Apex Petstore sample client errors

Description

2 generated client classes (SwagPetApiTest, SwagStoreApiTest) are not compilable due to syntax errors.

Swagger-codegen version

2.2.3

Swagger declaration file content or url

http://petstore.swagger.io/v2/swagger.json

Command line used for generation

java -jar swagger-codegen-cli.jar generate -i http://petstore.swagger.io/v2/swagger.json -l apex

Steps to reproduce

Attempt to deploy SwagPetApiTest, SwagStoreApiTest to a Salesforce org.
Deployment errors as follows (Eclipse Force.com IDE):

Description Resource Path Location Type
Save error: Expression cannot be a statement. SwagPetApiTest.cls src/classes line 139 Force.com save problem
Save error: Expression cannot be a statement. SwagStoreApiTest.cls src/classes line 46 Force.com save problem
Save error: unexpected syntax: 'missing RPAREN at ';'' SwagPetApiTest.cls src/classes line 139 Force.com save problem
Save error: unexpected syntax: 'missing RPAREN at ';'' SwagStoreApiTest.cls src/classes line 46 Force.com save problem

Related issues/PRs

None identified

Suggest a fix/enhancement

Erroring lines in the two classes are the same:
((Swagger.ApiKeyAuth) client.getAuthentication('api_key');

Fixed the client manually by changing the lines to:
client.getAuthentication('api_key');

Run the documented Java generation command against the Petstore Swagger URL and inspect SwagPetApiTest and SwagStoreApiTest, especially the reported lines. Done means both generated classes deploy to a Salesforce org without the syntax errors and no longer contain the invalid expression shown in the report.