34: digit factorials

34_digit_factorials/main_test.go

@@ -0,0 +1,108 @@
+package main
+
+import (
+	"reflect"
+	"testing"
+)
+
+func Test_factorialOf(t *testing.T) {
+	type args struct {
+		n int
+	}
+	tt := []struct {
+		name string
+		args args
+		want int
+	}{
+		{
+			"1",
+			args{1},
+			1,
+		},
+		{
+			"2",
+			args{2},
+			2,
+		},
+		{
+			"4",
+			args{4},
+			24,
+		},
+		{
+			"10",
+			args{10},
+			3628800,
+		},
+	}
+	for _, tc := range tt {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := factorialOf(tc.args.n); got != tc.want {
+				t.Errorf("factorialOf() = %v, want %v", got, tc.want)
+			}
+		})
+	}
+}
+
+func Test_splitNumber(t *testing.T) {
+	type args struct {
+		n int
+	}
+	tt := []struct {
+		name string
+		args args
+		want []int
+	}{
+		{
+			"13",
+			args{13},
+			[]int{1, 3},
+		},
+		{
+			"123",
+			args{123},
+			[]int{1, 2, 3},
+		},
+	}
+	for _, tc := range tt {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := splitNumber(tc.args.n); !reflect.DeepEqual(got, tc.want) {
+				t.Errorf("splitNumber() = %v, want %v", got, tc.want)
+			}
+		})
+	}
+}
+
+func Test_sumNumberFactorials(t *testing.T) {
+	type args struct {
+		ns []int
+	}
+	tt := []struct {
+		name string
+		args args
+		want int
+	}{
+		{
+			"1",
+			args{[]int{1}},
+			1,
+		},
+		{
+			"12",
+			args{[]int{1, 2}},
+			3,
+		},
+		{
+			"123",
+			args{[]int{1, 2, 3}},
+			9,
+		},
+	}
+	for _, tc := range tt {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := sumNumberFactorials(tc.args.ns); got != tc.want {
+				t.Errorf("sumNumberFactorials() = %v, want %v", got, tc.want)
+			}
+		})
+	}
+}