org.hobsoft.symmetry.spring.SymmetryMethodArgumentResolverTest.java Source code

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Here is the source code for org.hobsoft.symmetry.spring.SymmetryMethodArgumentResolverTest.java

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/*
 * 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.hobsoft.symmetry.spring;

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

import org.hobsoft.symmetry.Reflector;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.ArgumentCaptor;
import org.mockito.Captor;
import org.mockito.runners.MockitoJUnitRunner;
import org.springframework.core.MethodParameter;
import org.springframework.mock.web.MockHttpServletRequest;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.context.request.ServletWebRequest;
import org.springframework.web.method.support.ModelAndViewContainer;

import static org.hamcrest.CoreMatchers.instanceOf;
import static org.hamcrest.Matchers.arrayContaining;
import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
import static org.mockito.Matchers.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

/**
 * Tests {@code SymmetryMethodArgumentResolver}.
 */
@RunWith(MockitoJUnitRunner.class)
public class SymmetryMethodArgumentResolverTest {
    // ----------------------------------------------------------------------------------------------------------------
    // types
    // ----------------------------------------------------------------------------------------------------------------

    private static class DummyComponent {
        // dummy type
    }

    private static class DummySubcomponent extends DummyComponent {
        // dummy type
    }

    // ----------------------------------------------------------------------------------------------------------------
    // fields
    // ----------------------------------------------------------------------------------------------------------------

    @Captor
    private ArgumentCaptor<Map<String, String[]>> stateCaptor;

    // ----------------------------------------------------------------------------------------------------------------
    // tests
    // ----------------------------------------------------------------------------------------------------------------

    @Test
    public void supportsParameterWithComponentTypeReturnsTrue() throws NoSuchMethodException {
        Reflector<DummyComponent> reflector = mockReflector(DummyComponent.class);

        boolean actual = newResolver(reflector).supportsParameter(dummyComponentParameter());

        assertThat(actual, is(true));
    }

    @Test
    public void supportsParameterWithComponentSubtypeReturnsTrue() throws NoSuchMethodException {
        Reflector<DummyComponent> reflector = mockReflector(DummyComponent.class);

        boolean actual = newResolver(reflector).supportsParameter(dummySubcomponentParameter());

        assertThat(actual, is(true));
    }

    @Test
    public void supportsParameterWithDifferentComponentTypeReturnsFalse() throws NoSuchMethodException {
        Reflector<DummyComponent> reflector = mockReflector(DummyComponent.class);

        boolean actual = newResolver(reflector).supportsParameter(voidParameter());

        assertThat(actual, is(false));
    }

    @Test
    public void resolveArgumentReturnsComponent() throws Exception {
        Reflector<DummyComponent> reflector = mockReflector(DummyComponent.class);

        Object actual = newResolver(reflector).resolveArgument(dummyComponentParameter(),
                new ModelAndViewContainer(), mock(NativeWebRequest.class), mock(WebDataBinderFactory.class));

        assertThat(actual, is(instanceOf(DummyComponent.class)));
    }

    @Test
    public void resolveArgumentAbsorbsState() throws Exception {
        Reflector<DummyComponent> reflector = mockReflector(DummyComponent.class);
        MockHttpServletRequest request = new MockHttpServletRequest();
        request.addParameter("x", "y");

        newResolver(reflector).resolveArgument(dummyComponentParameter(), new ModelAndViewContainer(),
                new ServletWebRequest(request), mock(WebDataBinderFactory.class));

        verify(reflector).absorb(any(DummyComponent.class), stateCaptor.capture());
        assertThat(stateCaptor.getValue().get("x"), arrayContaining("y"));
    }

    // ----------------------------------------------------------------------------------------------------------------
    // private methods
    // ----------------------------------------------------------------------------------------------------------------

    private static <T> Reflector<T> mockReflector(Class<T> componentType) {
        Reflector<T> reflector = mock(Reflector.class);
        when(reflector.getComponentType()).thenReturn(componentType);
        return reflector;
    }

    private static <T> SymmetryMethodArgumentResolver<T> newResolver(Reflector<T> reflector) {
        return new SymmetryMethodArgumentResolver<>(reflector);
    }

    private MethodParameter dummyComponentParameter() throws NoSuchMethodException {
        return new MethodParameter(getDummyMethod(), 0);
    }

    private MethodParameter dummySubcomponentParameter() throws NoSuchMethodException {
        return new MethodParameter(getDummyMethod(), 1);
    }

    private MethodParameter voidParameter() throws NoSuchMethodException {
        return new MethodParameter(getDummyMethod(), 2);
    }

    private Method getDummyMethod() throws NoSuchMethodException {
        return getClass().getDeclaredMethod("dummyMethod", DummyComponent.class, DummySubcomponent.class,
                Void.class);
    }

    @SuppressWarnings("unused")
    private static void dummyMethod(DummyComponent component, DummySubcomponent subcomponent, Void voidArg) {
        // dummy method to construct MethodParameters
    }
}