fix: do not remove shared required properties in allOf selection (#524)

* fix: do not remove shared required properties

* test: add test

src/core/run.js

@@ -169,7 +169,7 @@ function run(refs, schema, container) {
             if (sub.oneOf) {
               mix.forEach(omit => {
                 if (omit !== fixed && omit.required) {
-                  omit.required.forEach(key => {
+                  omit.required.filter(required => !fixed.required.includes(required)).forEach(function (key) {
                     delete copy.properties[key];
                   });
                 }

tests/schema/core/required/do-not-delete-shared-props.json

+[
+  {
+    "description": "when allOf is provided and all the schemas are sharing some required properties",
+    "tests": [
+      {
+        "description": "should not remove the shared properties",
+        "schema": {
+          "type": "object",
+          "oneOf": [
+            {
+              "$ref": "#/components/A"
+            },
+            {
+              "$ref": "#/components/B"
+            }
+          ],
+          "components": {
+            "A": {
+              "required": [
+                "name",
+                "resourceType"
+              ],
+              "type": "object",
+              "properties": {
+                "resourceType": {
+                  "type": "string"
+                },
+                "name": {
+                  "type": "string"
+                },
+                "color": {
+                  "type": "string"
+                },
+                "length": {
+                  "type": "integer"
+                }
+              }
+            },
+            "B": {
+              "required": [
+                "name",
+                "resourceType"
+              ],
+              "type": "object",
+              "properties": {
+                "resourceType": {
+                  "type": "string"
+                },
+                "name": {
+                  "type": "string"
+                },
+                "description": {
+                  "type": "string"
+                },
+                "age": {
+                  "type": "integer"
+                }
+              }
+            }
+          }
+        },
+        "hasProps": [
+          "name",
+          "resourceType"
+        ]
+      }
+    ]
+  }
+]