day20, modules state comparations

day20/propagation_test.go

@@ -1,6 +1,7 @@
 package day20
 
 import (
+	"log"
 	"testing"
 )
 
@@ -41,6 +42,8 @@ func TestPropagateButtonPressExample2FourSteps(t *testing.T) {
 	t.Log("got modules:\n", modules)
 	InitStuffs(modules)
 
+	initialModulesState := ModulesState(modules)
+
 	low, high := PropagateButtonPress(modules)
 	t.Logf("got low %d and high %d\n", low, high)
 	t.Log("#1 button press:\n", modules)
@@ -56,6 +59,10 @@ func TestPropagateButtonPressExample2FourSteps(t *testing.T) {
 	if !success {
 		t.Errorf("expected low 4 got %d, high 2 got %d", low, high)
 	}
+	secondState := ModulesState(modules)
+	if initialModulesState == secondState {
+		t.Error("initial state should be different from second")
+	}
 
 	low, high = PropagateButtonPress(modules)
 	t.Logf("got low %d and high %d\n", low, high)
@@ -64,6 +71,10 @@ func TestPropagateButtonPressExample2FourSteps(t *testing.T) {
 	if !success {
 		t.Errorf("expected low 5 got %d, high 3 got %d", low, high)
 	}
+	thirdState := ModulesState(modules)
+	if initialModulesState == thirdState {
+		t.Error("initial state should be different from third")
+	}
 
 	low, high = PropagateButtonPress(modules)
 	t.Logf("got low %d and high %d\n", low, high)
@@ -73,4 +84,12 @@ func TestPropagateButtonPressExample2FourSteps(t *testing.T) {
 		t.Errorf("expected low 4 got %d, high 2 got %d", low, high)
 	}
 
+	lastState := ModulesState(modules)
+
+	log.Print("initial modules state:\n", initialModulesState)
+	log.Print("after 4 steps modules state:\n", lastState)
+	if initialModulesState != lastState {
+		t.Error("expected state to be same after 4 steps for example 2")
+	}
+
 }