Fix flakey test run on OSX

On OSX newer versions of docker treat the host 'localhost' differently than '127.0.0.1'. Using resource.GetHostPort for url building will return an OS appropriate hostname

hcvault/keysource_test.go

@@ -25,7 +25,8 @@ func TestMain(m *testing.M) {
 		logger.Fatalf("Could not start resource: %s", err)
 	}
 
-	os.Setenv("VAULT_ADDR", fmt.Sprintf("http://127.0.0.1:%v", resource.GetPort("8200/tcp")))
+	vaultAddr := fmt.Sprintf("http://%s", resource.GetHostPort("8200/tcp"))
+	os.Setenv("VAULT_ADDR", vaultAddr)
 	os.Setenv("VAULT_TOKEN", "secret")
 	// exponential backoff-retry, because the application in the container might not be ready to accept connections yet
 	if err := pool.Retry(func() error {
@@ -45,7 +46,7 @@ func TestMain(m *testing.M) {
 		logger.Fatalf("Could not connect to docker: %s", err)
 	}
 
-	key := NewMasterKey(fmt.Sprintf("http://127.0.0.1:%v", resource.GetPort("8200/tcp")), "sops", "main")
+	key := NewMasterKey(vaultAddr, "sops", "main")
 	err = key.createVaultTransitAndKey()
 	if err != nil {
 		logger.Fatal(err)