【Software Testing】Dryrun

Dry-run

A dry run (or a practice run) is a testing process where the effects of a possible failure are intentionally mitigated. For example, an aerospace company may conduct a “dry run” test of a jet’s new pilot ejection seat while the jet is parked on the ground, rather than while it is in flight.

The usage of “dry run” in acceptance procedures (for example in the so-called FAT = factory acceptance testing) is meant as following: the factory — which is a subcontractor — must perform a complete test of the system it has to deliver before the actual acceptance by customer.

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Posted by Wei on 2021-10-07, Last Modified on 2024-05-02

【Golang】Reactor in Golang

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Posted by Wei on 2021-10-03, Last Modified on 2023-11-03

【Golang】关键字 - select

Overall

The select statement provides another way to handle multiple channels.

It’s like a switch, but each case is a communication:

All channels are evaluated.
Selection blocks until one communication can proceed, which then does.
If multiple can proceed, select chooses pseudo-randomly.
A default clause, if present, executes immediately if no channel is ready.

    select {
    case v1 := <-c1:
        fmt.Printf("received %v from c1\n", v1)
    case v2 := <-c2:
        fmt.Printf("received %v from c2\n", v1)
    case c3 <- 23:
        fmt.Printf("sent %v to c3\n", 23)
    default:
        fmt.Printf("no one was ready to communicate\n")
    }

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Posted by Wei on 2021-10-03, Last Modified on 2023-08-23

【Golang】设计模式 - Pipeline

Pipeline Pattern

Pipeline这种技术在可以很容易的把代码按单一职责的原则拆分成多个高内聚低耦合的小模块，然后可以很方便地（通过channel）拼装起来去完成比较复杂的功能。

Informally, a pipeline is a series of stages connected by channels, where each stage is a group of goroutines running the same function. In each stage, the goroutines

receive values from upstream via inbound channels
perform some function on that data, usually producing new values
send values downstream via outbound channels

Each stage has any number of inbound and outbound channels, except the first and last stages, which have only outbound or inbound channels, respectively. The first stage is sometimes called the source or producer; the last stage, the sink or consumer.

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Posted by Wei on 2021-10-03, Last Modified on 2024-05-07

【Golang】设计模式 - Generator

Generator Pattern

Channels are first-class values, just like strings or integers.

package main

import (
	"fmt"
	"math/rand"
	"time"
)

func boring(msg string) <-chan string { // Returns receive-only channel of strings.
	c := make(chan string)
	go func() { // We launch the goroutine from inside the function.
		for i := 0; ; i++ {
			c <- fmt.Sprintf("%s %d", msg, i)
			time.Sleep(time.Duration(rand.Intn(1e3)) * time.Millisecond)
		}
	}()
	return c // Return the channel to the caller.
}

func main() {
	c := boring("boring!") // Function returning a channel.
	for i := 0; i < 5; i++ {
		fmt.Printf("You say: %q\n", <-c)
	}
	fmt.Println("You're boring; I'm leaving.")
}

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Posted by Wei on 2021-10-03, Last Modified on 2025-04-23

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