2016-day15: simple linear equation for position alignments

2016/day15/main_test.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/alexchao26/advent-of-code-go/util"
+)
+
+var example = `Disc #1 has 5 positions; at time=0, it is at position 4.
+Disc #2 has 2 positions; at time=0, it is at position 1.`
+
+func Test_timingIsEverything(t *testing.T) {
+	tests := []struct {
+		name  string
+		input string
+		part  int
+		want  int
+	}{
+		{"example", example, 1, 5},
+		{"actual", util.ReadFile("input.txt"), 1, 317371},
+		{"actual", util.ReadFile("input.txt"), 2, 2080951},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := timingIsEverything(tt.input, tt.part); got != tt.want {
+				t.Errorf("timingIsEverything() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}