Update API client prototype design based on design.

service/smithyprototype/lexruntimeservice/api_client_example_test.go

@@ -0,0 +1,59 @@
+package lexruntimeservice_test
+
+import (
+	"context"
+	"fmt"
+	"log"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+	lexruntime "github.com/aws/aws-sdk-go-v2/service/smithyprototype/lexruntimeservice"
+)
+
+func ExampleNewClient() {
+	cfg, err := external.LoadDefaultAWSConfig()
+	if err != nil {
+		log.Fatalf("failed to load config, %v", err)
+	}
+
+	client := lexruntime.NewClient(cfg)
+	res, err := client.GetSession(context.TODO(), &lexruntime.GetSessionInput{
+		BotAlias: aws.String("botAlias"),
+		BotName:  aws.String("botName"),
+		UserId:   aws.String("userID"),
+	})
+	if err != nil {
+		log.Fatalf("failed to get session, %v", err)
+	}
+
+	fmt.Println("session:", res.SessionId)
+}
+
+func ExampleNewClient_customOptions() {
+	cfg, err := external.LoadDefaultAWSConfig()
+	if err != nil {
+		log.Fatalf("failed to load config, %v", err)
+	}
+
+	client := lexruntime.NewClient(cfg, func(o *lexruntime.ClientOptions) {
+		o.RegionID = "us-west-2"
+	})
+	res, err := client.GetSession(context.TODO(), &lexruntime.GetSessionInput{
+		BotAlias: aws.String("botAlias"),
+		BotName:  aws.String("botName"),
+		UserId:   aws.String("userID"),
+	})
+	if err != nil {
+		log.Fatalf("failed to get session, %v", err)
+	}
+
+	fmt.Println("session:", res.SessionId)
+}
+
+var external = mockExternal{}
+
+type mockExternal struct {
+}
+
+func (mockExternal) LoadDefaultAWSConfig() (aws.Config, error) {
+	return aws.Config{}, nil
+}