Merge pull request #18750 from dvohra09/master

BAEL-9416 Get Property Value by Property Name in Java

Author: xaeldung

libraries-apache-commons/src/test/java/com/baeldung/commons/beanutils/CourseServiceUnitTest.java

@@ -2,16 +2,64 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.assertEquals;
-
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import org.junit.jupiter.api.BeforeEach;
+import org.apache.commons.beanutils.PropertyUtils;
 import java.lang.reflect.InvocationTargetException;
 import java.util.Arrays;
 import java.util.List;
-
+ 
 import org.junit.Assert;
 import org.junit.Test;
 
 public class CourseServiceUnitTest {
 
+	private static final String STUDENT_ID = "01";
+
+    @Test
+    public void givenCourse_whenGettingSimplePropertyValueUsingPropertyUtil_thenValueReturned() throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
+        Course course = new Course();
+        String name = "Computer Science";
+        List<String> codes = Arrays.asList("CS101","CS102");
+        CourseService.setValues(course, name, codes);
+
+		// Use getSimpleProperty to retrieve the 'name' property from the course bean
+        String courseName = (String) PropertyUtils.getSimpleProperty(course, "name");
+
+        assertEquals("Computer Science", courseName);
+    }
+
+    @Test
+    public void givenCourse_whenGettingIndexedPropertyValueUsingPropertyUtil_thenValueReturned() throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
+        Course course = new Course();
+        String name = "Computer Science";
+        List<String> codes = Arrays.asList("CS101","CS102");
+        CourseService.setValues(course, name, codes);
+		// Use getIndexedProperty to retrieve the element at index 1 from the 'codes' list
+        String secondCode = (String) PropertyUtils.getIndexedProperty(course, "codes[1]");
+		
+        assertEquals("CS102", secondCode);
+    }
+
+    @Test
+    public void givenCourse_whenGettingMappedPropertyValueUsingPropertyUtil_thenValueReturned() throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
+        Course course = new Course();
+        String name = "Computer Science";
+        List<String> codes = Arrays.asList("CS101","CS102");
+        CourseService.setValues(course, name, codes);
+
+		// 1. Create and set a Student
+        Student student = new Student();
+        student.setName("John Doe");
+		CourseService.setMappedValue(course, STUDENT_ID, student);
+		// Use getMappedProperty to retrieve the value associated with the key '01'
+        // from the 'enrolledStudent' map
+        Student enrolledStudent = (Student) PropertyUtils.getMappedProperty(course, "enrolledStudent(" + STUDENT_ID + ")");
+    
+        assertEquals("John Doe", enrolledStudent.getName());
+    }
+
     @Test
     public void givenCourse_whenSetValuesUsingPropertyUtil_thenReturnSetValues() throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
         Course course = new Course();
@@ -48,7 +96,7 @@ public void givenCopyProperties_whenCopyCourseToCourseEntity_thenCopyPropertyWit
 
         CourseService.copyProperties(course, courseEntity);
         Assert.assertNotNull(course.getName());
-	Assert.assertNotNull(courseEntity.getName());
+	    Assert.assertNotNull(courseEntity.getName());
         Assert.assertEquals(course.getName(), courseEntity.getName());
         Assert.assertEquals(course.getCodes(), courseEntity.getCodes());
         Assert.assertNull(courseEntity.getStudent("ST-1"));