diff --git a/internal/states/instance_object_test.go b/internal/states/instance_object_test.go
new file mode 100644
index 000000000..f8be9743e
--- /dev/null
+++ b/internal/states/instance_object_test.go
@@ -0,0 +1,37 @@
+package states
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/hashicorp/terraform/internal/addrs"
+	"github.com/zclconf/go-cty/cty"
+)
+
+func TestResourceInstanceObject_encode(t *testing.T) {
+	value := cty.ObjectVal(map[string]cty.Value{
+		"foo": cty.True,
+	})
+	deps := []addrs.ConfigResource{
+		addrs.RootModule.Resource(addrs.ManagedResourceMode, "test", "honk"),
+		addrs.RootModule.Child("child").Resource(addrs.ManagedResourceMode, "test", "flub"),
+		addrs.RootModule.Resource(addrs.ManagedResourceMode, "test", "boop"),
+	}
+	wantDeps := []addrs.ConfigResource{
+		addrs.RootModule.Child("child").Resource(addrs.ManagedResourceMode, "test", "flub"),
+		addrs.RootModule.Resource(addrs.ManagedResourceMode, "test", "boop"),
+		addrs.RootModule.Resource(addrs.ManagedResourceMode, "test", "honk"),
+	}
+	rio := &ResourceInstanceObject{
+		Value:        value,
+		Status:       ObjectPlanned,
+		Dependencies: deps,
+	}
+	rios, err := rio.Encode(value.Type(), 0)
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	if diff := cmp.Diff(wantDeps, rios.Dependencies); diff != "" {
+		t.Errorf("wrong result for deps\n%s", diff)
+	}
+}