fix mock providers

internal/backend/local/testing.go

@@ -63,6 +63,13 @@ func TestLocalProvider(t *testing.T, b *Local, name string, schema *terraform.Pr
 	}
 
 	p.PlanResourceChangeFn = func(req providers.PlanResourceChangeRequest) providers.PlanResourceChangeResponse {
+		if req.ProposedNewState.IsNull() {
+			return providers.PlanResourceChangeResponse{
+				PlannedState:   req.ProposedNewState,
+				PlannedPrivate: req.PriorPrivate,
+			}
+		}
+
 		rSchema, _ := schema.SchemaForResourceType(addrs.ManagedResourceMode, req.TypeName)
 		if rSchema == nil {
 			rSchema = &configschema.Block{} // default schema is empty

internal/command/show_test.go

@@ -888,6 +888,13 @@ func showFixtureProvider() *terraform.MockProvider {
 		}
 	}
 	p.PlanResourceChangeFn = func(req providers.PlanResourceChangeRequest) providers.PlanResourceChangeResponse {
+		if req.ProposedNewState.IsNull() {
+			return providers.PlanResourceChangeResponse{
+				PlannedState:   req.ProposedNewState,
+				PlannedPrivate: req.PriorPrivate,
+			}
+		}
+
 		idVal := req.ProposedNewState.GetAttr("id")
 		amiVal := req.ProposedNewState.GetAttr("ami")
 		if idVal.IsNull() {

internal/moduletest/provider.go

@@ -242,6 +242,12 @@ func (p *Provider) UpgradeResourceState(req providers.UpgradeResourceStateReques
 // resource, and returns the planned final state.
 func (p *Provider) PlanResourceChange(req providers.PlanResourceChangeRequest) providers.PlanResourceChangeResponse {
 	log.Print("[TRACE] moduletest.Provider: PlanResourceChange")
+	if req.ProposedNewState.IsNull() {
+		return providers.PlanResourceChangeResponse{
+			PlannedState:   req.ProposedNewState,
+			PlannedPrivate: req.PriorPrivate,
+		}
+	}
 
 	var res providers.PlanResourceChangeResponse
 	if req.TypeName != "test_assertions" { // we only have one resource type

internal/provider-simple-v6/provider.go

@@ -85,6 +85,11 @@ func (s simple) ReadResource(req providers.ReadResourceRequest) (resp providers.
 }
 
 func (s simple) PlanResourceChange(req providers.PlanResourceChangeRequest) (resp providers.PlanResourceChangeResponse) {
+	if req.ProposedNewState.IsNull() {
+		resp.PlannedState = req.ProposedNewState
+		return resp
+	}
+
 	m := req.ProposedNewState.AsValueMap()
 	_, ok := m["id"]
 	if !ok {

internal/provider-simple/provider.go

@@ -85,6 +85,11 @@ func (s simple) ReadResource(req providers.ReadResourceRequest) (resp providers.
 }
 
 func (s simple) PlanResourceChange(req providers.PlanResourceChangeRequest) (resp providers.PlanResourceChangeResponse) {
+	if req.ProposedNewState.IsNull() {
+		resp.PlannedState = req.ProposedNewState
+		return resp
+	}
+
 	m := req.ProposedNewState.AsValueMap()
 	_, ok := m["id"]
 	if !ok {