add e2e test with provider schema capabilities

enable destroy planning for the simple providers used in the e2e tests

internal/command/e2etest/provider_plugin_test.go

@@ -72,6 +72,16 @@ func TestProviderProtocols(t *testing.T) {
 	}
 
 	if !strings.Contains(stdout, "Apply complete! Resources: 2 added, 0 changed, 0 destroyed.") {
-		t.Fatalf("wrong output:\n%s", stdout)
+		t.Fatalf("wrong output:\nstdout:%s\nstderr%s", stdout, stderr)
+	}
+
+	/// DESTROY
+	stdout, stderr, err = tf.Run("destroy", "-auto-approve")
+	if err != nil {
+		t.Fatalf("unexpected apply error: %s\nstderr:\n%s", err, stderr)
+	}
+
+	if !strings.Contains(stdout, "Resources: 2 destroyed") {
+		t.Fatalf("wrong destroy output\nstdout:%s\nstderr:%s", stdout, stderr)
 	}
 }

internal/grpcwrap/provider.go

@@ -59,6 +59,10 @@ func (p *provider) GetSchema(_ context.Context, req *tfplugin5.GetProviderSchema
 		}
 	}
 
+	resp.Capabilities = &tfplugin5.GetProviderSchema_Capabilities{
+		PlanDestroy: p.schema.Capabilities.PlanDestroy,
+	}
+
 	// include any diagnostics from the original GetSchema call
 	resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, p.schema.Diagnostics)
 

internal/grpcwrap/provider6.go

@@ -59,6 +59,10 @@ func (p *provider6) GetProviderSchema(_ context.Context, req *tfplugin6.GetProvi
 		}
 	}
 
+	resp.Capabilities = &tfplugin6.GetProviderSchema_Capabilities{
+		PlanDestroy: p.schema.Capabilities.PlanDestroy,
+	}
+
 	// include any diagnostics from the original GetSchema call
 	resp.Diagnostics = convert.AppendProtoDiag(resp.Diagnostics, p.schema.Diagnostics)
 

internal/provider-simple-v6/provider.go

@@ -3,6 +3,7 @@ package simple
 
 import (
 	"errors"
+	"fmt"
 	"time"
 
 	"github.com/hashicorp/terraform/internal/configs/configschema"
@@ -42,6 +43,9 @@ func Provider() providers.Interface {
 			DataSources: map[string]providers.Schema{
 				"simple_resource": simpleResource,
 			},
+			Capabilities: providers.Capabilities{
+				PlanDestroy: true,
+			},
 		},
 	}
 }
@@ -88,7 +92,10 @@ func (s simple) PlanResourceChange(req providers.PlanResourceChangeRequest) (res
 	if req.ProposedNewState.IsNull() {
 		// destroy op
 		resp.PlannedState = req.ProposedNewState
-		resp.PlannedPrivate = req.PriorPrivate
+
+		// signal that this resource was properly planned for destruction,
+		// verifying that the schema capabilities with PlanDestroy took effect.
+		resp.PlannedPrivate = []byte("destroy planned")
 		return resp
 	}
 
@@ -104,6 +111,11 @@ func (s simple) PlanResourceChange(req providers.PlanResourceChangeRequest) (res
 
 func (s simple) ApplyResourceChange(req providers.ApplyResourceChangeRequest) (resp providers.ApplyResourceChangeResponse) {
 	if req.PlannedState.IsNull() {
+		// make sure this was transferred from the plan action
+		if string(req.PlannedPrivate) != "destroy planned" {
+			resp.Diagnostics = resp.Diagnostics.Append(fmt.Errorf("resource not planned for destroy, private data %q", req.PlannedPrivate))
+		}
+
 		resp.NewState = req.PlannedState
 		return resp
 	}

internal/provider-simple/provider.go

@@ -42,6 +42,9 @@ func Provider() providers.Interface {
 			DataSources: map[string]providers.Schema{
 				"simple_resource": simpleResource,
 			},
+			Capabilities: providers.Capabilities{
+				PlanDestroy: true,
+			},
 		},
 	}
 }