test: Use Reflection to test private mergeArrays method in MethodAttributes

Author: limehee

springdoc-openapi-starter-common/src/main/java/org/springdoc/core/models/MethodAttributes.java

@@ -305,7 +305,7 @@ private void fillMethods(String[] produces, String[] consumes, String[] headers)
 	 * @param array2 the array2
 	 * @return the string [ ]
 	 */
-    public String[] mergeArrays(@Nullable String[] array1, String[] array2) {
+    private String[] mergeArrays(@Nullable String[] array1, String[] array2) {
 		Set<String> uniqueValues = array1 == null ? new LinkedHashSet<>() : Arrays.stream(array1).collect(Collectors.toCollection(LinkedHashSet::new));
 		uniqueValues.addAll(Arrays.asList(array2));
 		return uniqueValues.toArray(new String[0]);

springdoc-openapi-starter-common/src/test/java/org/springdoc/core/model/MethodAttributesTest.java

@@ -11,27 +11,33 @@
 public class MethodAttributesTest {
 
     @Test
-    public void testMergeArrays() {
+    public void testMergeArrays() throws Exception {
         MethodAttributes methodAttributes = new MethodAttributes("application/json", "application/xml", Locale.ENGLISH);
 
         String[] array1 = {"application/json", "application/xml"};
         String[] array2 = {"application/xml", "application/yaml"};
 
         String[] expected = {"application/json", "application/xml", "application/yaml"};
-        String[] result = methodAttributes.mergeArrays(array1, array2);
+
+        Method mergeArraysMethod = MethodAttributes.class.getDeclaredMethod("mergeArrays", String[].class, String[].class);
+        mergeArraysMethod.setAccessible(true);
+        String[] result = (String[]) mergeArraysMethod.invoke(methodAttributes, (Object) array1, (Object) array2);
 
         assertArrayEquals(expected, result);
     }
 
     @Test
-    public void testMergeArraysWithNullArray1() {
+    public void testMergeArraysWithNullArray1() throws Exception {
         MethodAttributes methodAttributes = new MethodAttributes("application/json", "application/xml", Locale.ENGLISH);
 
         String[] array1 = null;
         String[] array2 = {"application/xml", "application/yaml"};
 
         String[] expected = {"application/xml", "application/yaml"};
-        String[] result = methodAttributes.mergeArrays(array1, array2);
+
+        Method mergeArraysMethod = MethodAttributes.class.getDeclaredMethod("mergeArrays", String[].class, String[].class);
+        mergeArraysMethod.setAccessible(true);
+        String[] result = (String[]) mergeArraysMethod.invoke(methodAttributes, (Object) array1, (Object) array2);
 
         assertArrayEquals(expected, result);
     }
@@ -61,4 +67,4 @@ public void testDefaultConsumesMediaType() {
 
         assertArrayEquals(expectedConsumes, resultConsumes);
     }
-}
+}