英文:
Table tests for multi-return value function
问题
我正在学习Go语言，并且在研究表驱动测试时遇到了以下问题：
我有一个返回多个值的函数：
// 将整数除以2，并返回是否为偶数的布尔值。
func half(n int) (int, bool) {
h := n / 2
e := n%2 == 0
return h, e
}
我知道对于 half(1)，返回值应该是 0, false，对于 half(2)，返回值应该是 1, true，但是我似乎无法弄清楚如何将其放入表格中。
如何创建一个类似下面的表格呢？
var halfTests = []struct {
in int
out string
}{
{1, "<0, false>"},
{3, "<1, true>"},
}
是否有其他更符合惯用方式的方法？
作为参考，这里有一个类似FizzBuzz函数的测试，使用了表格：
var fizzbuzzTests = []struct {
in int
out string
}{
{1, "1"},
{3, "Fizz"},
{5, "Buzz"},
{75, "FizzBuzz"},
}
func TestFizzBuzz(t *testing.T) {
for _, tt := range fizzbuzzTests {
s := FizzBuzz(tt.in)
if s != tt.out {
t.Errorf("Fizzbuzz(%d) => %s, want %s", tt.in, s, tt.out)
}
}
}
英文:
I'm cutting my teeth on Go and after digging into table driven tests I ran into the following problem:
I have a function that returns multiple values
// Halves an integer and and returns true if it was even or false if it was odd.
func half(n int) (int, bool) {
h := n / 2
e := n%2 == 0
return h, e
}
I know that for half(1) the return value should be 0, false and for half(2) it should match 1, true, but I can't seem to figure out how to put this on a table.
How would one go to have something that resembles the following?
var halfTests = []struct {
in int
out string
}{
{1, <0, false>},
{3, <1, true>},
}
Is there any other, more idiomatic way of doing this?
For reference, here's a test for something that resembles a FizzBuzz function, using tables:
var fizzbuzzTests = []struct {
in int
out string
}{
{1, "1"},
{3, "Fizz"},
{5, "Buzz"},
{75, "FizzBuzz"},
}
func TestFizzBuzz(t *testing.T) {
for _, tt := range fizzbuzzTests {
s := FizzBuzz(tt.in)
if s != tt.out {
t.Errorf("Fizzbuzz(%d) => %s, want %s", tt.in, s, tt.out)
}
}
}
答案1
得分: 11
只需在结构体中添加另一个字段来保存第二个返回值。示例代码如下：
var halfTests = []struct {
in int
out1 int
out2 bool
}{
{1, 0, false},
{3, 1, true},
}
func TestHalf(t *testing.T) {
for _, tt := range halfTests {
s, t := half(tt.in)
if s != tt.out1 || t != tt.out2 {
t.Errorf("half(%d) => %d, %v, want %d, %v", tt.in, s, t, tt.out1, tt.out2)
}
}
}
请注意，这里将第二个返回值命名为t，以避免与测试函数中的t变量冲突。
英文:
Just add another field to your struct that holds the second return value. Example:
var halfTests = []struct {
in int
out1 int
out2 bool
}{
{1, 0, false},
{3, 1, true},
}
Your testing function would look like the following:
func TestHalf(t *testing.T) {
for _, tt := range halfTests {
s, t := half(tt.in)
if s != tt.out1 || t != tt.out2 {
t.Errorf("half(%d) => %d, %v, want %d, %v", tt.in, s, t, tt.out1, tt.out2)
}
}
}
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