add go echo api tests (#16570)

Author: wing328

bin/configs/go-echo-api.yaml

@@ -0,0 +1,6 @@
+generatorName: go
+outputDir: samples/client/echo_api/go
+inputSpec: modules/openapi-generator/src/test/resources/3_0/echo_api.yaml
+templateDir: modules/openapi-generator/src/main/resources/go
+additionalProperties:
+  hideGenerationTimestamp: "true"

samples/client/echo_api/go/.gitignore

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+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+*.prof

samples/client/echo_api/go/.openapi-generator-ignore

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+# OpenAPI Generator Ignore
+# Generated by openapi-generator https://github.com/openapitools/openapi-generator
+
+# Use this file to prevent files from being overwritten by the generator.
+# The patterns follow closely to .gitignore or .dockerignore.
+
+# As an example, the C# client generator defines ApiClient.cs.
+# You can make changes and tell OpenAPI Generator to ignore just this file by uncommenting the following line:
+#ApiClient.cs
+
+# You can match any string of characters against a directory, file or extension with a single asterisk (*):
+#foo/*/qux
+# The above matches foo/bar/qux and foo/baz/qux, but not foo/bar/baz/qux
+
+# You can recursively match patterns against a directory, file or extension with a double asterisk (**):
+#foo/**/qux
+# This matches foo/bar/qux, foo/baz/qux, and foo/bar/baz/qux
+
+# You can also negate patterns with an exclamation (!).
+# For example, you can ignore all files in a docs folder with the file extension .md:
+#docs/*.md
+# Then explicitly reverse the ignore rule for a single file:
+#!docs/README.md

samples/client/echo_api/go/.openapi-generator/FILES

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+.gitignore
+.travis.yml
+README.md
+api/openapi.yaml
+api_auth.go
+api_body.go
+api_form.go
+api_header.go
+api_path.go
+api_query.go
+client.go
+configuration.go
+docs/AuthAPI.md
+docs/Bird.md
+docs/BodyAPI.md
+docs/Category.md
+docs/DataQuery.md
+docs/DefaultValue.md
+docs/FormAPI.md
+docs/HeaderAPI.md
+docs/NumberPropertiesOnly.md
+docs/PathAPI.md
+docs/Pet.md
+docs/Query.md
+docs/QueryAPI.md
+docs/StringEnumRef.md
+docs/Tag.md
+docs/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.md
+docs/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.md
+git_push.sh
+go.mod
+go.sum
+model_bird.go
+model_category.go
+model_data_query.go
+model_default_value.go
+model_number_properties_only.go
+model_pet.go
+model_query.go
+model_string_enum_ref.go
+model_tag.go
+model_test_query_style_deep_object_explode_true_object_all_of_query_object_parameter.go
+model_test_query_style_form_explode_true_array_string_query_object_parameter.go
+response.go
+utils.go

samples/client/echo_api/go/.openapi-generator/VERSION

@@ -0,0 +1 @@
+7.0.1-SNAPSHOT

samples/client/echo_api/go/.travis.yml

@@ -0,0 +1,8 @@
+language: go
+
+install:
+  - go get -d -v .
+
+script:
+  - go build -v ./
+

samples/client/echo_api/go/README.md

@@ -0,0 +1,155 @@
+# Go API client for openapi
+
+Echo Server API
+
+## Overview
+This API client was generated by the [OpenAPI Generator](https://openapi-generator.tech) project.  By using the [OpenAPI-spec](https://www.openapis.org/) from a remote server, you can easily generate an API client.
+
+- API version: 0.1.0
+- Package version: 1.0.0
+- Build package: org.openapitools.codegen.languages.GoClientCodegen
+
+## Installation
+
+Install the following dependencies:
+
+```shell
+go get github.com/stretchr/testify/assert
+go get golang.org/x/net/context
+```
+
+Put the package under your project folder and add the following in import:
+
+```golang
+import openapi "github.com/GIT_USER_ID/GIT_REPO_ID"
+```
+
+To use a proxy, set the environment variable `HTTP_PROXY`:
+
+```golang
+os.Setenv("HTTP_PROXY", "http://proxy_name:proxy_port")
+```
+
+## Configuration of Server URL
+
+Default configuration comes with `Servers` field that contains server objects as defined in the OpenAPI specification.
+
+### Select Server Configuration
+
+For using other server than the one defined on index 0 set context value `sw.ContextServerIndex` of type `int`.
+
+```golang
+ctx := context.WithValue(context.Background(), openapi.ContextServerIndex, 1)
+```
+
+### Templated Server URL
+
+Templated server URL is formatted using default variables from configuration or from context value `sw.ContextServerVariables` of type `map[string]string`.
+
+```golang
+ctx := context.WithValue(context.Background(), openapi.ContextServerVariables, map[string]string{
+	"basePath": "v2",
+})
+```
+
+Note, enum values are always validated and all unused variables are silently ignored.
+
+### URLs Configuration per Operation
+
+Each operation can use different server URL defined using `OperationServers` map in the `Configuration`.
+An operation is uniquely identified by `"{classname}Service.{nickname}"` string.
+Similar rules for overriding default operation server index and variables applies by using `sw.ContextOperationServerIndices` and `sw.ContextOperationServerVariables` context maps.
+
+```golang
+ctx := context.WithValue(context.Background(), openapi.ContextOperationServerIndices, map[string]int{
+	"{classname}Service.{nickname}": 2,
+})
+ctx = context.WithValue(context.Background(), openapi.ContextOperationServerVariables, map[string]map[string]string{
+	"{classname}Service.{nickname}": {
+		"port": "8443",
+	},
+})
+```
+
+## Documentation for API Endpoints
+
+All URIs are relative to *http://localhost:3000*
+
+Class | Method | HTTP request | Description
+------------ | ------------- | ------------- | -------------
+*AuthAPI* | [**TestAuthHttpBasic**](docs/AuthAPI.md#testauthhttpbasic) | **Post** /auth/http/basic | To test HTTP basic authentication
+*BodyAPI* | [**TestBinaryGif**](docs/BodyAPI.md#testbinarygif) | **Post** /binary/gif | Test binary (gif) response body
+*BodyAPI* | [**TestBodyApplicationOctetstreamBinary**](docs/BodyAPI.md#testbodyapplicationoctetstreambinary) | **Post** /body/application/octetstream/binary | Test body parameter(s)
+*BodyAPI* | [**TestBodyMultipartFormdataArrayOfBinary**](docs/BodyAPI.md#testbodymultipartformdataarrayofbinary) | **Post** /body/application/octetstream/array_of_binary | Test array of binary in multipart mime
+*BodyAPI* | [**TestEchoBodyFreeFormObjectResponseString**](docs/BodyAPI.md#testechobodyfreeformobjectresponsestring) | **Post** /echo/body/FreeFormObject/response_string | Test free form object
+*BodyAPI* | [**TestEchoBodyPet**](docs/BodyAPI.md#testechobodypet) | **Post** /echo/body/Pet | Test body parameter(s)
+*BodyAPI* | [**TestEchoBodyPetResponseString**](docs/BodyAPI.md#testechobodypetresponsestring) | **Post** /echo/body/Pet/response_string | Test empty response body
+*BodyAPI* | [**TestEchoBodyTagResponseString**](docs/BodyAPI.md#testechobodytagresponsestring) | **Post** /echo/body/Tag/response_string | Test empty json (request body)
+*FormAPI* | [**TestFormIntegerBooleanString**](docs/FormAPI.md#testformintegerbooleanstring) | **Post** /form/integer/boolean/string | Test form parameter(s)
+*FormAPI* | [**TestFormOneof**](docs/FormAPI.md#testformoneof) | **Post** /form/oneof | Test form parameter(s) for oneOf schema
+*HeaderAPI* | [**TestHeaderIntegerBooleanString**](docs/HeaderAPI.md#testheaderintegerbooleanstring) | **Get** /header/integer/boolean/string | Test header parameter(s)
+*PathAPI* | [**TestsPathStringPathStringIntegerPathInteger**](docs/PathAPI.md#testspathstringpathstringintegerpathinteger) | **Get** /path/string/{path_string}/integer/{path_integer} | Test path parameter(s)
+*QueryAPI* | [**TestEnumRefString**](docs/QueryAPI.md#testenumrefstring) | **Get** /query/enum_ref_string | Test query parameter(s)
+*QueryAPI* | [**TestQueryDatetimeDateString**](docs/QueryAPI.md#testquerydatetimedatestring) | **Get** /query/datetime/date/string | Test query parameter(s)
+*QueryAPI* | [**TestQueryIntegerBooleanString**](docs/QueryAPI.md#testqueryintegerbooleanstring) | **Get** /query/integer/boolean/string | Test query parameter(s)
+*QueryAPI* | [**TestQueryStyleDeepObjectExplodeTrueObject**](docs/QueryAPI.md#testquerystyledeepobjectexplodetrueobject) | **Get** /query/style_deepObject/explode_true/object | Test query parameter(s)
+*QueryAPI* | [**TestQueryStyleDeepObjectExplodeTrueObjectAllOf**](docs/QueryAPI.md#testquerystyledeepobjectexplodetrueobjectallof) | **Get** /query/style_deepObject/explode_true/object/allOf | Test query parameter(s)
+*QueryAPI* | [**TestQueryStyleFormExplodeTrueArrayString**](docs/QueryAPI.md#testquerystyleformexplodetruearraystring) | **Get** /query/style_form/explode_true/array_string | Test query parameter(s)
+*QueryAPI* | [**TestQueryStyleFormExplodeTrueObject**](docs/QueryAPI.md#testquerystyleformexplodetrueobject) | **Get** /query/style_form/explode_true/object | Test query parameter(s)
+*QueryAPI* | [**TestQueryStyleFormExplodeTrueObjectAllOf**](docs/QueryAPI.md#testquerystyleformexplodetrueobjectallof) | **Get** /query/style_form/explode_true/object/allOf | Test query parameter(s)
+
+
+## Documentation For Models
+
+ - [Bird](docs/Bird.md)
+ - [Category](docs/Category.md)
+ - [DataQuery](docs/DataQuery.md)
+ - [DefaultValue](docs/DefaultValue.md)
+ - [NumberPropertiesOnly](docs/NumberPropertiesOnly.md)
+ - [Pet](docs/Pet.md)
+ - [Query](docs/Query.md)
+ - [StringEnumRef](docs/StringEnumRef.md)
+ - [Tag](docs/Tag.md)
+ - [TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter](docs/TestQueryStyleDeepObjectExplodeTrueObjectAllOfQueryObjectParameter.md)
+ - [TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter](docs/TestQueryStyleFormExplodeTrueArrayStringQueryObjectParameter.md)
+
+
+## Documentation For Authorization
+
+
+Authentication schemes defined for the API:
+### http_auth
+
+- **Type**: HTTP basic authentication
+
+Example
+
+```golang
+auth := context.WithValue(context.Background(), sw.ContextBasicAuth, sw.BasicAuth{
+    UserName: "username",
+    Password: "password",
+})
+r, err := client.Service.Operation(auth, args)
+```
+
+
+## Documentation for Utility Methods
+
+Due to the fact that model structure members are all pointers, this package contains
+a number of utility functions to easily obtain pointers to values of basic types.
+Each of these functions takes a value of the given basic type and returns a pointer to it:
+
+* `PtrBool`
+* `PtrInt`
+* `PtrInt32`
+* `PtrInt64`
+* `PtrFloat`
+* `PtrFloat32`
+* `PtrFloat64`
+* `PtrString`
+* `PtrTime`
+
+## Author
+
+team@openapitools.org
+