I just recently started on writing Powershell scripts. I have a project where I'm performing Load Tests. I Run the test and Generate a Report based on the result of the test. The tool I am using does that all through their API's. So I have 3 Rest API's that I am sending calls using Powershell script.

1st call: Starts a Load Testing for however many iteration is setup in the configuration (Maybe it runs for hours):

Invoke-RestMethod -Method Post -Uri $StartTestUrl -ContentType "application/json" -OutVariable StartTestResponse -Body $StartTestRequestBody | ConvertTo-Json
2nd call: Gets status of the Load Test we just ran/or still running:
Invoke-RestMethod -Method Post -Uri $GetStatusUrl -ContentType "application/json" -OutVariable GetStatusResponse -Body $GetStatusRequestBody | ConvertTo-Json
3rd call: Generate Report From the finished Test Run:
Invoke-RestMethod -Method Post -Uri $GenerateReportUrl -ContentType "application/json" -OutVariable GenerateReportResponse -Body $GenerateReportRequestBody | ConvertTo-Json
Goal: I want to able to write a DO-WHILE loop or other loops in Powershell that checks the status of the test by calling 2nd api every minute for the status "DONE" in the response. And then start the 3rd call, because if the test is not DONE, I cannot generate a report. 
Example: 
foreach(var minute in minutes)
    // if(status.Done)
    //   CALL GenerateReport
    // else
        //keep checking every minute 
        
You can do this using a do-while loop. In this example, it's assumed that the $GetStatusResponse is just a $true/$false value. In reality you will need to modify the code to check for the actual "DONE" message.
Invoke-RestMethod -Method Post -Uri $StartTestUrl -ContentType "application/json" -OutVariable StartTestResponse -Body $StartTestRequestBody | ConvertTo-Json
    Invoke-RestMethod -Method Post -Uri $GetStatusUrl -ContentType "application/json" -OutVariable GetStatusResponse -Body $GetStatusRequestBody | ConvertTo-Json
    if($GetStatusResponse -eq $False){
        Start-Sleep -Seconds 60
}while($GetStatusResponse -eq $False)
Invoke-RestMethod -Method Post -Uri $GenerateReportUrl -ContentType "application/json" -OutVariable GenerateReportResponse -Body $GenerateReportRequestBody | ConvertTo-Json
                Will this keep running for every minute until we get a True response from $GetStatusResponse?
                    – Shahboz
                Jan 28 '18 at 21:49
                @Hashim77 Yes. For the 2nd call. The condition $GetStatusResponse -eq $False is simplified; you will probably have to modify it to fit your code.
                    – gms0ulman
                Jan 28 '18 at 21:54
                Right, once the 2nd call is called I get a response as such: {     "d":  {               "ApiKey":  "#####",               "Status":  "DONE"           } }
                    – Shahboz
                Jan 28 '18 at 21:56
                If it is not DONE, I need to re-check after 1 minute. So I assume, I need to extract the Status from response body and check it like while($GetStatusResponse.Status eq "Done")?
                    – Shahboz
                Jan 28 '18 at 21:58
                @Hashim77 Exactly! Except you want -ne, as in "keep running while status is NOT Done".
                    – gms0ulman
                Jan 28 '18 at 22:02
        
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