add tests for deprecated enum class

Author: wing328

modules/openapi-generator/src/test/resources/3_0/java/petstore-with-fake-endpoints-models-for-testing-okhttp-gson.yaml

@@ -2075,6 +2075,7 @@ components:
         - s
         - S
     OuterEnumInteger:
+      deprecated: true
       type: integer
       enum:
       - 0
@@ -2865,4 +2866,4 @@ components:
         height:
           allOf:
             - $ref: '#/components/schemas/Height'
-          default: 32.1
+          default: 32.1

samples/client/petstore/java/okhttp-gson/api/openapi.yaml

@@ -2215,6 +2215,7 @@ components:
       nullable: true
       type: string
     OuterEnumInteger:
+      deprecated: true
       enum:
       - 0
       - 1

samples/client/petstore/java/okhttp-gson/src/main/java/org/openapitools/client/model/EnumTest.java

@@ -352,6 +352,7 @@ public static void validateJsonElement(JsonElement jsonElement) throws IOExcepti
   private OuterEnum outerEnum;
 
   public static final String SERIALIZED_NAME_OUTER_ENUM_INTEGER = "outerEnumInteger";
+  @Deprecated
   @SerializedName(SERIALIZED_NAME_OUTER_ENUM_INTEGER)
   @javax.annotation.Nullable
   private OuterEnumInteger outerEnumInteger;
@@ -483,6 +484,7 @@ public void setOuterEnum(@javax.annotation.Nullable OuterEnum outerEnum) {
   }
 
 
+  @Deprecated
   public EnumTest outerEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
     return this;
@@ -491,12 +493,15 @@ public EnumTest outerEnumInteger(@javax.annotation.Nullable OuterEnumInteger out
   /**
    * Get outerEnumInteger
    * @return outerEnumInteger
+   * @deprecated
    */
+  @Deprecated
   @javax.annotation.Nullable
   public OuterEnumInteger getOuterEnumInteger() {
     return outerEnumInteger;
   }
 
+  @Deprecated
   public void setOuterEnumInteger(@javax.annotation.Nullable OuterEnumInteger outerEnumInteger) {
     this.outerEnumInteger = outerEnumInteger;
   }

samples/client/petstore/java/okhttp-gson/src/main/java/org/openapitools/client/model/OuterEnumInteger.java

@@ -28,6 +28,7 @@
 /**
  * Gets or Sets OuterEnumInteger
  */
+@Deprecated
 @JsonAdapter(OuterEnumInteger.Adapter.class)
 public enum OuterEnumInteger {