[Spring] java.lang.reflect.Method 테스트 해보기

-- 입력받는 파라미터가 없는 메서드

import static org.junit.Assert.assertThat;
import static org.hamcrest.CoreMatchers.is;

import java.lang.reflect.Method;

import org.junit.Test;

public class ReflectTest {

    @Test
    public void testReflect() throws Exception {
        Method method = Sample.class.getMethod("getSample");
        assertThat((String) method.invoke(Sample.class.newInstance()), is("Sample"));
    }

    public static class Sample {
        public String getSample() {
            return "Sample";
        }

        public String getSample(String append) {
            return "Sample " + append;
        }
    }
}

-- 파라미터를 입력받는 메서드

import static org.junit.Assert.assertThat;
import static org.hamcrest.CoreMatchers.is;

import java.lang.reflect.Method;

import org.junit.Test;

public class ReflectTest {

    @Test
    public void testReflect() throws Exception {
        Method method = Sample.class.getMethod("getSample");
        assertThat((String) method.invoke(new Sample()), is("Sample"));
       
        method = Sample.class.getMethod("getSample", String.class);
        assertThat((String)method.invoke(new Sample(), "Test"), is("Sample Test"));
    }

    public class Sample {
        public String getSample() {
            return "Sample";
        }

        public String getSample(String append) {
            return "Sample " + append;
        }
    }
}

-- 다수의 파라미터를 받는 메서드

import static org.junit.Assert.assertThat;
import static org.hamcrest.CoreMatchers.is;

import java.lang.reflect.Method;

import org.junit.Test;

public class ReflectTest {

    @Test
    public void testReflect() throws Exception {
        Method method = Sample.class.getMethod("getSample");
        assertThat((String) method.invoke(new Sample()), is("Sample"));
       
        method = Sample.class.getMethod("getSample", String.class);
        assertThat((String)method.invoke(new Sample(), "Test"), is("Sample Test"));
       
        method = Sample.class.getMethod("getSample", String.class, int.class);
        assertThat((String)method.invoke(new Sample(), "Cut", 7), is("Cut"));
    }

    public class Sample {
        public String getSample() {
            return "Sample";
        }

        public String getSample(String append) {
            return "Sample " + append;
        }
       
        public String getSample(String append, int beginIndex){
            return getSample(append).substring(beginIndex);
        }
    }
}