From 48dd8ddec5256b3d09b9fe36994b11f5c2043a0a Mon Sep 17 00:00:00 2001
From: Martin Atkins <mart@degeneration.co.uk>
Date: Wed, 26 Sep 2018 09:51:40 -0700
Subject: [PATCH] core: test helper contextOptsForPlanViaFile to set default
 backend

A plan file without a backend set is not valid, but at the level we're
testing in this package we don't really care about backends so we'll just
set a default one if the caller doesn't set something more specific, and
then we'll just ignore it completely when reading back.
---
 terraform/context_test.go | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/terraform/context_test.go b/terraform/context_test.go
index 7a5b78ecd..5349bff6e 100644
--- a/terraform/context_test.go
+++ b/terraform/context_test.go
@@ -718,6 +718,20 @@ func contextOptsForPlanViaFile(configSnap *configload.Snapshot, state *states.St
 		State: state,
 	}
 
+	// To make life a little easier for test authors, we'll populate a simple
+	// backend configuration if they didn't set one, since the backend is
+	// usually dealt with in a calling package and so tests in this package
+	// don't really care about it.
+	if plan.Backend.Config == nil {
+		cfg, err := plans.NewDynamicValue(cty.EmptyObjectVal, cty.EmptyObject)
+		if err != nil {
+			panic(fmt.Sprintf("NewDynamicValue failed: %s", err)) // shouldn't happen because we control the inputs
+		}
+		plan.Backend.Type = "local"
+		plan.Backend.Config = cfg
+		plan.Backend.Workspace = "default"
+	}
+
 	filename := filepath.Join(dir, "tfplan")
 	err = planfile.Create(filename, configSnap, stateFile, plan)
 	if err != nil {