NotificationSubjectArgumentResolverTest.java

/*
 * Copyright 2013-2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License 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.
 */

package org.springframework.cloud.aws.messaging.support;

import com.fasterxml.jackson.databind.node.JsonNodeFactory;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.junit.Test;
import org.springframework.cloud.aws.core.support.documentation.RuntimeUse;
import org.springframework.cloud.aws.messaging.config.annotation.NotificationSubject;
import org.springframework.core.MethodParameter;
import org.springframework.messaging.Message;
import org.springframework.messaging.support.MessageBuilder;

import java.lang.reflect.Method;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

public class NotificationSubjectArgumentResolverTest {

    @Test
    public void supportsParameter_withNotificationSubjectMethodParameter_shouldReturnTrue() throws Exception {
        // Arrange
        NotificationSubjectArgumentResolver notificationSubjectArgumentResolver = new NotificationSubjectArgumentResolver();
        Method methodWithNotificationSubjectArgument = this.getClass().getDeclaredMethod("methodWithNotificationSubjectArgument", String.class);
        MethodParameter methodParameter = new MethodParameter(methodWithNotificationSubjectArgument, 0);

        // Act
        boolean result = notificationSubjectArgumentResolver.supportsParameter(methodParameter);

        // Assert
        assertTrue(result);
    }

    @SuppressWarnings("EmptyMethod")
    @RuntimeUse
    private void methodWithNotificationSubjectArgument(@NotificationSubject String subject) {
    }

    @Test
    public void supportsParameter_withWrongMethodParameter_shouldReturnFalse() throws Exception {
        // Arrange
        NotificationSubjectArgumentResolver notificationSubjectArgumentResolver = new NotificationSubjectArgumentResolver();
        Method methodWithMissingAnnotation = this.getClass().getDeclaredMethod("methodWithMissingAnnotation", String.class);
        MethodParameter methodParameter = new MethodParameter(methodWithMissingAnnotation, 0);

        // Act
        boolean result = notificationSubjectArgumentResolver.supportsParameter(methodParameter);

        // Assert
        assertFalse(result);
    }

    @SuppressWarnings("EmptyMethod")
    @RuntimeUse
    private void methodWithMissingAnnotation(String subject) {
    }

    @Test
    public void supportsParameter_withWrongParameterType_shouldReturnFalse() throws Exception {
        // Arrange
        NotificationSubjectArgumentResolver notificationSubjectArgumentResolver = new NotificationSubjectArgumentResolver();
        Method methodWithWrongParameterType = this.getClass().getDeclaredMethod("methodWithWrongParameterType", Long.class);
        MethodParameter methodParameter = new MethodParameter(methodWithWrongParameterType, 0);

        // Act
        boolean result = notificationSubjectArgumentResolver.supportsParameter(methodParameter);

        // Assert
        assertFalse(result);
    }

    @SuppressWarnings("EmptyMethod")
    @RuntimeUse
    private void methodWithWrongParameterType(@NotificationSubject Long subject) {
    }

    @Test
    public void resolveArgument_withValidRequestPayload_shouldReturnNotificationSubject() throws Exception {
        // Arrange
        NotificationSubjectArgumentResolver notificationSubjectArgumentResolver = new NotificationSubjectArgumentResolver();
        Method methodWithNotificationSubjectArgument = this.getClass().getDeclaredMethod("methodWithNotificationSubjectArgument", String.class);
        MethodParameter methodParameter = new MethodParameter(methodWithNotificationSubjectArgument, 0);

        ObjectNode jsonObject = JsonNodeFactory.instance.objectNode();
        jsonObject.put("Type", "Notification");
        jsonObject.put("Subject", "My subject!");
        jsonObject.put("Message", "message");
        String payload = jsonObject.toString();
        Message<String> message = MessageBuilder.withPayload(payload).build();

        // Act
        Object result = notificationSubjectArgumentResolver.resolveArgument(methodParameter, message);

        // Assert
        assertTrue(String.class.isInstance(result));
        assertEquals("My subject!", result);
    }

}