[Spring](EN) Test private variable or method(function) using ReflectionTestUtils
Test private variable or method(function) using ReflectionTestUtils
Environment and Prerequisite
- Java
- Spring
ReflectionTestUtils
Target Class
@Component
@Getter
public class ReflectionTestUtilsComponent {
private int privateValue;
private int privateMethod(int a, int b) {
privateValue += a;
privateValue += b;
return privateValue;
}
}
private Variable Test
Format
static void setField(Class<?> targetClass, String name, Object value)
static void setField(Class<?> targetClass, String name, Object value, Class<?> type)
static void setField(Object targetObject, Class<?> targetClass, String name, Object value, Class<?> type)
static void setField(Object targetObject, String name, Object value)
static void setField(Object targetObject, String name, Object value, Class<?> type)
Usage Example
@Test
public void testPrivateValue() {
ReflectionTestUtils.setField(reflectionTestUtilsComponent, "privateValue", 100);
// ReflectionTestUtils.setField(target object, "variable name", target value);
Assertions.assertEquals(100, reflectionTestUtilsComponent.getPrivateValue());
}
private Method(Function) Test
Format
static <T> T invokeMethod(Class<?> targetClass, String name, Object... args)
static <T> T invokeMethod(Object targetObject, Class<?> targetClass, String name, Object... args)
static <T> T invokeMethod(Object target, String name, Object... args)
Usage Example
@Test
public void testPrivateMethod() {
ReflectionTestUtils.setField(reflectionTestUtilsComponent, "privateValue", 100);
// ReflectionTestUtils.setField(target object, "variable name", target value);
Assertions.assertEquals(103, (Integer) ReflectionTestUtils.invokeMethod(reflectionTestUtilsComponent, "privateMethod", 1, 2));
// ReflectionTestUtils.invokeMethod(target object, "method(function) name", arguments);
Assertions.assertEquals(103, reflectionTestUtilsComponent.getPrivateValue());
}