Tests were failing incorrectly when OpenStack environment variables were set...

Tests were failing incorrectly when OpenStack environment variables were set in the environment running the tests

builder/openstack/access_config_test.go

 package openstack
 
 import (
+	"os"
 	"testing"
 )
 
+func init() {
+	// Clear out the openstack env vars so they don't
+	// affect our tests.
+	os.Setenv("SDK_REGION", "")
+	os.Setenv("OS_REGION_NAME", "")
+}
+
 func testAccessConfig() *AccessConfig {
 	return &AccessConfig{}
 }
@@ -16,6 +24,38 @@ func TestAccessConfigPrepare_NoRegion_Rackspace(t *testing.T) {
 	}
 }
 
+func TestAccessConfigRegionWithEmptyEnv(t *testing.T) {
+	c := testAccessConfig()
+	c.Prepare(nil)
+	if c.Region() != "" {
+		t.Fatalf("Region should be empty")
+	}
+}
+
+func TestAccessConfigRegionWithSdkRegionEnv(t *testing.T) {
+	c := testAccessConfig()
+	c.Prepare(nil)
+
+	expectedRegion := "sdk_region"
+	os.Setenv("SDK_REGION", expectedRegion)
+	os.Setenv("OS_REGION_NAME", "")
+	if c.Region() != expectedRegion {
+		t.Fatalf("Region should be: %s", expectedRegion)
+	}
+}
+
+func TestAccessConfigRegionWithOsRegionNameEnv(t *testing.T) {
+	c := testAccessConfig()
+	c.Prepare(nil)
+
+	expectedRegion := "os_region_name"
+	os.Setenv("SDK_REGION", "")
+	os.Setenv("OS_REGION_NAME", expectedRegion)
+	if c.Region() != expectedRegion {
+		t.Fatalf("Region should be: %s", expectedRegion)
+	}
+}
+
 func TestAccessConfigPrepare_NoRegion_PrivateCloud(t *testing.T) {
 	c := testAccessConfig()
 	c.Provider = "http://some-keystone-server:5000/v2.0"