TypeExtractorMethodReturnTest.java

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 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
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 *
 *        http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.isis.core.runtime.system;

import static org.apache.isis.core.commons.matchers.IsisMatchers.containsElementThat;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;

import java.lang.reflect.Method;
import java.util.List;

import org.junit.Test;

import org.apache.isis.core.metamodel.specloader.traverser.TypeExtractorMethodReturn;

public class TypeExtractorMethodReturnTest {

    @Test
    public void shouldFindGenericTypes() throws Exception {

        class Customer {
        }
        class CustomerRepository {
            @SuppressWarnings("unused")
            public List<Customer> findCustomers() {
                return null;
            }
        }

        final Class<?> clazz = CustomerRepository.class;
        final Method method = clazz.getMethod("findCustomers");

        final TypeExtractorMethodReturn extractor = new TypeExtractorMethodReturn(method);

        final List<Class<?>> classes = extractor.getClasses();
        assertThat(classes.size(), is(2));
        assertThat(classes, containsElementThat(equalTo((Class<?>)java.util.List.class)));
        assertThat(classes, containsElementThat(equalTo((Class<?>)Customer.class)));
    }

    @Test
    public void ignoresVoidType() throws Exception {

        class CustomerRepository {
            @SuppressWarnings("unused")
            public void findCustomers() {
            }
        }

        final Class<?> clazz = CustomerRepository.class;
        final Method method = clazz.getMethod("findCustomers");

        final TypeExtractorMethodReturn extractor = new TypeExtractorMethodReturn(method);

        assertThat(extractor.getClasses().size(), is(0));
    }

}