From 2be9db699627e2a37c391bca04f7d55bdc524ba2 Mon Sep 17 00:00:00 2001
From: Brandur <brandur@mutelight.org>
Date: Fri, 1 Sep 2017 10:54:00 -0700
Subject: [PATCH] Print warning when no fixture was found

Prints a warning to `stderr` when a fixture couldn't be found for a
resource ID as this is likely going to lead to problems.
---
 generator.go      |  2 ++
 util/util.go      | 11 +++++++++++
 util/util_test.go |  1 +
 3 files changed, 14 insertions(+)
 create mode 100644 util/util.go
 create mode 100644 util/util_test.go

diff --git a/generator.go b/generator.go
index 6ebf7799..0db1e5a7 100644
--- a/generator.go
+++ b/generator.go
@@ -6,6 +6,7 @@ import (
 	"strings"
 
 	"github.com/stripe/stripe-mock/spec"
+	"github.com/stripe/stripe-mock/util"
 )
 
 var errExpansionNotSupported = fmt.Errorf("Expansion not supported")
@@ -111,6 +112,7 @@ func (g *DataGenerator) generateResource(schema *spec.JSONSchema) (interface{},
 
 	fixture, ok := g.fixtures.Resources[spec.ResourceID(schema.XResourceID)]
 	if !ok {
+		util.Warningf("No fixture for: %s", spec.ResourceID(schema.XResourceID))
 		return map[string]interface{}{}, nil
 	}
 
diff --git a/util/util.go b/util/util.go
new file mode 100644
index 00000000..c92c0b44
--- /dev/null
+++ b/util/util.go
@@ -0,0 +1,11 @@
+package util
+
+import (
+	"fmt"
+	"os"
+)
+
+func Warningf(format string, a ...interface{}) {
+	format = "WARNING: " + format + "\n"
+	fmt.Fprintf(os.Stderr, format, a...)
+}
diff --git a/util/util_test.go b/util/util_test.go
new file mode 100644
index 00000000..c7d86821
--- /dev/null
+++ b/util/util_test.go
@@ -0,0 +1 @@
+package util