Move code out of cmd

day1/main_test.go

@@ -0,0 +1,80 @@
+package main
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_dial_Add2(t *testing.T) {
+	tests := []struct {
+		start      int
+		turn       int
+		want       int
+		wantClicks int
+	}{
+		{
+			start:      50,
+			turn:       300,
+			want:       50,
+			wantClicks: 3,
+		},
+		{
+			start:      50,
+			turn:       -300,
+			want:       50,
+			wantClicks: 3,
+		},
+
+		{
+			start:      0,
+			turn:       -100,
+			want:       0,
+			wantClicks: 1,
+		},
+		{
+			start:      1,
+			turn:       -101,
+			want:       0,
+			wantClicks: 2,
+		},
+		{
+			start:      99,
+			turn:       -199,
+			want:       0,
+			wantClicks: 2,
+		},
+
+		{
+			start:      0,
+			turn:       100,
+			want:       0,
+			wantClicks: 1,
+		},
+		{
+			start:      99,
+			turn:       101,
+			want:       0,
+			wantClicks: 2,
+		},
+		{
+			start:      1,
+			turn:       199,
+			want:       0,
+			wantClicks: 2,
+		},
+	}
+	for _, tt := range tests {
+		name := fmt.Sprintf("R%d", tt.turn)
+		if tt.turn < 0 {
+			name = fmt.Sprintf("L%d", -tt.turn)
+		}
+		t.Run(name, func(t *testing.T) {
+			d := dial{n: tt.start}
+			d.Add2(tt.turn)
+			assert.Equal(t, tt.want, d.n, "dial")
+			assert.Equal(t, tt.wantClicks, d.zeroClicks, "clicks")
+		})
+	}
+}