Relax test to focus on the behavior we care about (encoded == encoded)

The specific output order is meaningless, but it should always be the same after
two Encode() calls with identical (ignoring in-memory order) dependency sets.

internal/states/instance_object_test.go

@@ -12,26 +12,39 @@ func TestResourceInstanceObject_encode(t *testing.T) {
 	value := cty.ObjectVal(map[string]cty.Value{
 		"foo": cty.True,
 	})
-	deps := []addrs.ConfigResource{
+	// The in-memory order of resource dependencies is random, since they're an
+	// unordered set.
+	depsOne := []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{
+	depsTwo := []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{
+	rioOne := &ResourceInstanceObject{
 		Value:        value,
 		Status:       ObjectPlanned,
-		Dependencies: deps,
+		Dependencies: depsOne,
 	}
-	rios, err := rio.Encode(value.Type(), 0)
+	rioTwo := &ResourceInstanceObject{
+		Value:        value,
+		Status:       ObjectPlanned,
+		Dependencies: depsTwo,
+	}
+	riosOne, err := rioOne.Encode(value.Type(), 0)
 	if err != nil {
 		t.Fatalf("unexpected error: %s", err)
 	}
-	if diff := cmp.Diff(wantDeps, rios.Dependencies); diff != "" {
+	riosTwo, err := rioTwo.Encode(value.Type(), 0)
-		t.Errorf("wrong result for deps\n%s", diff)
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	// However, identical sets of dependencies should always be written to state
+	// in an identical order, so we don't do meaningless state updates on refresh.
+	if diff := cmp.Diff(riosOne.Dependencies, riosTwo.Dependencies); diff != "" {
+		t.Errorf("identical dependencies got encoded in different orders:\n%s", diff)
 	}
 }