fix: No change if same minItems or maxItems

Author: danilofuchs

core/src/main/java/org/openapitools/openapidiff/core/model/schema/ChangedMaxItems.java

@@ -17,6 +17,9 @@ public ChangedMaxItems(Integer oldValue, Integer newValue, DiffContext context)
 
   @Override
   public DiffResult isChanged() {
+    if (oldValue == newValue) {
+      return DiffResult.NO_CHANGES;
+    }
     if (oldValue == null && newValue == null) {
       return DiffResult.NO_CHANGES;
     }

core/src/main/java/org/openapitools/openapidiff/core/model/schema/ChangedMinItems.java

@@ -17,6 +17,9 @@ public ChangedMinItems(Integer oldValue, Integer newValue, DiffContext context)
 
   @Override
   public DiffResult isChanged() {
+    if (oldValue == newValue) {
+      return DiffResult.NO_CHANGES;
+    }
     if (oldValue == null && newValue == null) {
       return DiffResult.NO_CHANGES;
     }

core/src/test/java/org/openapitools/openapidiff/core/SchemaDiffTest.java

@@ -144,7 +144,7 @@ public void changeMultipleOfHandling() {
     assertThat(props.get("field4").getMultipleOf().getRight()).isNull();
   }
 
-  @Test // issues #480
+  @Test // issues #480 and #779
   public void changeMinMaxItemsHandling() {
     ChangedOpenApi changedOpenApi =
         OpenApiCompare.fromLocations(
@@ -158,6 +158,9 @@ public void changeMinMaxItemsHandling() {
     Map<String, ChangedSchema> props = changedSchema.getChangedProperties();
     assertThat(props).isNotEmpty();
 
+    // Check no changes in minItems and maxItems
+    assertThat(props.get("field0")).isNull();
+
     // Check increasing of minItems
     assertThat(props.get("field1").getMinItems().isIncompatible()).isTrue();
     assertThat(props.get("field1").getMinItems().getOldValue()).isEqualTo(1);

core/src/test/resources/schemaDiff/schema-min-max-items-diff-1.yaml

@@ -16,6 +16,12 @@ components:
     TestDTO:
       type: object
       properties:
+        field0:
+          type: array
+          items:
+            type: string
+          minItems: 1
+          maxItems: 10
         field1:
           type: array
           items:
@@ -33,7 +39,7 @@ components:
           items:
             type: string
           minItems: 1
-          maxItems: 90              
+          maxItems: 90
         field4:
           type: array
           items:

core/src/test/resources/schemaDiff/schema-min-max-items-diff-2.yaml

@@ -16,6 +16,12 @@ components:
     TestDTO:
       type: object
       properties:
+        field0:
+          type: array
+          items:
+            type: string
+          minItems: 1
+          maxItems: 10
         field1:
           type: array
           items:
@@ -27,13 +33,13 @@ components:
           items:
             type: string
           minItems: 10
-          maxItems: 100  
+          maxItems: 100
         field3:
           type: array
           items:
             type: string
           minItems: 1
-          maxItems: 100  
+          maxItems: 100
         field4:
           type: array
           items: