2023-20 phew part 2 was scary at first

2023/day20/main_test.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+	"testing"
+)
+
+var example = `broadcaster -> a, b, c
+%a -> b
+%b -> c
+%c -> inv
+&inv -> a`
+
+var example2 = `broadcaster -> a
+%a -> inv, con
+&inv -> b
+%b -> con
+&con -> output`
+
+func Test_pulsePropagation(t *testing.T) {
+	tests := []struct {
+		name  string
+		input string
+		part  int
+		want  int
+	}{
+		{
+			name:  "example",
+			input: example,
+			part:  1,
+			want:  32000000,
+		},
+		{
+			name:  "example2",
+			input: example2,
+			part:  1,
+			want:  11687500,
+		},
+		{
+			name:  "actual",
+			input: input,
+			part:  1,
+			want:  817896682,
+		},
+		{
+			name:  "actual",
+			input: input,
+			part:  2,
+			want:  250924073918341,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := pulsePropagation(tt.input, tt.part); got != tt.want {
+				t.Errorf("pulsePropagation() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}