aws: test timeout when no credenrtials are set

builder/amazon/common/access_config_test.go

@@ -68,3 +68,14 @@ func TestAccessConfigPrepare_RegionRestricted(t *testing.T) {
 		t.Fatal("We should be in gov region.")
 	}
 }
+
+func TestAccessConfig_NoCredentialsFailsQuickly(t *testing.T) {
+	c := &AccessConfig{
+		RawRegion: "not-empty",
+	}
+	_, err := c.Session()
+	if err == nil {
+		t.Errorf("AccessConfig.Session() error is nil")
+		return
+	}
+}