There are a few options as described in the [testing flags docs](https://golang.org/cmd/go/#hdr-Testing_flags):

* `go clean -testcache`: expires all test results
* use non-cacheable flags on your test run. The idiomatic way is to use `-count=1`

That said, changes in your code or test code will invalidate the cached test results (there&#39;s extended logic when using local files or environment variables as well), so you should not need to invalidate the test cache manually.

In Go11, I couldn&#39;t disable cache using `GOCACHE` with modules, I used `-count=1` instead: 

    go test -count=1

Prior to Go11: 

    GOCACHE=off go test

Or, clean test cache and run test again: 

    go clean -testcache &amp;&amp; go test 

There&#39;s also `GOCACHE=off` mentioned [here](https://github.com/golang/go/issues/22758#issuecomment-344921828).

The way that I fixed this (I&#39;m using Visual Studio Code on macOS):

Code &gt; Preferences &gt; Settings

Click `...` on the right hand side of the settings page

Click `Open settings.json`

Either:

 1. Add the following snippet to your settings.json file

        &quot;go.testEnvVars&quot;: {
            &quot;GOCACHE&quot;: &quot;off&quot;
        }
 2. Change the value of `go.testEnvVars` to include the following: `&quot;GOCACHE&quot;: &quot;off&quot;`

 

As far as I understood I can use refs for a single element like this:

&lt;!-- begin snippet: js hide: false console: true babel: true --&gt;

&lt;!-- language: lang-js --&gt;

    const { useRef, useState, useEffect } = React;

    const App = () =&gt; {
      const elRef = useRef();
      const [elWidth, setElWidth] = useState();

      useEffect(() =&gt; {
        setElWidth(elRef.current.offsetWidth);
      }, []);

      return (
        &lt;div&gt;
          &lt;div ref={elRef} style={{ width: &quot;100px&quot; }}&gt;
            Width is: {elWidth}
          &lt;/div&gt;
        &lt;/div&gt;
      );
    };

    ReactDOM.render(
      &lt;App /&gt;,
      document.getElementById(&quot;root&quot;)
    );

&lt;!-- language: lang-html --&gt;

    &lt;script src=&quot;https://unpkg.com/react@16/umd/react.production.min.js&quot;&gt;&lt;/script&gt;
    &lt;script src=&quot;https://unpkg.com/react-dom@16/umd/react-dom.production.min.js&quot;&gt;&lt;/script&gt;

    &lt;div id=&quot;root&quot;&gt;&lt;/div&gt;

&lt;!-- end snippet --&gt;

How can I implement this for an array of elements? Obviously not like that: (I knew it even I did not try it:)

&lt;!-- begin snippet: js hide: false console: true babel: true --&gt;

&lt;!-- language: lang-js --&gt;

    const { useRef, useState, useEffect } = React;

    const App = () =&gt; {
      const elRef = useRef();
      const [elWidth, setElWidth] = useState();

      useEffect(() =&gt; {
        setElWidth(elRef.current.offsetWidth);
      }, []);

      return (
        &lt;div&gt;
          {[1, 2, 3].map(el =&gt; (
            &lt;div ref={elRef} style={{ width: `${el * 100}px` }}&gt;
              Width is: {elWidth}
            &lt;/div&gt;
          ))}
        &lt;/div&gt;
      );
    };

    ReactDOM.render(
      &lt;App /&gt;,
      document.getElementById(&quot;root&quot;)
    );

&lt;!-- language: lang-html --&gt;

    &lt;script src=&quot;https://unpkg.com/react@16/umd/react.production.min.js&quot;&gt;&lt;/script&gt;
    &lt;script src=&quot;https://unpkg.com/react-dom@16/umd/react-dom.production.min.js&quot;&gt;&lt;/script&gt;

    &lt;div id=&quot;root&quot;&gt;&lt;/div&gt;

&lt;!-- end snippet --&gt;

I have seen [this][1] and hence [this][2]. But, I&#39;m still confused about how to implement that suggestion for this simple case. 


  [1]: https://github.com/facebook/react/issues/14072
  [2]: https://github.com/facebook/react/issues/14490#issuecomment-454973512

How can I use multiple refs for an array of elements with hooks?

I have a object that I want to output via React:

    question = {
        text: &quot;Is this a good question?&quot;,
        answers: [
           &quot;Yes&quot;,
           &quot;No&quot;,
           &quot;I don&#39;t know&quot;
        ]
    } 

and my react component (cut down), &lt;Answer /&gt; is another component

    class QuestionSet extends Component {
    render(){ 
        &lt;div className=&quot;container&quot;&gt;
           &lt;h1&gt;{this.props.question.text}&lt;/h1&gt;
           {this.props.question.answers.forEach(answer =&gt; {     
               console.log(&quot;Entered&quot;);  //This does ifre                       
               &lt;Answer answer={answer} /&gt;   //THIS DOES NOT WORK 
            })}
    }

    export default QuestionSet;

as you can see from the snippit above, i&#39;m trying to insert an array of the component Answer by using the array Answers in props, it does itterate but is not outputted into HTML.


forEach() in React JSX does not output any HTML

**Problem:**

When I run the same go test twice the second run is not done at all. The results are the cached ones from the first run.

    PASS    
    ok      tester/apitests    (cached)

**Links**

I already checked https://golang.org/cmd/go/#hdr-Testing_flags but there is no cli flag for that purpose.

**Question:**

**Is there a possibility to force go test to always run test and not to cache test results.**



Force retesting or disable test caching

Problem:
When I run the same go test twice the second run is not done at all. The results are the cached ones from the first run.
<pre><code class="hljs language-bash">PASS 
ok tester/apitests (cached)
</code></pre>
Links
I already checked <a href="https://golang.org/cmd/go/#hdr-Testing_flags" target="_blank" rel="noopener noreferrer">https://golang.org/cmd/go/#hdr-Testing_flags</a> but there is no cli flag for that purpose.
Question:
Is there a possibility to force go test to always run test and not to cache test results.

I am going to start rolling out the first version of the application to the internal testers.

But the button `START ROLLOUT TO INTERNAL TEST` is disabled and I cannot see any other error messages or warnings here.

Can anyone let me know what&#39;s going?
[Screenshot attached][1]


  [1]: https://i.stack.imgur.com/uBJAX.png

Google Play Store Internal Test cannot start roll out

So I have used the default docker for testcafe which on docker hub is testcafe/testcafe and I have to run a few testcafe scripts.  

However, I need the screenshot that fires on error, to be uploaded to somewhere where I can look at it later after the docker image is done running.  

I am using the Imgur program which uses bash so I re-did a few things to make it sh compatible and everything works except I need curl.  I tried running 

    apk add curl

but I&#39;m getting the error 

    ERROR: Unable to lock database: Permission denied ERROR: Failed to open apk database: 

Now I no this means that I do not have permission to do this but can I get around this is there some way to become root (this is in bitbucket pipeline).  


I do NOT really want to create my own docker.

Also note all questions I have found relating to this are about installing while creating the docker, however, my question is how to do this after the docker is created.  thx (a fine answer would be another way to save the screen shot, but preferably not with ssh).

Alpine Docker ERROR: Unable to lock database: Permission denied ERROR: Failed to open apk database: Permission denied

I&#39;m working on a Flutter app using Android Studio as my IDE. I&#39;m attempting to write tests and check the code coverage but I can&#39;t work out how to view the data in the IDE or any other application.  

By running `flutter test --coverage`, a coverage report seems to be generated into a file `/coverage/lcov.info`. That file looks something like this:

```lcov
SF:lib\data\Customer.g.dart
DA:9,2
DA:10,2
DA:11,2
DA:12,2
DA:13,2
DA:20,0
DA:21,0
DA:22,0
DA:23,0
DA:24,0
...
```

Looking at the file it seems to have a list of my project files with line by line coverage data. Is there a way to view this information in Android Studio?

How can the code coverage data from Flutter tests be displayed?

I am using andorid studio 3.2 and I am new to testing. I want to add a testing library but I am not getting what should i write in the dependencies section **testImplentation** or **androidTestImplementation**. What is the difference between these two?

android difference between testImplementation and androidTestImplementation in build.gradle

Any ideas on this code

    jest.useFakeTimers() 

    it(&#39;simpleTimer&#39;, async () =&gt; {
      async function simpleTimer(callback) {
        await callback()    // LINE-A without await here, test works as expected.
        setTimeout(() =&gt; {
          simpleTimer(callback)
        }, 1000)
      }

      const callback = jest.fn()
      await simpleTimer(callback)
      jest.advanceTimersByTime(8000)
      expect(callback).toHaveBeenCalledTimes(9)
    }
```

Failed with


    Expected mock function to have been called nine times, but it was called two times.


However, If I remove `await` from LINE-A, the test passes. 

Does Promise and Timer not work well?

I think the reason maybe jest is waiting for second promise to resolve.


Jest: Timer and Promise don&#39;t work well. (setTimeout and async function)

I&#39;ve been given instructions to run `go get &lt;some-remote-git-repo&gt;` which seems to succeed, but it&#39;s not clear to me where the package was installed to so I can run an executable from it.

Per https://golang.org/doc/code.html#remote it seems it will be installed in `$GOPATH/bin` but `$GOPATH` isn&#39;t defined in my shell (though the `go get` command seems to work fine). Go is installed via Homebrew.

Where does go get install packages?

Hi I&#39;m trying to retrieve the function/method of one struct but I&#39;m using an interface as parameter and using this interface I&#39;m trying to access the function of the struct. To demonstrate what I want below is my code

    // Here I&#39;m trying to use &quot;GetValue&quot; a function of RedisConnection but since &quot;c&quot; is an interface it doesn&#39;t know that I&#39;m trying to access the RedisConnection function. How Do I fix this?
    func GetRedisValue(c Connection, key string) (string, error) {
    	value, err := c.GetValue(key)

    	return value, err
    }

    // Connection ...
    type Connection interface {
	    GetClient() (*redis.Client, error)
    }

    // RedisConnection ...
    type RedisConnection struct {}

    // NewRedisConnection ...
    func NewRedisConnection() Connection {
	    return RedisConnection{}
    }

    // GetClient ...
    func (r RedisConnection) GetClient() (*redis.Client, error) {
	    redisHost := &quot;localhost&quot;
    	redisPort := &quot;6379&quot;

    	if os.Getenv(&quot;REDIS_HOST&quot;) != &quot;&quot; {
	    	redisHost = os.Getenv(&quot;REDIS_HOST&quot;)
    	}

	    if os.Getenv(&quot;REDIS_PORT&quot;) != &quot;&quot; {
    		redisPort = os.Getenv(&quot;REDIS_PORT&quot;)
	    }

    	client := redis.NewClient(&amp;redis.Options{
	    	Addr:     redisHost + &quot;:&quot; + redisPort,
		    Password: &quot;&quot;, // no password set
    		DB:       0,  // use default DB
	    })

    	return client, nil
    }

    // GetValue ...
    func (r RedisConnection) GetValue(key string) (string, error) {
	    client, e := r.GetClient()
    	result, err := client.Ping().Result()
    	return result, nil
    }

Golang Cast interface to struct

I have an outer and inner loop, each iterating over a range. I want to exit the outer loop when a condition is satisfied inside the inner loop.

I have a solution which works using two &#39;break&#39;s, one inside the inner loop and one inside the outerloop, just outside the inner loop (a very simplified case for demonstration):

    package main
    
    import (
    	&quot;fmt&quot;
    )
    
    func main() {
    	
    	word := &quot;&quot;
    	for _, i := range(&quot;ABCDE&quot;) {
    		for _,j := range(&quot;ABCDE&quot;) {
    			word = string(i) + string(j)
    			fmt.Println(word)
    			if word == &quot;DC&quot; {
    				break
    			}
    		}
    		if word == &quot;DC&quot; {
    			break
    		}
    	}
    	// More logic here that needs to be executed
    }
[Go Playground][1]

There is no problem with this solution, but it just looks patched and ugly to me. Is there a better way to do this?

I can try and have another for conditional loop outside the outer loop in the previous solution and have a label and use continue with the label. But as you can see, this approach isn&#39;t any more elegant than the solution with break.

    package main
    
    import (
    	&quot;fmt&quot;
    )
    
    func main() {
    
    	word := &quot;&quot;
    
    Exit:
    	for word != &quot;DC&quot; {
    		for _, i := range &quot;ABCDE&quot; {
    			for _, j := range &quot;ABCDE&quot; {
    				word = string(i) + string(j)
    				fmt.Println(word)
    				if word == &quot;DC&quot; {
    					continue Exit
    				}
    			}
    		}
    	}
    	// More logic here that needs to be executed
    }
[Go Playground][2]

I have seen similar questions here pertaining to other languages (C, C#, Python etc). But what I am really interested to see is whether there is any trick with Go constructs such as &#39;for select&#39;.


  [1]: https://play.golang.org/p/URY29ukzp9A
  [2]: https://play.golang.org/p/cWrqtDV34L4

How to break out of nested loops in Go?

I&#39;m trying out Go&#39;s new modules system and am having trouble accessing local packages. The following project is in a folder on my desktop outside my gopath.

My project structure looks like:

    /
      - /platform
          - platform.go
      - main.go
      - go.mod

----

    // platform.go
    package platform
    
    import &quot;fmt&quot;

    func Print() {
        fmt.Println(&quot;Hi&quot;)
    }


---

    // main.go
    package main
    
    import &quot;platform&quot;

    func main() {
        platform.Print()
    }

`go build main.go` tells me

    cannot find module for path platform

Accessing local packages within a go module (go 1.11)

As we all know, panics produce a stacktrace to stdout ([Playground link][1]).:

    panic: runtime error: index out of range
    goroutine 1 [running]:
    main.main()
    	/tmp/sandbox579134920/main.go:9 +0x20

And it seems when you recover from a panic, `recover()` returns only an `error` which describes what caused the panic ([Playground link][2]). 

    runtime error: index out of range

My question is, is it possible to store the stacktrace which is written to stdout? This provides much better debugging information than the string `runtime error: index out of range` because it shows the exact line in a file which caused the panic.


  [1]: https://play.golang.org/p/b-Uz6eTkVJ-
  [2]: https://play.golang.org/p/7qsB3F2klUb

Content Type	Original Author	Original Content on Stackoverflow
Question	Simon Frey	View Question on Stackoverflow
Solution 1 - Testing	Marc	View Answer on Stackoverflow
Solution 2 - Testing	Muhammad Soliman	View Answer on Stackoverflow
Solution 3 - Testing	soltysh	View Answer on Stackoverflow
Solution 4 - Testing	distortedsignal	View Answer on Stackoverflow

Force retesting or disable test caching

Testing Problem Overview

Testing Solutions

Solution 1 - Testing

Solution 2 - Testing

Solution 3 - Testing

Solution 4 - Testing

forEach() in React JSX does not output any HTML

How can I use multiple refs for an array of elements with hooks?

Attributions