vshl-capabilities:

This API is responsible for brokering capbilities related
messages from voiceagents to apps and vice versa.

Verbs exposed are

navigation/publish
navigation/subscribe
phonecontrol/publish
phonecontrol/subscribe
playbackcontroller/publish
playbackcontroller/subscribe
guiMetadata/publish
guiMetadata/subscribe

This API exposes publish and subscribe methods for all
the speech framework domains/capabilities. For eg. navigation,
phonecontrol etc. This API is used by apps and low level voice
agent binding to subscribe and publish these capability messages
whenever applicable.
This specific commit is for vshl-capabilities API.

Change-Id: I822c2e8589e39574d707a7c199bea91a686dced7
Signed-off-by: Naveen Bobbili  <nbobbili@amazon.com>

3 files changed, 474 insertions, 0 deletions

diff --git a/src/plugins/capabilities/test/CapabilityMessagingServiceTest.cpp b/src/plugins/capabilities/test/CapabilityMessagingServiceTest.cpp
new file mode 100644
index 0000000..5d3971d
--- /dev/null
+++ b/src/plugins/capabilities/test/CapabilityMessagingServiceTest.cpp
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2018-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *     http://aws.amazon.com/apache2.0/
+ *
+ * or in the "license" file accompanying this file. This file is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+#include <gtest/gtest.h>
+
+#include "capabilities/CapabilityMessagingService.h"
+
+#include "test/common/ConsoleLogger.h"
+#include "test/mocks/AFBApiMock.h"
+#include "test/mocks/AFBEventMock.h"
+#include "test/mocks/AFBRequestMock.h"
+#include "test/mocks/CapabilityMock.h"
+
+using namespace vshlcapabilities::common::interfaces;
+using namespace vshlcapabilities::capabilities;
+using namespace vshlcapabilities::test::common;
+
+namespace vshlcapabilities {
+namespace test {
+
+class CapabilityMessagingServiceTest : public ::testing::Test {
+protected:
+    void SetUp() override {
+        mConsoleLogger = std::make_shared<ConsoleLogger>();
+        mAfbApi = std::make_shared<::testing::NiceMock<AFBApiMock>>();
+    }
+
+    std::shared_ptr<::testing::NiceMock<AFBApiMock>> mAfbApi;
+    std::shared_ptr<ConsoleLogger> mConsoleLogger;
+};
+
+TEST_F(CapabilityMessagingServiceTest, failsInitializationOnInvalidParams) {
+    auto service = CapabilityMessagingService::create(mConsoleLogger, nullptr);
+    ASSERT_EQ(service, nullptr);
+
+    service = CapabilityMessagingService::create(nullptr, mAfbApi);
+    ASSERT_EQ(service, nullptr);
+}
+
+TEST_F(CapabilityMessagingServiceTest, initializesSuccessfully) {
+    auto service = CapabilityMessagingService::create(mConsoleLogger, mAfbApi);
+    ASSERT_NE(service, nullptr);
+}
+
+TEST_F(CapabilityMessagingServiceTest, canSubscribeAndPublishCapabilityEvents) {
+    auto service = CapabilityMessagingService::create(mConsoleLogger, mAfbApi);
+
+    auto capability = std::make_shared<::testing::NiceMock<CapabilityMock>>();
+    std::list<std::string> upstreamEvents({"up-ev1", "up-ev2"});
+    std::list<std::string> downstreamEvents({"down-ev1", "down-ev2"});
+    std::string capabilityName = "weather";
+
+    ON_CALL(*capability, getName()).WillByDefault(::testing::Return(capabilityName));
+    ON_CALL(*capability, getUpstreamMessages()).WillByDefault(::testing::Return(upstreamEvents));
+    ON_CALL(*capability, getDownstreamMessages()).WillByDefault(::testing::Return(downstreamEvents));
+
+    // We don't care if and how many times subscribe method is called on event.
+    std::shared_ptr<AFBEventMock> mockEvent(new ::testing::NiceMock<AFBEventMock>());
+    ON_CALL(*mockEvent, subscribe(::testing::_)).WillByDefault(::testing::Return(true));
+    ON_CALL(*mockEvent, publishEvent(::testing::_)).WillByDefault(::testing::Return(true));
+    auto eventCreator = [mockEvent](const std::string& eventName) -> std::shared_ptr<IAFBApi::IAFBEvent> {
+        mockEvent->setName(eventName);
+        return mockEvent;
+    };
+
+    ON_CALL(*mAfbApi, createEvent(::testing::_)).WillByDefault(::testing::Invoke(eventCreator));
+
+    auto request = std::make_shared<::testing::StrictMock<AFBRequestMock>>();
+    std::string payload = "The answer to life the universe and everything = 42";
+
+    bool result = service->publish(capability, *upstreamEvents.begin(), payload);
+    ASSERT_FALSE(result);  // Without subscribing to the event. Publish should fail.
+
+    result = service->subscribe(*request, capability, *upstreamEvents.begin());
+    ASSERT_TRUE(result);
+
+    result = service->subscribe(*request, capability, *downstreamEvents.begin());
+    ASSERT_TRUE(result);
+
+    result = service->publish(capability, *downstreamEvents.begin(), payload);
+    ASSERT_TRUE(result);
+}
+
+}  // namespace test
+}  // namespace vshl
\ No newline at end of file
diff --git a/src/plugins/capabilities/test/PublisherForwarderTest.cpp b/src/plugins/capabilities/test/PublisherForwarderTest.cpp
new file mode 100644
index 0000000..8fb499c
--- /dev/null
+++ b/src/plugins/capabilities/test/PublisherForwarderTest.cpp
@@ -0,0 +1,116 @@
+/*
+ * Copyright 2018-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *     http://aws.amazon.com/apache2.0/
+ *
+ * or in the "license" file accompanying this file. This file is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+#include <gtest/gtest.h>
+
+#include "capabilities/core/include/PublisherForwarder.h"
+#include "capabilities/core/include/SubscriberForwarder.h"
+
+#include "test/common/ConsoleLogger.h"
+#include "test/mocks/AFBApiMock.h"
+#include "test/mocks/AFBEventMock.h"
+#include "test/mocks/CapabilityMock.h"
+
+using namespace vshlcapabilities::common::interfaces;
+using namespace vshlcapabilities::capabilities::core;
+using namespace vshlcapabilities::test::common;
+
+namespace vshlcapabilities {
+namespace test {
+
+class PublisherForwarderTest : public ::testing::Test {
+protected:
+    void SetUp() override {
+        mConsoleLogger = std::make_shared<ConsoleLogger>();
+        mAfbApi = std::make_shared<::testing::StrictMock<AFBApiMock>>();
+
+        mEventCreatorFn = [](const std::string& eventName) -> std::shared_ptr<IAFBApi::IAFBEvent> {
+            std::shared_ptr<AFBEventMock> mockEvent(new ::testing::StrictMock<AFBEventMock>());
+            mockEvent->setName(eventName);
+            return mockEvent;
+        };
+    }
+
+    std::shared_ptr<SubscriberForwarder> createSubscriberForwarder(
+        std::shared_ptr<::testing::StrictMock<CapabilityMock>> capability) {
+        EXPECT_CALL(*capability, getUpstreamMessages()).Times(1);
+        EXPECT_CALL(*capability, getDownstreamMessages()).Times(1);
+
+        return SubscriberForwarder::create(mConsoleLogger, mAfbApi, capability);
+    }
+
+    std::shared_ptr<PublisherForwarder> createPublisherForwarder(
+        std::shared_ptr<::testing::StrictMock<CapabilityMock>> capability) {
+        return PublisherForwarder::create(mConsoleLogger, capability);
+    }
+
+    std::shared_ptr<::testing::StrictMock<AFBApiMock>> mAfbApi;
+    std::shared_ptr<ConsoleLogger> mConsoleLogger;
+    std::function<std::shared_ptr<IAFBApi::IAFBEvent>(const std::string&)> mEventCreatorFn;
+    std::shared_ptr<::testing::StrictMock<AFBEventMock>> mAfbEventMock;
+};
+
+TEST_F(PublisherForwarderTest, failsInitializationOnInvalidParams) {
+    auto capability = std::make_shared<::testing::StrictMock<CapabilityMock>>();
+
+    auto forwarder = PublisherForwarder::create(mConsoleLogger, nullptr);
+    ASSERT_EQ(forwarder, nullptr);
+
+    forwarder = PublisherForwarder::create(nullptr, capability);
+    ASSERT_EQ(forwarder, nullptr);
+}
+
+TEST_F(PublisherForwarderTest, initializesCorrectly) {
+    auto capability = std::make_shared<::testing::StrictMock<CapabilityMock>>();
+    auto forwarder = createPublisherForwarder(capability);
+
+    ASSERT_NE(forwarder, nullptr);
+}
+
+TEST_F(PublisherForwarderTest, canForwardMessages) {
+    std::shared_ptr<AFBEventMock> mockEvent(new ::testing::StrictMock<AFBEventMock>());
+    ON_CALL(*mockEvent, publishEvent(::testing::_)).WillByDefault(::testing::Return(true));
+    EXPECT_CALL(*mockEvent, publishEvent(::testing::_)).Times(4);
+    auto eventCreator = [mockEvent](const std::string& eventName) -> std::shared_ptr<IAFBApi::IAFBEvent> {
+        return mockEvent;
+    };
+
+    ON_CALL(*mAfbApi, createEvent(::testing::_)).WillByDefault(::testing::Invoke(eventCreator));
+    EXPECT_CALL(*mAfbApi, createEvent(::testing::_)).Times(4);
+
+    auto capability = std::make_shared<::testing::StrictMock<CapabilityMock>>();
+    std::list<std::string> upstreamEvents({"up-ev1", "up-ev2"});
+    std::list<std::string> downstreamEvents({"down-ev1", "down-ev2"});
+    ON_CALL(*capability, getUpstreamMessages()).WillByDefault(::testing::Return(upstreamEvents));
+    ON_CALL(*capability, getDownstreamMessages()).WillByDefault(::testing::Return(downstreamEvents));
+
+    auto publisherForwarder = createPublisherForwarder(capability);
+    ASSERT_NE(publisherForwarder, nullptr);
+
+    auto subscriberForwarder = createSubscriberForwarder(capability);
+    ASSERT_NE(subscriberForwarder, nullptr);
+
+    std::string payload = "The answer to life the universe and everything = 42";
+    publisherForwarder->setSubscriberForwarder(subscriberForwarder);
+
+    auto itCapability = downstreamEvents.begin();
+    ASSERT_TRUE(publisherForwarder->forwardMessage(*itCapability++, payload));
+    ASSERT_TRUE(publisherForwarder->forwardMessage(*itCapability++, payload));
+    itCapability = upstreamEvents.begin();
+    ASSERT_TRUE(publisherForwarder->forwardMessage(*itCapability++, payload));
+    ASSERT_TRUE(publisherForwarder->forwardMessage(*itCapability++, payload));
+}
+
+}  // namespace test
+}  // namespace vshl
\ No newline at end of file
diff --git a/src/plugins/capabilities/test/SubscriberForwarderTest.cpp b/src/plugins/capabilities/test/SubscriberForwarderTest.cpp
new file mode 100644
index 0000000..c3d72de
--- /dev/null
+++ b/src/plugins/capabilities/test/SubscriberForwarderTest.cpp
@@ -0,0 +1,262 @@
+/*
+ * Copyright 2018-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *     http://aws.amazon.com/apache2.0/
+ *
+ * or in the "license" file accompanying this file. This file is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+#include <gtest/gtest.h>
+
+#include "capabilities/core/include/SubscriberForwarder.h"
+
+#include "test/common/ConsoleLogger.h"
+#include "test/mocks/AFBApiMock.h"
+#include "test/mocks/AFBEventMock.h"
+#include "test/mocks/AFBRequestMock.h"
+#include "test/mocks/CapabilityMock.h"
+
+using namespace vshlcapabilities::common::interfaces;
+using namespace vshlcapabilities::capabilities::core;
+using namespace vshlcapabilities::test::common;
+
+namespace vshlcapabilities {
+namespace test {
+
+class SubscriberForwarderTest : public ::testing::Test {
+protected:
+    void SetUp() override {
+        mConsoleLogger = std::make_shared<ConsoleLogger>();
+        mAfbApi = std::make_shared<::testing::StrictMock<AFBApiMock>>();
+
+        mEventCreatorFn = [](const std::string& eventName) -> std::shared_ptr<IAFBApi::IAFBEvent> {
+            std::shared_ptr<AFBEventMock> mockEvent(new ::testing::StrictMock<AFBEventMock>());
+            mockEvent->setName(eventName);
+            return mockEvent;
+        };
+    }
+
+    std::shared_ptr<SubscriberForwarder> createSubscriberForwarder(
+        std::shared_ptr<::testing::StrictMock<CapabilityMock>> capability) {
+        EXPECT_CALL(*capability, getUpstreamMessages()).Times(1);
+        EXPECT_CALL(*capability, getDownstreamMessages()).Times(1);
+
+        return SubscriberForwarder::create(mConsoleLogger, mAfbApi, capability);
+    }
+
+    std::shared_ptr<::testing::StrictMock<AFBApiMock>> mAfbApi;
+    std::shared_ptr<ConsoleLogger> mConsoleLogger;
+    std::function<std::shared_ptr<IAFBApi::IAFBEvent>(const std::string&)> mEventCreatorFn;
+    std::shared_ptr<::testing::StrictMock<AFBEventMock>> mAfbEventMock;
+};
+
+TEST_F(SubscriberForwarderTest, failsInitializationOnInvalidParams) {
+    auto capability = std::make_shared<::testing::StrictMock<CapabilityMock>>();
+
+    auto forwarder = SubscriberForwarder::create(mConsoleLogger, mAfbApi, nullptr);
+    ASSERT_EQ(forwarder, nullptr);
+
+    forwarder = SubscriberForwarder::create(mConsoleLogger, nullptr, capability);
+    ASSERT_EQ(forwarder, nullptr);
+
+    forwarder = SubscriberForwarder::create(nullptr, mAfbApi, capability);
+    ASSERT_EQ(forwarder, nullptr);
+}
+
+TEST_F(SubscriberForwarderTest, initializesCorrectly) {
+    auto capability = std::make_shared<::testing::StrictMock<CapabilityMock>>();
+    auto forwarder = createSubscriberForwarder(capability);
+
+    ASSERT_NE(forwarder, nullptr);
+}
+
+TEST_F(SubscriberForwarderTest, createsEventsOnInitialization) {
+    ON_CALL(*mAfbApi, createEvent(::testing::_)).WillByDefault(::testing::Invoke(mEventCreatorFn));
+
+    std::list<std::string> upstreamEvents({"up-ev1", "up-ev2"});
+    std::list<std::string> downstreamEvents({"down-ev1", "down-ev2"});
+
+    auto capability = std::make_shared<::testing::StrictMock<CapabilityMock>>();
+    ON_CALL(*capability, getUpstreamMessages()).WillByDefault(::testing::Return(upstreamEvents));
+    ON_CALL(*capability, getDownstreamMessages()).WillByDefault(::testing::Return(downstreamEvents));
+
+    auto itCapability = upstreamEvents.begin();
+    EXPECT_CALL(*mAfbApi, createEvent(*itCapability)).Times(1);
+    itCapability++;
+    EXPECT_CALL(*mAfbApi, createEvent(*itCapability)).Times(1);
+
+    itCapability = downstreamEvents.begin();
+    EXPECT_CALL(*mAfbApi, createEvent(*itCapability)).Times(1);
+    itCapability++;
+    EXPECT_CALL(*mAfbApi, createEvent(*itCapability)).Times(1);
+
+    auto forwarder = createSubscriberForwarder(capability);
+    ASSERT_NE(forwarder, nullptr);
+}
+
+TEST_F(SubscriberForwarderTest, canNotSubscribeToNonExistentEvents) {
+    ON_CALL(*mAfbApi, createEvent(::testing::_)).WillByDefault(::testing::Invoke(mEventCreatorFn));
+    EXPECT_CALL(*mAfbApi, createEvent(::testing::_)).Times(4);
+
+    std::list<std::string> upstreamEvents({"up-ev1", "up-ev2"});
+    std::list<std::string> downstreamEvents({"down-ev1", "down-ev2"});
+
+    auto capability = std::make_shared<::testing::StrictMock<CapabilityMock>>();
+    ON_CALL(*capability, getUpstreamMessages()).WillByDefault(::testing::Return(upstreamEvents));
+    ON_CALL(*capability, getDownstreamMessages()).WillByDefault(::testing::Return(downstreamEvents));
+
+    auto forwarder = createSubscriberForwarder(capability);
+    ASSERT_NE(forwarder, nullptr);
+
+    auto nonExistentEvents = std::list<std::string>({"non", "existent", "events"});
+    auto itCapability = nonExistentEvents.begin();
+    auto request = std::make_shared<::testing::StrictMock<AFBRequestMock>>();
+    ASSERT_FALSE(forwarder->subscribe(*request, *itCapability++));
+    ASSERT_FALSE(forwarder->subscribe(*request, *itCapability++));
+    ASSERT_FALSE(forwarder->subscribe(*request, *itCapability++));
+}
+
+TEST_F(SubscriberForwarderTest, canNotSubscribeOnEventCreationFailure) {
+    // Fail the event creation and return null event.
+    ON_CALL(*mAfbApi, createEvent(::testing::_)).WillByDefault(::testing::Return(nullptr));
+    EXPECT_CALL(*mAfbApi, createEvent(::testing::_)).Times(4);
+
+    std::list<std::string> upstreamEvents({"up-ev1", "up-ev2"});
+    std::list<std::string> downstreamEvents({"down-ev1", "down-ev2"});
+
+    auto capability = std::make_shared<::testing::StrictMock<CapabilityMock>>();
+    ON_CALL(*capability, getUpstreamMessages()).WillByDefault(::testing::Return(upstreamEvents));
+    ON_CALL(*capability, getDownstreamMessages()).WillByDefault(::testing::Return(downstreamEvents));
+
+    auto forwarder = createSubscriberForwarder(capability);
+    ASSERT_NE(forwarder, nullptr);
+
+    auto itCapability = downstreamEvents.begin();
+    auto request = std::make_shared<::testing::StrictMock<AFBRequestMock>>();
+    std::string payload = "The answer to life the universe and everything = 42";
+    ASSERT_FALSE(forwarder->subscribe(*request, *itCapability++));
+    ASSERT_FALSE(forwarder->subscribe(*request, *itCapability++));
+    itCapability = upstreamEvents.begin();
+    ASSERT_FALSE(forwarder->subscribe(*request, *itCapability++));
+    ASSERT_FALSE(forwarder->subscribe(*request, *itCapability++));
+}
+
+TEST_F(SubscriberForwarderTest, canSubscribeToEvents) {
+    std::shared_ptr<AFBEventMock> mockEvent(new ::testing::StrictMock<AFBEventMock>());
+    ON_CALL(*mockEvent, subscribe(::testing::_)).WillByDefault(::testing::Return(true));
+    EXPECT_CALL(*mockEvent, subscribe(::testing::_)).Times(4);
+    auto eventCreator = [mockEvent](const std::string& eventName) -> std::shared_ptr<IAFBApi::IAFBEvent> {
+        return mockEvent;
+    };
+
+    ON_CALL(*mAfbApi, createEvent(::testing::_)).WillByDefault(::testing::Invoke(eventCreator));
+    EXPECT_CALL(*mAfbApi, createEvent(::testing::_)).Times(4);
+
+    std::list<std::string> upstreamEvents({"up-ev1", "up-ev2"});
+    std::list<std::string> downstreamEvents({"down-ev1", "down-ev2"});
+
+    auto capability = std::make_shared<::testing::StrictMock<CapabilityMock>>();
+    ON_CALL(*capability, getUpstreamMessages()).WillByDefault(::testing::Return(upstreamEvents));
+    ON_CALL(*capability, getDownstreamMessages()).WillByDefault(::testing::Return(downstreamEvents));
+
+    auto forwarder = createSubscriberForwarder(capability);
+    ASSERT_NE(forwarder, nullptr);
+
+    auto itCapability = downstreamEvents.begin();
+    auto request = std::make_shared<::testing::StrictMock<AFBRequestMock>>();
+    ASSERT_TRUE(forwarder->subscribe(*request, *itCapability++));
+    ASSERT_TRUE(forwarder->subscribe(*request, *itCapability));
+    itCapability = upstreamEvents.begin();
+    ASSERT_TRUE(forwarder->subscribe(*request, *itCapability++));
+    ASSERT_TRUE(forwarder->subscribe(*request, *itCapability));
+}
+
+TEST_F(SubscriberForwarderTest, canNotPublishNonExistentEvents) {
+    std::shared_ptr<AFBEventMock> mockEvent(new ::testing::StrictMock<AFBEventMock>());
+    EXPECT_CALL(*mockEvent, publishEvent(::testing::_)).Times(0);
+    auto eventCreator = [mockEvent](const std::string& eventName) -> std::shared_ptr<IAFBApi::IAFBEvent> {
+        return mockEvent;
+    };
+
+    ON_CALL(*mAfbApi, createEvent(::testing::_)).WillByDefault(::testing::Invoke(eventCreator));
+    EXPECT_CALL(*mAfbApi, createEvent(::testing::_)).Times(4);
+
+    std::list<std::string> upstreamEvents({"up-ev1", "up-ev2"});
+    std::list<std::string> downstreamEvents({"down-ev1", "down-ev2"});
+
+    auto capability = std::make_shared<::testing::StrictMock<CapabilityMock>>();
+    ON_CALL(*capability, getUpstreamMessages()).WillByDefault(::testing::Return(upstreamEvents));
+    ON_CALL(*capability, getDownstreamMessages()).WillByDefault(::testing::Return(downstreamEvents));
+
+    auto forwarder = createSubscriberForwarder(capability);
+    ASSERT_NE(forwarder, nullptr);
+
+    auto nonExistentEvents = std::list<std::string>({"non", "existent", "events"});
+    auto itCapability = nonExistentEvents.begin();
+    ASSERT_FALSE(forwarder->forwardMessage(*itCapability++, "My-Payload"));
+    ASSERT_FALSE(forwarder->forwardMessage(*itCapability++, "My-Payload"));
+    ASSERT_FALSE(forwarder->forwardMessage(*itCapability++, "My-Payload"));
+}
+
+TEST_F(SubscriberForwarderTest, canNotPublishOnEventCreationFailure) {
+    // Fail the event creation and return null event.
+    ON_CALL(*mAfbApi, createEvent(::testing::_)).WillByDefault(::testing::Return(nullptr));
+    EXPECT_CALL(*mAfbApi, createEvent(::testing::_)).Times(4);
+
+    std::list<std::string> upstreamEvents({"up-ev1", "up-ev2"});
+    std::list<std::string> downstreamEvents({"down-ev1", "down-ev2"});
+
+    auto capability = std::make_shared<::testing::StrictMock<CapabilityMock>>();
+    ON_CALL(*capability, getUpstreamMessages()).WillByDefault(::testing::Return(upstreamEvents));
+    ON_CALL(*capability, getDownstreamMessages()).WillByDefault(::testing::Return(downstreamEvents));
+
+    auto forwarder = createSubscriberForwarder(capability);
+    ASSERT_NE(forwarder, nullptr);
+
+    auto itCapability = downstreamEvents.begin();
+    std::string payload = "The answer to life the universe and everything = 42";
+    ASSERT_FALSE(forwarder->forwardMessage(*itCapability++, payload));
+    ASSERT_FALSE(forwarder->forwardMessage(*itCapability++, payload));
+    itCapability = upstreamEvents.begin();
+    ASSERT_FALSE(forwarder->forwardMessage(*itCapability++, payload));
+    ASSERT_FALSE(forwarder->forwardMessage(*itCapability++, payload));
+}
+
+TEST_F(SubscriberForwarderTest, canPublishEvents) {
+    std::shared_ptr<AFBEventMock> mockEvent(new ::testing::StrictMock<AFBEventMock>());
+    ON_CALL(*mockEvent, publishEvent(::testing::_)).WillByDefault(::testing::Return(true));
+    EXPECT_CALL(*mockEvent, publishEvent(::testing::_)).Times(4);
+    auto eventCreator = [mockEvent](const std::string& eventName) -> std::shared_ptr<IAFBApi::IAFBEvent> {
+        return mockEvent;
+    };
+
+    ON_CALL(*mAfbApi, createEvent(::testing::_)).WillByDefault(::testing::Invoke(eventCreator));
+    EXPECT_CALL(*mAfbApi, createEvent(::testing::_)).Times(4);
+
+    std::list<std::string> upstreamEvents({"up-ev1", "up-ev2"});
+    std::list<std::string> downstreamEvents({"down-ev1", "down-ev2"});
+
+    auto capability = std::make_shared<::testing::StrictMock<CapabilityMock>>();
+    ON_CALL(*capability, getUpstreamMessages()).WillByDefault(::testing::Return(upstreamEvents));
+    ON_CALL(*capability, getDownstreamMessages()).WillByDefault(::testing::Return(downstreamEvents));
+
+    auto forwarder = createSubscriberForwarder(capability);
+    ASSERT_NE(forwarder, nullptr);
+
+    auto itCapability = downstreamEvents.begin();
+    std::string payload = "The answer to life the universe and everything = 42";
+    ASSERT_TRUE(forwarder->forwardMessage(*itCapability++, payload));
+    ASSERT_TRUE(forwarder->forwardMessage(*itCapability++, payload));
+    itCapability = upstreamEvents.begin();
+    ASSERT_TRUE(forwarder->forwardMessage(*itCapability++, payload));
+    ASSERT_TRUE(forwarder->forwardMessage(*itCapability++, payload));
+}
+
+}  // namespace test
+}  // namespace vshl
\ No newline at end of file