code kata 230811

code_kata_230811/int_to_string_test.go

@@ -0,0 +1,72 @@
+package main
+
+import "testing"
+
+func IntToString(n int) string {
+	var ret []byte
+	for n > 0 {
+		ret = append(ret, '0'+byte(n%10))
+		n /= 10
+	}
+	return ReverseString(string(ret))
+}
+
+func IntToString2(n int) string {
+	var ret []byte
+	for n > 0 {
+		ret = append([]byte{'0' + byte(n%10)}, ret...)
+		n /= 10
+	}
+	return string(ret)
+}
+
+func ReverseString(s string) string {
+	ret := []rune(s)
+	for l, r := 0, len(ret)-1; l < r; l, r = l+1, r-1 {
+		ret[l], ret[r] = ret[r], ret[l]
+	}
+	return string(ret)
+}
+
+func TestReverseString(t *testing.T) {
+	tt := []struct {
+		name  string
+		input string
+		want  string
+	}{
+		{"test", "test", "tset"},
+		{"testing", "testing", "gnitset"},
+		{"i am testing", "i am testing", "gnitset ma i"},
+	}
+
+	for _, tc := range tt {
+		t.Run(tc.name, func(t *testing.T) {
+			got := ReverseString(tc.input)
+			if got != tc.want {
+				t.Errorf("ReverseString(%s) = %s, want %s\n", tc.input, got, tc.want)
+			}
+		})
+	}
+}
+
+func TestIntToString(t *testing.T) {
+	tt := []struct {
+		name  string
+		input int
+		want  string
+	}{
+		{"1", 1, "1"},
+		{"12", 12, "12"},
+		{"123", 123, "123"},
+	}
+
+	for _, tc := range tt {
+		t.Run(tc.name, func(t *testing.T) {
+			//got := IntToString(tc.input)
+			got := IntToString2(tc.input)
+			if got != tc.want {
+				t.Errorf("IntToString(%d) = %s, want %s\n", tc.input, got, tc.want)
+			}
+		})
+	}
+}