codegen_test.go

package codegen

import (
	"bytes"
	_ "embed"
	"go/format"
	"io/ioutil"
	"net/http"
	"testing"

	"github.com/stretchr/testify/require"

	"github.com/deepmap/oapi-codegen/pkg/util"

	"github.com/getkin/kin-openapi/openapi3"
	"github.com/golangci/lint-1"
	"github.com/stretchr/testify/assert"

	examplePetstoreClient "github.com/deepmap/oapi-codegen/examples/petstore-expanded"
	examplePetstore "github.com/deepmap/oapi-codegen/examples/petstore-expanded/echo/api"
)

func checkLint(t *testing.T, filename string, code []byte) {
	linter := new(lint.Linter)
	problems, err := linter.Lint("test.gen.go", code)
	assert.NoError(t, err)
	assert.Len(t, problems, 0)
}

func TestExamplePetStoreCodeGeneration(t *testing.T) {

	// Input vars for code generation:
	packageName := "api"
	opts := Configuration{
		PackageName: packageName,
		Generate: GenerateOptions{
			EchoServer:   true,
			Client:       true,
			Models:       true,
			EmbeddedSpec: true,
		},
	}

	// Get a spec from the example PetStore definition:
	swagger, err := examplePetstore.GetSwagger()
	assert.NoError(t, err)

	// Run our code generation:
	code, err := Generate(swagger, opts)
	assert.NoError(t, err)
	assert.NotEmpty(t, code)

	// Check that we have valid (formattable) code:
	_, err = format.Source([]byte(code))
	assert.NoError(t, err)

	// Check that we have a package:
	assert.Contains(t, code, "package api")

	// Check that the client method signatures return response structs:
	assert.Contains(t, code, "func (c *Client) FindPetByID(ctx context.Context, id int64, reqEditors ...RequestEditorFn) (*http.Response, error) {")

	// Check that the property comments were generated
	assert.Contains(t, code, "// Unique id of the pet")

	// Check that the summary comment contains newlines
	assert.Contains(t, code, `// Deletes a pet by ID
	// (DELETE /pets/{id})
`)

	// Make sure the generated code is valid:
	checkLint(t, "test.gen.go", []byte(code))
}

func TestExamplePetStoreCodeGenerationWithUserTemplates(t *testing.T) {

	userTemplates := map[string]string{"typedef.tmpl": "//blah"}

	// Input vars for code generation:
	packageName := "api"
	opts := Configuration{
		PackageName: packageName,
		Generate: GenerateOptions{
			Models: true,
		},
		OutputOptions: OutputOptions{
			UserTemplates: userTemplates,
		},
	}

	// Get a spec from the example PetStore definition:
	swagger, err := examplePetstore.GetSwagger()
	assert.NoError(t, err)

	// Run our code generation:
	code, err := Generate(swagger, opts)
	assert.NoError(t, err)
	assert.NotEmpty(t, code)

	// Check that we have valid (formattable) code:
	_, err = format.Source([]byte(code))
	assert.NoError(t, err)

	// Check that we have a package:
	assert.Contains(t, code, "package api")

	// Check that the built-in template has been overriden
	assert.Contains(t, code, "//blah")
}

func TestExamplePetStoreParseFunction(t *testing.T) {

	bodyBytes := []byte(`{"id": 5, "name": "testpet", "tag": "cat"}`)

	cannedResponse := &http.Response{
		StatusCode: 200,
		Body:       ioutil.NopCloser(bytes.NewReader(bodyBytes)),
		Header:     http.Header{},
	}
	cannedResponse.Header.Add("Content-type", "application/json")

	findPetByIDResponse, err := examplePetstoreClient.ParseFindPetByIDResponse(cannedResponse)
	assert.NoError(t, err)
	assert.NotNil(t, findPetByIDResponse.JSON200)
	assert.Equal(t, int64(5), findPetByIDResponse.JSON200.Id)
	assert.Equal(t, "testpet", findPetByIDResponse.JSON200.Name)
	assert.NotNil(t, findPetByIDResponse.JSON200.Tag)
	assert.Equal(t, "cat", *findPetByIDResponse.JSON200.Tag)
}

func TestExampleOpenAPICodeGeneration(t *testing.T) {

	// Input vars for code generation:
	packageName := "testswagger"
	opts := Configuration{
		PackageName: packageName,
		Generate: GenerateOptions{
			EchoServer:   true,
			Client:       true,
			Models:       true,
			EmbeddedSpec: true,
		},
	}

	// Get a spec from the test definition in this file:
	swagger, err := openapi3.NewLoader().LoadFromData([]byte(testOpenAPIDefinition))
	assert.NoError(t, err)

	// Run our code generation:
	code, err := Generate(swagger, opts)
	assert.NoError(t, err)
	assert.NotEmpty(t, code)

	// Check that we have valid (formattable) code:
	_, err = format.Source([]byte(code))
	assert.NoError(t, err)

	// Check that we have a package:
	assert.Contains(t, code, "package testswagger")

	// Check that response structs are generated correctly:
	assert.Contains(t, code, "type GetTestByNameResponse struct {")

	// Check that response structs contains fallbacks to interface for invalid types:
	// Here an invalid array with no items.
	assert.Contains(t, code, `
type GetTestByNameResponse struct {
	Body         []byte
	HTTPResponse *http.Response
	JSON200      *[]Test
	XML200       *[]Test
	JSON422      *[]interface{}
	XML422       *[]interface{}
	JSONDefault  *Error
}`)

	// Check that the helper methods are generated correctly:
	assert.Contains(t, code, "func (r GetTestByNameResponse) Status() string {")
	assert.Contains(t, code, "func (r GetTestByNameResponse) StatusCode() int {")
	assert.Contains(t, code, "func ParseGetTestByNameResponse(rsp *http.Response) (*GetTestByNameResponse, error) {")

	// Check the client method signatures:
	assert.Contains(t, code, "type GetTestByNameParams struct {")
	assert.Contains(t, code, "Top *int `form:\"$top,omitempty\" json:\"$top,omitempty\"`")
	assert.Contains(t, code, "func (c *Client) GetTestByName(ctx context.Context, name string, params *GetTestByNameParams, reqEditors ...RequestEditorFn) (*http.Response, error) {")
	assert.Contains(t, code, "func (c *ClientWithResponses) GetTestByNameWithResponse(ctx context.Context, name string, params *GetTestByNameParams, reqEditors ...RequestEditorFn) (*GetTestByNameResponse, error) {")
	assert.Contains(t, code, "DeadSince *time.Time    `json:\"dead_since,omitempty\" tag1:\"value1\" tag2:\"value2\"`")

	// Make sure the generated code is valid:
	checkLint(t, "test.gen.go", []byte(code))
}

func TestXGoTypeImport(t *testing.T) {
	packageName := "api"
	opts := Configuration{
		PackageName: packageName,
		Generate: GenerateOptions{
			Models: true,
		},
	}
	spec := "test_specs/x-go-type-import-pet.yaml"
	swagger, err := util.LoadSwagger(spec)
	require.NoError(t, err)

	// Run our code generation:
	code, err := Generate(swagger, opts)
	assert.NoError(t, err)
	assert.NotEmpty(t, code)

	// Check that we have valid (formattable) code:
	_, err = format.Source([]byte(code))
	assert.NoError(t, err)

	// Check that we have a package:
	assert.Contains(t, code, "package api")

	// Check import
	assert.Contains(t, code, `myuuid "github.com/google/uuid"`)

	// Check generated struct
	assert.Contains(t, code, "type Pet struct {\n\tAge myuuid.UUID `json:\"age\"`\n}")

	// Make sure the generated code is valid:
	checkLint(t, "test.gen.go", []byte(code))

}

//go:embed test_spec.yaml
var testOpenAPIDefinition string