717 issue fix (#718)

* Improve change detection to consider changeDefault field in ChangedSchema

* Add test for defaults handling in Schema

* Add test for defaults handling in Schema

Author: DrSatyr

core/src/main/java/org/openapitools/openapidiff/core/model/ChangedSchema.java

@@ -136,6 +136,7 @@ private DiffResult calculateCoreChanged() {
     if (!changedType
         && (oldSchema == null && newSchema == null || oldSchema != null && newSchema != null)
         && !changeFormat
+        && !changeDefault
         && increasedProperties.isEmpty()
         && missingProperties.isEmpty()
         && changedProperties.values().isEmpty()

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

@@ -0,0 +1,26 @@
+package org.openapitools.openapidiff.core;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+import org.openapitools.openapidiff.core.model.ChangedOpenApi;
+import org.openapitools.openapidiff.core.model.ChangedSchema;
+
+public class SchemaDefaultsTest {
+
+  @Test
+  public void issue717DefaultsInSchema() {
+    ChangedOpenApi changedOpenApi =
+        OpenApiCompare.fromLocations(
+            "issue-717-schema-defaults-handling-1.yaml",
+            "issue-717-schema-defaults-handling-2.yaml");
+
+    assertEquals(1, changedOpenApi.getChangedOperations().size());
+    assertEquals(1, changedOpenApi.getChangedSchemas().size());
+    ChangedSchema changedSchema = changedOpenApi.getChangedSchemas().get(0);
+    assertEquals(1, changedSchema.getChangedProperties().size());
+    assertTrue(changedSchema.getChangedProperties().containsKey("field1"));
+    assertTrue(changedSchema.getChangedProperties().get("field1").isChangeDefault());
+  }
+}

core/src/test/resources/issue-717-schema-defaults-handling-1.yaml

@@ -0,0 +1,21 @@
+openapi: 3.1.0
+info:
+  description: Schema defaults handling
+  title: defaults
+  version: 1.0.0
+paths:
+  /defaults/property-schema/:
+    post:
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/TestDTO'
+components:
+  schemas:
+    TestDTO:
+      type: object
+      properties:
+        field1:
+          default: default value
+          type: string

core/src/test/resources/issue-717-schema-defaults-handling-2.yaml

@@ -0,0 +1,21 @@
+openapi: 3.1.0
+info:
+  description: Schema defaults handling
+  title: defaults
+  version: 1.0.0
+paths:
+  /defaults/property-schema/:
+    post:
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/TestDTO'
+components:
+  schemas:
+    TestDTO:
+      type: object
+      properties:
+        field1:
+          default: default value updated
+          type: string