
Publish(&lcm_, channel_, sample_);
EXPECT_EQ(lcm_.HandleSubscriptions(0), 1);
EXPECT_TRUE(CompareLcmtDrakeSignalMessages(received, sample_));
}
// Tests the Subscribe free function's customizable error handling.
TEST_F(DrakeLcmInterfaceTest, CustomErrorHandlingTest) {
// Subscribe using the helper free-function, using default error-handling.
Message received{};
bool error = false;
Subscribe<Message>(
&lcm_, channel_,
[&](const Message& message) {
received = message;
},
[&]() {
error = true;
});
// Publish successfully.
lcm_.Publish(channel_, sample_bytes_.data(), sample_bytes_.size(), {});
EXPECT_EQ(lcm_.HandleSubscriptions(0), 1);
EXPECT_TRUE(CompareLcmtDrakeSignalMessages(received, sample_));
EXPECT_FALSE(error);
received = {};
// Corrupt the message.
std::vector<uint8_t> corrupt_bytes = sample_bytes_;
corrupt_bytes.at(0) = 0;
lcm_.Publish(channel_, corrupt_bytes.data(), corrupt_bytes.size(), {});
EXPECT_EQ(lcm_.HandleSubscriptions(0), 1);
EXPECT_TRUE(CompareLcmtDrakeSignalMessages(received, Message{}));
EXPECT_TRUE(error);
}
// Tests the Subscriber class.
TEST_F(DrakeLcmInterfaceTest, SubscriberTest) {
// Subscribe using the helper class.
Subscriber<Message> dut(&lcm_, channel_);
EXPECT_EQ(dut.count(), 0);
EXPECT_EQ(dut.message().timestamp, 0);
// Publish using the helper free-function.
Publish(&lcm_, channel_, sample_);
EXPECT_EQ(lcm_.HandleSubscriptions(0), 1);
EXPECT_EQ(dut.count(), 1);
EXPECT_TRUE(CompareLcmtDrakeSignalMessages(dut.message(), sample_));
// Second publish.
Publish(&lcm_, channel_, sample_);
EXPECT_EQ(lcm_.HandleSubscriptions(0), 1);
EXPECT_EQ(dut.count(), 2);
EXPECT_TRUE(CompareLcmtDrakeSignalMessages(dut.message(), sample_));
// Clear.
dut.clear();
EXPECT_EQ(dut.count(), 0);
EXPECT_EQ(dut.message().timestamp, 0);
// Another publish.
for (int i = 1; i <= 11; ++i) {
Publish(&lcm_, channel_, sample_);
EXPECT_EQ(lcm_.HandleSubscriptions(0), 1);
EXPECT_EQ(dut.count(), i);
}
}
// Tests the LcmHandleSubscriptionsUntil free function.
TEST_F(DrakeLcmInterfaceTest, HandleUntilTest) {
Subscriber<Message> sub(&lcm_, channel_);
int num_invocations = 0;
int num_handled_messages = LcmHandleSubscriptionsUntil(&lcm_, [&]() {
++num_invocations;
Publish(&lcm_, channel_, sample_);
return sub.count() > 0;
});
EXPECT_GE(num_invocations, 2);
EXPECT_GE(sub.count(), 1);
EXPECT_GE(num_handled_messages, 1);
}
} // namespace
} // namespace lcm
} // namespace drake