Go Common Test
原创Go Common Test
原创
This article is also posted on my blog, feel free to check the latest revision: Go Common Test
The test methods in Go mainly include three types: unit test, benchmark test, and example test.
First of all:
- You should import the
testingpackage first. - In the package directory, all source code files with the suffix
*_test.goare part of the go test test, and will not be compiled into the final executable file by go build.
Unit Test
The basic format/signature is:
func TestXxx(t *testing.T) {
// ...
}Put the _test.go and .go in the same dir, and run go test -v to execute the test detailed, the go test -cover to check the coverage of the test.
Benchmark test
The benchmark test will not be excuted by default, you need to use go test -bench=Xxx to execute the benchmark test.
The basic format/signature is:
func BenchmarkXxx(b *testing.B) {
for i := 0; i < b.N; i++ {
// ...
}
}The b.N is the number of times the test is run, and the b.N is automatically adjusted by the go test tool.
BenchmarkSplit-8 10000000 215 ns/op- The
-8means the test is run on the 8 GOMAXPROCS - The
10000000means the test is run 10000000 times. - The
215 ns/opmeans the test takes 215 nanoseconds average per operation.
go test -bench=Xxx -benchmem can check the memory allocation and the number of allocations per operation.
BenchmarkSplit-8 10000000 215 ns/op 112 B/op 3 allocs/op- The
112 B/opmeans the test allocates 112 bytes per operation. - The
3 allocs/opmeans the test allocates 3 times per operation.
Performance comparison
// note: the n is the parameter of Fib not the b.N, the b.N is the number of times the test is run. it will be automatically adjusted by the go test tool.
func benchmarkFib(b *testing.B, n int) {
for i := 0; i < b.N; i++ {
Fib(n)
}
}
func BenchmarkFib1(b *testing.B) { benchmarkFib(b, 1) }
func BenchmarkFib2(b *testing.B) { benchmarkFib(b, 2) }
func BenchmarkFib3(b *testing.B) { benchmarkFib(b, 3) }go test -bench=. will execute the benchmark test for all functions with the prefix Benchmark.
func BenchmarkSplit(b *testing.B) {
time.Sleep(5 * time.Second) // some time-consuming operations
b.ResetTimer() // reset the timer(ignore the time above)
for i := 0; i < b.N; i++ {
// some time-consuming operations
}
}
// you can also use this method
func BenchmarkSplit(b *testing.B) {
b.StopTimer()
// some time-consuming operations
b.StartTimer()
for i := 0; i < b.N; i++ {
// some time-consuming operations
}
}Parallel test
Signature:
func BenchmarkSplitParallel(b *testing.B) {
// b.SetParallelism(1) // set the number of CPU to use
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
// some time-consuming operations
}
})
}Example test
Signature:
func ExampleName() {
// No parameters and no return
}原创声明：本文系作者授权腾讯云开发者社区发表，未经许可，不得转载。
如有侵权，请联系 cloudcommunity@tencent.com 删除。
原创声明：本文系作者授权腾讯云开发者社区发表，未经许可，不得转载。
如有侵权，请联系 cloudcommunity@tencent.com 删除。
腾讯云开发者
