[rust] Fix generation for optional and nullable fields (double option pattern) (#13177)

* Fix generation for optional and nullable fields (double option pattern)

* Only import serde_with if necessary

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustClientCodegen.java

@@ -450,6 +450,7 @@ public class RustClientCodegen extends AbstractRustCodegen implements CodegenCon
         String schemaType = super.getSchemaType(p);
         String type = typeMapping.getOrDefault(schemaType, schemaType);
 
+        // Implement integer type fitting (when property is enabled)
         if (Objects.equals(p.getType(), "integer")) {
             boolean bestFit = convertPropertyToBoolean(BEST_FIT_INT);
             boolean preferUnsigned = convertPropertyToBoolean(PREFER_UNSIGNED_INT);
@@ -483,6 +484,18 @@ public class RustClientCodegen extends AbstractRustCodegen implements CodegenCon
         return type;
     }
 
+    @Override
+    public void postProcessModelProperty(CodegenModel model, CodegenProperty property) {
+        super.postProcessModelProperty(model, property);
+
+        // If a property is both nullable and non-required then we represent this using a double Option
+        // which requires the `serde_with` extension crate for deserialization.
+        // See: https://docs.rs/serde_with/latest/serde_with/rust/double_option/index.html
+        if (property.isNullable && !property.required) {
+            additionalProperties.put("serdeWith", true);
+        }
+    }
+
     @Override
     public OperationsMap postProcessOperationsWithModels(OperationsMap objs, List<ModelMap> allModels) {
         OperationMap objectMap = objs.getOperations();

modules/openapi-generator/src/main/resources/rust/Cargo.mustache

@@ -7,6 +7,9 @@ edition = "2018"
 [dependencies]
 serde = "^1.0"
 serde_derive = "^1.0"
+{{#serdeWith}}
+serde_with = "^2.0"
+{{/serdeWith}}
 serde_json = "^1.0"
 url = "^2.2"
 uuid = { version = "^1.0", features = ["serde"] }

modules/openapi-generator/src/main/resources/rust/model.mustache

@@ -70,8 +70,8 @@ pub struct {{{classname}}} {
     {{#description}}
     /// {{{.}}}
     {{/description}}
-    #[serde(rename = "{{{baseName}}}"{{^required}}, skip_serializing_if = "Option::is_none"{{/required}})]
+    #[serde(rename = "{{{baseName}}}"{{^required}}{{#isNullable}}, default, with = "::serde_with::rust::double_option"{{/isNullable}}{{/required}}{{^required}}, skip_serializing_if = "Option::is_none"{{/required}}{{#required}}{{#isNullable}}, deserialize_with = "Option::deserialize"{{/isNullable}}{{/required}})]
-    pub {{{name}}}: {{#required}}{{#isNullable}}Option<{{/isNullable}}{{/required}}{{^required}}Option<{{/required}}{{#isEnum}}{{#isArray}}{{#uniqueItems}}std::collections::HashSet<{{/uniqueItems}}{{^uniqueItems}}Vec<{{/uniqueItems}}{{/isArray}}{{{enumName}}}{{#isArray}}>{{/isArray}}{{/isEnum}}{{^isEnum}}{{#isModel}}Box<{{{dataType}}}>{{/isModel}}{{^isModel}}{{{dataType}}}{{/isModel}}{{/isEnum}}{{#required}}{{#isNullable}}>{{/isNullable}}{{/required}}{{^required}}>{{/required}},
+    pub {{{name}}}: {{#isNullable}}Option<{{/isNullable}}{{^required}}Option<{{/required}}{{#isEnum}}{{#isArray}}{{#uniqueItems}}std::collections::HashSet<{{/uniqueItems}}{{^uniqueItems}}Vec<{{/uniqueItems}}{{/isArray}}{{{enumName}}}{{#isArray}}>{{/isArray}}{{/isEnum}}{{^isEnum}}{{#isModel}}Box<{{{dataType}}}>{{/isModel}}{{^isModel}}{{{dataType}}}{{/isModel}}{{/isEnum}}{{#isNullable}}>{{/isNullable}}{{^required}}>{{/required}},
 {{/vars}}
 }
 

modules/openapi-generator/src/test/resources/3_0/rust/petstore.yaml

@@ -859,3 +859,22 @@ components:
           type: boolean
         super:
           type: boolean
+    OptionalTesting:
+      description: Test handling of optional and nullable fields
+      type: object
+      required:
+        - required_nonnull
+        - required_nullable
+      properties:
+        optional_nonnull:
+          type: string
+          nullable: false
+        required_nonnull:
+          type: string
+          nullable: false
+        optional_nullable:
+          type: string
+          nullable: true
+        required_nullable:
+          type: string
+          nullable: true

samples/client/petstore/rust/hyper/petstore/.openapi-generator/FILES

@@ -7,6 +7,7 @@ docs/ApiResponse.md
 docs/Baz.md
 docs/Category.md
 docs/FakeApi.md
+docs/OptionalTesting.md
 docs/Order.md
 docs/Pet.md
 docs/PetApi.md
@@ -35,6 +36,7 @@ src/models/baz.rs
 src/models/category.rs
 src/models/mod.rs
 src/models/model_return.rs
+src/models/optional_testing.rs
 src/models/order.rs
 src/models/pet.rs
 src/models/property_test.rs

samples/client/petstore/rust/hyper/petstore/Cargo.toml

@@ -7,6 +7,7 @@ edition = "2018"
 [dependencies]
 serde = "^1.0"
 serde_derive = "^1.0"
+serde_with = "^2.0"
 serde_json = "^1.0"
 url = "^2.2"
 uuid = { version = "^1.0", features = ["serde"] }

samples/client/petstore/rust/hyper/petstore/README.md

@@ -56,6 +56,7 @@ Class | Method | HTTP request | Description
  - [ApiResponse](docs/ApiResponse.md)
  - [Baz](docs/Baz.md)
  - [Category](docs/Category.md)
+ - [OptionalTesting](docs/OptionalTesting.md)
  - [Order](docs/Order.md)
  - [Pet](docs/Pet.md)
  - [PropertyTest](docs/PropertyTest.md)

samples/client/petstore/rust/hyper/petstore/docs/OptionalTesting.md

@@ -0,0 +1,14 @@
+# OptionalTesting
+
+## Properties
+
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**optional_nonnull** | Option<**String**> |  | [optional]
+**required_nonnull** | **String** |  | 
+**optional_nullable** | Option<**String**> |  | [optional]
+**required_nullable** | Option<**String**> |  | 
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+

samples/client/petstore/rust/hyper/petstore/src/models/mod.rs

@@ -6,6 +6,8 @@ pub mod baz;
 pub use self::baz::Baz;
 pub mod category;
 pub use self::category::Category;
+pub mod optional_testing;
+pub use self::optional_testing::OptionalTesting;
 pub mod order;
 pub use self::order::Order;
 pub mod pet;

samples/client/petstore/rust/hyper/petstore/src/models/optional_testing.rs

@@ -0,0 +1,39 @@
+/*
+ * OpenAPI Petstore
+ *
+ * This is a sample server Petstore server. For this sample, you can use the api key `special-key` to test the authorization filters.
+ *
+ * The version of the OpenAPI document: 1.0.0
+ * 
+ * Generated by: https://openapi-generator.tech
+ */
+
+/// OptionalTesting : Test handling of optional and nullable fields
+
+
+
+#[derive(Clone, Debug, PartialEq, Default, Serialize, Deserialize)]
+pub struct OptionalTesting {
+    #[serde(rename = "optional_nonnull", skip_serializing_if = "Option::is_none")]
+    pub optional_nonnull: Option<String>,
+    #[serde(rename = "required_nonnull")]
+    pub required_nonnull: String,
+    #[serde(rename = "optional_nullable", default, with = "::serde_with::rust::double_option", skip_serializing_if = "Option::is_none")]
+    pub optional_nullable: Option<Option<String>>,
+    #[serde(rename = "required_nullable", deserialize_with = "Option::deserialize")]
+    pub required_nullable: Option<String>,
+}
+
+impl OptionalTesting {
+    /// Test handling of optional and nullable fields
+    pub fn new(required_nonnull: String, required_nullable: Option<String>) -> OptionalTesting {
+        OptionalTesting {
+            optional_nonnull: None,
+            required_nonnull,
+            optional_nullable: None,
+            required_nullable,
+        }
+    }
+}
+
+

samples/client/petstore/rust/reqwest/petstore-async/.openapi-generator/FILES

@@ -7,6 +7,7 @@ docs/ApiResponse.md
 docs/Baz.md
 docs/Category.md
 docs/FakeApi.md
+docs/OptionalTesting.md
 docs/Order.md
 docs/Pet.md
 docs/PetApi.md
@@ -33,6 +34,7 @@ src/models/baz.rs
 src/models/category.rs
 src/models/mod.rs
 src/models/model_return.rs
+src/models/optional_testing.rs
 src/models/order.rs
 src/models/pet.rs
 src/models/property_test.rs

samples/client/petstore/rust/reqwest/petstore-async/Cargo.toml

@@ -7,6 +7,7 @@ edition = "2018"
 [dependencies]
 serde = "^1.0"
 serde_derive = "^1.0"
+serde_with = "^2.0"
 serde_json = "^1.0"
 url = "^2.2"
 uuid = { version = "^1.0", features = ["serde"] }

samples/client/petstore/rust/reqwest/petstore-async/README.md

@@ -56,6 +56,7 @@ Class | Method | HTTP request | Description
  - [ApiResponse](docs/ApiResponse.md)
  - [Baz](docs/Baz.md)
  - [Category](docs/Category.md)
+ - [OptionalTesting](docs/OptionalTesting.md)
  - [Order](docs/Order.md)
  - [Pet](docs/Pet.md)
  - [PropertyTest](docs/PropertyTest.md)

samples/client/petstore/rust/reqwest/petstore-async/docs/OptionalTesting.md

@@ -0,0 +1,14 @@
+# OptionalTesting
+
+## Properties
+
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**optional_nonnull** | Option<**String**> |  | [optional]
+**required_nonnull** | **String** |  | 
+**optional_nullable** | Option<**String**> |  | [optional]
+**required_nullable** | Option<**String**> |  | 
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+

samples/client/petstore/rust/reqwest/petstore-async/src/models/mod.rs

@@ -6,6 +6,8 @@ pub mod baz;
 pub use self::baz::Baz;
 pub mod category;
 pub use self::category::Category;
+pub mod optional_testing;
+pub use self::optional_testing::OptionalTesting;
 pub mod order;
 pub use self::order::Order;
 pub mod pet;

samples/client/petstore/rust/reqwest/petstore-async/src/models/optional_testing.rs

@@ -0,0 +1,39 @@
+/*
+ * OpenAPI Petstore
+ *
+ * This is a sample server Petstore server. For this sample, you can use the api key `special-key` to test the authorization filters.
+ *
+ * The version of the OpenAPI document: 1.0.0
+ * 
+ * Generated by: https://openapi-generator.tech
+ */
+
+/// OptionalTesting : Test handling of optional and nullable fields
+
+
+
+#[derive(Clone, Debug, PartialEq, Default, Serialize, Deserialize)]
+pub struct OptionalTesting {
+    #[serde(rename = "optional_nonnull", skip_serializing_if = "Option::is_none")]
+    pub optional_nonnull: Option<String>,
+    #[serde(rename = "required_nonnull")]
+    pub required_nonnull: String,
+    #[serde(rename = "optional_nullable", default, with = "::serde_with::rust::double_option", skip_serializing_if = "Option::is_none")]
+    pub optional_nullable: Option<Option<String>>,
+    #[serde(rename = "required_nullable", deserialize_with = "Option::deserialize")]
+    pub required_nullable: Option<String>,
+}
+
+impl OptionalTesting {
+    /// Test handling of optional and nullable fields
+    pub fn new(required_nonnull: String, required_nullable: Option<String>) -> OptionalTesting {
+        OptionalTesting {
+            optional_nonnull: None,
+            required_nonnull,
+            optional_nullable: None,
+            required_nullable,
+        }
+    }
+}
+
+

samples/client/petstore/rust/reqwest/petstore-async/tests/pet_tests.rs

@@ -3,7 +3,7 @@ extern crate petstore_reqwest_async;
 //use petstore_reqwest_async::apis::PetApiClient;
 use petstore_reqwest_async::apis::configuration;
 //use petstore_reqwest::apis::PetApiUpdatePetWithFormParams;
-use petstore_reqwest_async::models::{Pet};
+use petstore_reqwest_async::models::Pet;
 use std::option::Option;
 
 #[test]
@@ -16,16 +16,12 @@ fn test_pet() {
     let mut new_pet = Pet::new("Rust Pet".to_string(), photo_urls);
     new_pet.id = Option::Some(8787);
 
-    let new_pet_params = petstore_reqwest_async::apis::pet_api::AddPetParams {
+    let new_pet_params = petstore_reqwest_async::apis::pet_api::AddPetParams { pet: new_pet };
-        pet: new_pet,
-    };
 
     // add pet
     let _add_result = petstore_reqwest_async::apis::pet_api::add_pet(&config, new_pet_params);
 
-    let get_pet_params = petstore_reqwest_async::apis::pet_api::GetPetByIdParams {
+    let get_pet_params = petstore_reqwest_async::apis::pet_api::GetPetByIdParams { pet_id: 8787 };
-        pet_id: 8787,
-    };
 
     // get pet
     let _pet_result = petstore_reqwest_async::apis::pet_api::get_pet_by_id(&config, get_pet_params);

samples/client/petstore/rust/reqwest/petstore-awsv4signature/.openapi-generator/FILES

@@ -7,6 +7,7 @@ docs/ApiResponse.md
 docs/Baz.md
 docs/Category.md
 docs/FakeApi.md
+docs/OptionalTesting.md
 docs/Order.md
 docs/Pet.md
 docs/PetApi.md
@@ -33,6 +34,7 @@ src/models/baz.rs
 src/models/category.rs
 src/models/mod.rs
 src/models/model_return.rs
+src/models/optional_testing.rs
 src/models/order.rs
 src/models/pet.rs
 src/models/property_test.rs

samples/client/petstore/rust/reqwest/petstore-awsv4signature/Cargo.toml

@@ -7,6 +7,7 @@ edition = "2018"
 [dependencies]
 serde = "^1.0"
 serde_derive = "^1.0"
+serde_with = "^2.0"
 serde_json = "^1.0"
 url = "^2.2"
 uuid = { version = "^1.0", features = ["serde"] }

samples/client/petstore/rust/reqwest/petstore-awsv4signature/README.md

@@ -56,6 +56,7 @@ Class | Method | HTTP request | Description
  - [ApiResponse](docs/ApiResponse.md)
  - [Baz](docs/Baz.md)
  - [Category](docs/Category.md)
+ - [OptionalTesting](docs/OptionalTesting.md)
  - [Order](docs/Order.md)
  - [Pet](docs/Pet.md)
  - [PropertyTest](docs/PropertyTest.md)

samples/client/petstore/rust/reqwest/petstore-awsv4signature/docs/OptionalTesting.md

@@ -0,0 +1,14 @@
+# OptionalTesting
+
+## Properties
+
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**optional_nonnull** | Option<**String**> |  | [optional]
+**required_nonnull** | **String** |  | 
+**optional_nullable** | Option<**String**> |  | [optional]
+**required_nullable** | Option<**String**> |  | 
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+

samples/client/petstore/rust/reqwest/petstore-awsv4signature/src/models/mod.rs

@@ -6,6 +6,8 @@ pub mod baz;
 pub use self::baz::Baz;
 pub mod category;
 pub use self::category::Category;
+pub mod optional_testing;
+pub use self::optional_testing::OptionalTesting;
 pub mod order;
 pub use self::order::Order;
 pub mod pet;

samples/client/petstore/rust/reqwest/petstore-awsv4signature/src/models/optional_testing.rs

@@ -0,0 +1,39 @@
+/*
+ * OpenAPI Petstore
+ *
+ * This is a sample server Petstore server. For this sample, you can use the api key `special-key` to test the authorization filters.
+ *
+ * The version of the OpenAPI document: 1.0.0
+ * 
+ * Generated by: https://openapi-generator.tech
+ */
+
+/// OptionalTesting : Test handling of optional and nullable fields
+
+
+
+#[derive(Clone, Debug, PartialEq, Default, Serialize, Deserialize)]
+pub struct OptionalTesting {
+    #[serde(rename = "optional_nonnull", skip_serializing_if = "Option::is_none")]
+    pub optional_nonnull: Option<String>,
+    #[serde(rename = "required_nonnull")]
+    pub required_nonnull: String,
+    #[serde(rename = "optional_nullable", default, with = "::serde_with::rust::double_option", skip_serializing_if = "Option::is_none")]
+    pub optional_nullable: Option<Option<String>>,
+    #[serde(rename = "required_nullable", deserialize_with = "Option::deserialize")]
+    pub required_nullable: Option<String>,
+}
+
+impl OptionalTesting {
+    /// Test handling of optional and nullable fields
+    pub fn new(required_nonnull: String, required_nullable: Option<String>) -> OptionalTesting {
+        OptionalTesting {
+            optional_nonnull: None,
+            required_nonnull,
+            optional_nullable: None,
+            required_nullable,
+        }
+    }
+}
+
+

samples/client/petstore/rust/reqwest/petstore/.openapi-generator/FILES

@@ -7,6 +7,7 @@ docs/ApiResponse.md
 docs/Baz.md
 docs/Category.md
 docs/FakeApi.md
+docs/OptionalTesting.md
 docs/Order.md
 docs/Pet.md
 docs/PetApi.md
@@ -33,6 +34,7 @@ src/models/baz.rs
 src/models/category.rs
 src/models/mod.rs
 src/models/model_return.rs
+src/models/optional_testing.rs
 src/models/order.rs
 src/models/pet.rs
 src/models/property_test.rs

samples/client/petstore/rust/reqwest/petstore/Cargo.toml

@@ -7,6 +7,7 @@ edition = "2018"
 [dependencies]
 serde = "^1.0"
 serde_derive = "^1.0"
+serde_with = "^2.0"
 serde_json = "^1.0"
 url = "^2.2"
 uuid = { version = "^1.0", features = ["serde"] }

samples/client/petstore/rust/reqwest/petstore/README.md

@@ -56,6 +56,7 @@ Class | Method | HTTP request | Description
  - [ApiResponse](docs/ApiResponse.md)
  - [Baz](docs/Baz.md)
  - [Category](docs/Category.md)
+ - [OptionalTesting](docs/OptionalTesting.md)
  - [Order](docs/Order.md)
  - [Pet](docs/Pet.md)
  - [PropertyTest](docs/PropertyTest.md)

samples/client/petstore/rust/reqwest/petstore/docs/OptionalTesting.md

@@ -0,0 +1,14 @@
+# OptionalTesting
+
+## Properties
+
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**optional_nonnull** | Option<**String**> |  | [optional]
+**required_nonnull** | **String** |  | 
+**optional_nullable** | Option<**String**> |  | [optional]
+**required_nullable** | Option<**String**> |  | 
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+

samples/client/petstore/rust/reqwest/petstore/src/models/mod.rs

@@ -6,6 +6,8 @@ pub mod baz;
 pub use self::baz::Baz;
 pub mod category;
 pub use self::category::Category;
+pub mod optional_testing;
+pub use self::optional_testing::OptionalTesting;
 pub mod order;
 pub use self::order::Order;
 pub mod pet;

samples/client/petstore/rust/reqwest/petstore/src/models/optional_testing.rs

@@ -0,0 +1,39 @@
+/*
+ * OpenAPI Petstore
+ *
+ * This is a sample server Petstore server. For this sample, you can use the api key `special-key` to test the authorization filters.
+ *
+ * The version of the OpenAPI document: 1.0.0
+ * 
+ * Generated by: https://openapi-generator.tech
+ */
+
+/// OptionalTesting : Test handling of optional and nullable fields
+
+
+
+#[derive(Clone, Debug, PartialEq, Default, Serialize, Deserialize)]
+pub struct OptionalTesting {
+    #[serde(rename = "optional_nonnull", skip_serializing_if = "Option::is_none")]
+    pub optional_nonnull: Option<String>,
+    #[serde(rename = "required_nonnull")]
+    pub required_nonnull: String,
+    #[serde(rename = "optional_nullable", default, with = "::serde_with::rust::double_option", skip_serializing_if = "Option::is_none")]
+    pub optional_nullable: Option<Option<String>>,
+    #[serde(rename = "required_nullable", deserialize_with = "Option::deserialize")]
+    pub required_nullable: Option<String>,
+}
+
+impl OptionalTesting {
+    /// Test handling of optional and nullable fields
+    pub fn new(required_nonnull: String, required_nullable: Option<String>) -> OptionalTesting {
+        OptionalTesting {
+            optional_nonnull: None,
+            required_nonnull,
+            optional_nullable: None,
+            required_nullable,
+        }
+    }
+}
+
+

samples/client/petstore/rust/reqwest/petstore/tests/optional_tests.rs

@@ -0,0 +1,58 @@
+extern crate petstore_reqwest;
+
+use petstore_reqwest::models::OptionalTesting;
+
+#[test]
+fn test_serialization() {
+    let mut test = OptionalTesting {
+        optional_nonnull: None,
+        required_nonnull: "".to_string(),
+        optional_nullable: None,
+        required_nullable: None,
+    };
+    // Only the required fields should show up in JSON
+    assert_eq!(
+        serde_json::to_string(&test).unwrap(),
+        "{\"required_nonnull\":\"\",\"required_nullable\":null}"
+    );
+    // Setting the outer of `optional_nullable` it should be serialized as null
+    test.optional_nullable = Some(None);
+    assert_eq!(
+        serde_json::to_string(&test).unwrap(),
+        "{\"required_nonnull\":\"\",\"optional_nullable\":null,\"required_nullable\":null}"
+    );
+}
+
+#[test]
+fn test_deserialization() {
+    // `required_nullable` is missing so should fail to deserialize
+    let input = "{\"required_nonnull\": \"\"}";
+    assert!(serde_json::from_str::<OptionalTesting>(&input).is_err());
+
+    // After adding `required_nullable` it should deserialize
+    // `optional_nullable` should be None because it is not present
+    let input = "{\"required_nonnull\": \"\", \"required_nullable\": null}";
+    let out = serde_json::from_str::<OptionalTesting>(&input).unwrap();
+    assert!(out.required_nullable.is_none());
+    assert!(out.optional_nullable.is_none());
+
+    // Setting `optional_nullable` to null should be Some(None)
+    let input =
+        "{\"required_nonnull\": \"\", \"required_nullable\": null, \"optional_nullable\": null}";
+    assert!(matches!(
+        serde_json::from_str::<OptionalTesting>(&input)
+            .unwrap()
+            .optional_nullable,
+        Some(None)
+    ));
+
+    // Setting `optional_nullable` to a value
+    let input =
+        "{\"required_nonnull\": \"\", \"required_nullable\": null, \"optional_nullable\": \"abc\"}";
+    assert!(matches!(
+        serde_json::from_str::<OptionalTesting>(&input)
+            .unwrap()
+            .optional_nullable,
+        Some(Some(_))
+    ));
+}

samples/client/petstore/rust/reqwest/petstore/tests/pet_tests.rs

@@ -1,8 +1,8 @@
 extern crate petstore_reqwest;
 
-use petstore_reqwest::apis::pet_api::{add_pet, get_pet_by_id};
 use petstore_reqwest::apis::configuration;
-use petstore_reqwest::models::{Pet};
+use petstore_reqwest::apis::pet_api::{add_pet, get_pet_by_id};
+use petstore_reqwest::models::Pet;
 
 #[test]
 fn test_pet() {
@@ -24,7 +24,10 @@ fn test_pet() {
             /* Test code when multiple returns option is not set. */
             assert_eq!(resp.id, Option::Some(8787));
             assert_eq!(resp.name, "Rust Pet");
-            assert_eq!(resp.photo_urls, vec!["https://11".to_string(), "https://22".to_string()]);
+            assert_eq!(
+                resp.photo_urls,
+                vec!["https://11".to_string(), "https://22".to_string()]
+            );
             /* Test code for multiple returns option.
             match resp.entity {
                 Some(petstore_reqwest::apis::pet_api::GetPetByIdSuccess::Status200(pet)) => {
@@ -37,10 +40,10 @@ fn test_pet() {
                 },
             };
             */
-        },
+        }
         Err(error) => {
             println!("error: {:?}", error);
             panic!("Query should succeed");
-        },
+        }
     };
 }