英文:
Test to check if a function didn't run?
问题
所以我对测试还不太熟悉，我在尝试为一个触发另一个函数的函数编写测试时遇到了困难。这是我目前的代码，但如果函数没有运行，它会变得有些反向并且永远阻塞：
var cha = make(chan bool, 1)
func TestFd(t *testing.T) {
c := &fd.Fdcount{Interval: 1, MaxFiles: 1}
c.Start(trigger)
if <-cha {
}
}
func trigger(i int) {
cha <- true
}
当满足某些条件时，c.Start 将触发 trigger() 函数。它每隔 1 秒测试一次是否满足条件。
错误情况是函数无法运行。有没有办法测试这种情况，或者是否可以使用测试包来测试成功（例如 t.Pass()）？
英文:
So I'm new to testing in general and I'm stuck trying to write a test for a function that triggers another function. This is what I have so far but it's kind of backwards and blocks forever if the function doesn't run:
var cha = make(chan bool, 1)
func TestFd(t *testing.T) {
c := &fd.Fdcount{Interval: 1, MaxFiles: 1}
c.Start(trigger)
if <- cha {
}
}
func trigger(i int) {
cha <- true
}
c.Start will trigger the trigger() function when certain criteria is met. It tests whether or not the criteria is met every 1 second.
The error case is when the function fails to run. Is there a way to test for this or is there a way to use the testing package to test for success (e.g. t.Pass())?
答案1
得分: 2
如果c.Start是同步的，你可以简单地传递一个函数来设置测试用例范围内的一个值，然后根据该值进行测试。考虑下面示例中由trigger函数设置的functionCalled变量（playground）：
func TestFd(t *testing.T) {
functionCalled := false
trigger := func(i int) {
functionCalled = true;
}
c := &fd.Fdcount{Interval: 1, MaxFiles: 1}
c.Start(trigger)
if !functionCalled {
t.FatalF("function was not called")
}
}
如果c.Start是异步的，你可以使用select语句来实现一个超时，在给定的时间范围内未调用传递的函数时，测试将失败（playground）：
func TestFd(t *testing.T) {
functionCalled := make(chan bool)
timeoutSeconds := 1 * time.Second
trigger := func(i int) {
functionCalled <- true
}
timeout := time.After(timeoutSeconds)
c := &SomeStruct{}
c.Start(trigger)
select {
case <- functionCalled:
t.Logf("function was called")
case <- timeout:
t.Fatalf("function was not called within timeout")
}
}
英文:
If c.Start is synchronous, you can simply pass a function that sets a value in the test case's scope, and then test against that value. Condider the functionCalled variable in the example below that is set by the trigger function (playground):
func TestFd(t *testing.T) {
functionCalled := false
trigger := func(i int) {
functionCalled = true;
}
c := &fd.Fdcount{Interval: 1, MaxFiles: 1}
c.Start(trigger)
if !functionCalled {
t.FatalF("function was not called")
}
}
If c.Start is asynchronous, you can use a select statement to implement a timeout that will fail the test when the passed function was not called within a given time frame (playground):
func TestFd(t *testing.T) {
functionCalled := make(chan bool)
timeoutSeconds := 1 * time.Second
trigger := func(i int) {
functionCalled <- true
}
timeout := time.After(timeoutSeconds)
c := &SomeStruct{}
c.Start(trigger)
select {
case <- functionCalled:
t.Logf("function was called")
case <- timeout:
t.Fatalf("function was not called within timeout")
}
}
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