testState shouldn't rely on mods from WriteState

The state returned from the testState helper shouldn't rely on any
mutations caused by WriteState. The Init function (which is analogous to
NewState) shoudl set any required fields.

command/command_test.go

@@ -160,7 +160,6 @@ func testReadPlan(t *testing.T, path string) *terraform.Plan {
 // testState returns a test State structure that we use for a lot of tests.
 func testState() *terraform.State {
 	state := &terraform.State{
-		Version: 2,
 		Modules: []*terraform.ModuleState{
 			&terraform.ModuleState{
 				Path: []string{"root"},
@@ -177,20 +176,7 @@ func testState() *terraform.State {
 		},
 	}
 	state.Init()
-
-	// Write and read the state so that it is properly initialized. We
-	// do this since we didn't call the normal NewState constructor.
-	var buf bytes.Buffer
-	if err := terraform.WriteState(state, &buf); err != nil {
-		panic(err)
-	}
-
-	result, err := terraform.ReadState(&buf)
-	if err != nil {
-		panic(err)
-	}
-
-	return result
+	return state
 }
 
 func testStateFile(t *testing.T, s *terraform.State) string {

terraform/state.go

@@ -677,6 +677,7 @@ func (s *State) init() {
 	if s.Version == 0 {
 		s.Version = StateVersion
 	}
+
 	if s.moduleByPath(rootModulePath) == nil {
 		s.addModule(rootModulePath)
 	}