aws/endpoints: Update unit tests use static data instead of live model

aws/endpoints/endpoints_test.go

@@ -5,6 +5,12 @@ package endpoints
 
 import "testing"
 
+// ***************************************************************************
+// All endpoint metadata is sourced from the testdata/endpoints.json file at
+// test startup. Not the live endpoints model file. Update the testdata file
+// for the tests to use the latest live model.
+// ***************************************************************************
+
 func TestEnumDefaultPartitions(t *testing.T) {
 	resolver := DefaultResolver()
 	enum, ok := resolver.(EnumPartitions)

aws/endpoints/example_test.go

@@ -13,6 +13,12 @@ import (
 	"github.com/aws/aws-sdk-go/service/sqs"
 )
 
+// ***************************************************************************
+// All endpoint metadata is sourced from the testdata/endpoints.json file at
+// test startup. Not the live endpoints model file. Update the testdata file
+// for the tests to use the latest live model.
+// ***************************************************************************
+
 func ExampleEnumPartitions() {
 	resolver := endpoints.DefaultResolver()
 	partitions := resolver.(endpoints.EnumPartitions).Partitions()
@@ -31,7 +37,9 @@ func ExampleEnumPartitions() {
 }
 
 func ExampleResolverFunc() {
-	myCustomResolver := func(service, region string, optFns ...func(*endpoints.Options)) (endpoints.ResolvedEndpoint, error) {
+	myCustomResolver := func(service, region string, optFns ...func(*endpoints.Options)) (
+		endpoints.ResolvedEndpoint, error,
+	) {
 		if service == endpoints.S3ServiceID {
 			return endpoints.ResolvedEndpoint{
 				URL:           "s3.custom.endpoint.com",

aws/endpoints/main_test.go

@@ -0,0 +1,49 @@
+package endpoints
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+// Update all endpoints partition variables data to be the static testdata
+// model instead of the dynamic live model. This ensures that endpoint tests
+// are tested against static data, and will not break when the live
+// endpoints.json model is updated.
+
+func TestMain(m *testing.M) {
+	testdataFilename := filepath.Join("testdata", "endpoints.json")
+
+	testdataFile, err := os.Open(testdataFilename)
+	if err != nil {
+		panic(fmt.Sprintf("failed to open test endpoints model, %v", err))
+	}
+
+	resolver, err := DecodeModel(testdataFile)
+	if err != nil {
+		panic(fmt.Sprintf("failed to decode test endpoints model, %v", err))
+	}
+
+	partitions, ok := resolver.(partitions)
+	if !ok {
+		panic(fmt.Sprintf("expect %T resolver, got %T", partitions, resolver))
+	}
+
+	for _, p := range partitions {
+		switch p.ID {
+		case "aws":
+			awsPartition = p
+		case "aws-cn":
+			awscnPartition = p
+		case "aws-us-gov":
+			awsusgovPartition = p
+		case "aws-iso":
+			awsisoPartition = p
+		case "aws-iso-b":
+			awsisobPartition = p
+		default:
+			panic("unknown endpoints partition " + p.ID)
+		}
+	}
+}