code kata 230818

code_kata_230818/int_to_string_test.go

@@ -0,0 +1,44 @@
+package main
+
+import "testing"
+
+func IntToString(n int) string {
+	r := make([]byte, 0)
+	m := false
+	if n < 0 {
+		m = true
+		n = -n
+	}
+	for n > 0 {
+		r = append(r, byte('0'+n%10))
+		n /= 10
+	}
+	if m {
+		r = append(r, '-')
+	}
+	for s, e := 0, len(r)-1; s < e; s, e = s+1, e-1 {
+		r[s], r[e] = r[e], r[s]
+	}
+	return string(r)
+}
+
+func TestIntToString(t *testing.T) {
+	tt := []struct {
+		name  string
+		input int
+		want  string
+	}{
+		{"1", 1, "1"},
+		{"12", 12, "12"},
+		{"-12", -12, "-12"},
+	}
+
+	for _, tc := range tt {
+		t.Run(tc.name, func(t *testing.T) {
+			got := IntToString(tc.input)
+			if got != tc.want {
+				t.Errorf("IntToString(%d) = %s, want %s\n", tc.input, got, tc.want)
+			}
+		})
+	}
+}