stacks: ensure an empty plan produces a planned status

internal/rpcapi/stacks_test.go

@@ -983,6 +983,70 @@ func TestStackChangeProgress(t *testing.T) {
 				},
 			},
 		},
+		"no-op plan": {
+			mode:   stacks.PlanMode_NORMAL,
+			source: "git::https://example.com/simple.git",
+			store: stacks_testing_provider.NewResourceStoreBuilder().
+				AddResource("resource", cty.ObjectVal(map[string]cty.Value{
+					"id":    cty.StringVal("resource"),
+					"value": cty.NullVal(cty.String),
+				})).
+				Build(),
+			state: []stackstate.AppliedChange{
+				&stackstate.AppliedChangeComponentInstance{
+					ComponentAddr:         mustAbsComponent(t, "component.self"),
+					ComponentInstanceAddr: mustAbsComponentInstance(t, "component.self"),
+				},
+				&stackstate.AppliedChangeResourceInstanceObject{
+					ResourceInstanceObjectAddr: mustAbsResourceInstanceObject(t, "component.self.testing_resource.resource"),
+					NewStateSrc: &states.ResourceInstanceObjectSrc{
+						AttrsJSON: mustMarshalJSONAttrs(map[string]interface{}{
+							"id":    "resource",
+							"value": nil,
+						}),
+						Status: states.ObjectReady,
+					},
+					ProviderConfigAddr: mustDefaultRootProvider("testing"),
+					Schema:             stacks_testing_provider.TestingResourceSchema,
+				},
+			},
+			want: []*stacks.StackChangeProgress{
+				{
+					Event: &stacks.StackChangeProgress_ComponentInstanceStatus_{
+						ComponentInstanceStatus: &stacks.StackChangeProgress_ComponentInstanceStatus{
+							Addr: &stacks.ComponentInstanceInStackAddr{
+								ComponentAddr:         "component.self",
+								ComponentInstanceAddr: "component.self",
+							},
+							Status: stacks.StackChangeProgress_ComponentInstanceStatus_PLANNED,
+						},
+					},
+				},
+			},
+		},
+		"empty plan": {
+			mode:   stacks.PlanMode_NORMAL,
+			source: "git::https://example.com/empty.git",
+			state: []stackstate.AppliedChange{
+				&stackstate.AppliedChangeComponentInstance{
+					ComponentAddr:         mustAbsComponent(t, "component.self"),
+					ComponentInstanceAddr: mustAbsComponentInstance(t, "component.self"),
+				},
+			},
+			want: []*stacks.StackChangeProgress{
+				{
+					Event: &stacks.StackChangeProgress_ComponentInstanceStatus_{
+						ComponentInstanceStatus: &stacks.StackChangeProgress_ComponentInstanceStatus{
+							Addr: &stacks.ComponentInstanceInStackAddr{
+								ComponentAddr:         "component.self",
+								ComponentInstanceAddr: "component.self",
+							},
+							Status: stacks.StackChangeProgress_ComponentInstanceStatus_PLANNED,
+						},
+					},
+				},
+			},
+		},
 	}
 
 	for name, tc := range tcs {

internal/rpcapi/testdata/sourcebundle/empty/empty.tf

@@ -0,0 +1,10 @@
+terraform {
+  required_providers {
+    testing = {
+      source  = "hashicorp/testing"
+      version = "0.1.0"
+    }
+  }
+}
+
+# Empty by design

internal/rpcapi/testdata/sourcebundle/empty/empty.tfcomponent.hcl

@@ -0,0 +1,16 @@
+required_providers {
+  testing = {
+    source  = "hashicorp/testing"
+    version = "0.1.0"
+  }
+}
+
+provider "testing" "default" {}
+
+component "self" {
+  source = "./"
+
+  providers = {
+    testing = provider.testing.default
+  }
+}

internal/rpcapi/testdata/sourcebundle/terraform-sources.json

@@ -40,6 +40,11 @@
       "source": "git::https://example.com/simple.git",
       "local": "simple",
       "meta": {}
+    },
+    {
+      "source": "git::https://example.com/empty.git",
+      "local": "empty",
+      "meta": {}
     }
   ]
 }