英文:
First golang test run is slow
问题
我正在运行一个非常简单的测试，将两个数字相加。
package internal
import "testing"
func TestAddingNumbers(t *testing.T) {
if add(1, 5) != 6 {
t.Errorf("Failed Adding numbers")
}
}
首先，go test -v file.go file_test.go 运行结果为 => ok command-line-arguments 0.434s
而第二次运行
go test -v file.go file_test.go 结果为 => ok command-line-arguments 0.099s
有没有办法让第一次测试更快？
我理解的是，第二次运行更快是因为存在一些缓存。
但在 CI 步骤的上下文中，缓存是不存在的，这会导致速度变慢。
英文:
I'm running a very simple test adding two numbers.
package internal
import "testing"
func TestAddingNumbers(t *testing.T) {
if add(1, 5) != 6 {
t.Errorf("Failed Adding numbers")
}
}
First
go test -v file.go file_test.go runs in => ok command-line-arguments 0.434s
While second in
go test -v file.go file_test.go runs in => ok command-line-arguments 0.099s
Is there a way to make first test faster?
My understanding is that there is some caching happening so the second is faster.
But in the context of CI step, cache won't be there and it will makes things slow.
答案1
得分: 4
你无法让第一个运行更快，因为那是测试实际运行的唯一时间。第二次运行只是使用测试缓存，而不运行测试。
但是，你可以通过禁用测试缓存来使测试运行时间相似。惯用的方法是使用以下标志：
go test -count=1
英文:
You cannot make the first one run faster, because that's the only time the test actually runs. The second run is simply using the test cache, without running the test.
However, you can make the test runs use similar times by disabling the test cache. The idiomatic way to do that is to use the flag:
go test -count=1
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