16: power digit sum

16_power_digit_sum/power_digit_sum_test.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+)
+
+func TestSumDigits(t *testing.T) {
+	tt := []struct {
+		name    string
+		input   string
+		want    int
+		wantErr error
+	}{
+		{
+			"invalid",
+			"abc",
+			0,
+			fmt.Errorf("invalid input: %s", "abc"),
+		},
+		{
+			"invalid_2",
+			"1a",
+			0,
+			fmt.Errorf("invalid input: %s", "1a"),
+		},
+		{
+			"1",
+			"1",
+			1,
+			nil,
+		},
+		{
+			"123",
+			"123",
+			6,
+			nil,
+		},
+		{
+			"2345",
+			"2345",
+			14,
+			nil,
+		},
+	}
+
+	for _, tc := range tt {
+		t.Run(tc.name, func(t *testing.T) {
+			got, err := SumDigits(tc.input)
+			if !reflect.DeepEqual(err, tc.wantErr) {
+				t.Errorf("SumDigits(%s) err=%v want err %v", tc.input, err, tc.wantErr)
+				return
+			}
+			if got != tc.want {
+				t.Errorf("SumDigits(%s)=%d, want %d", tc.input, got, tc.want)
+			}
+		})
+	}
+}