I have a while controller that waits for a certain regular expression to appear in the response before logging the user out. However, due to timeouts with the previous request this will occasionally enter into an infinite loop, skewing the data. I'm looking to set this request so that it only sends 5 times before exiting the loop and logging the user out.
After searching for an answer it seems that either the ${__counter()} variable or Counter Config Element are the solution, but neither seem to be working as I would expect.
Here is what I've got so far:
While Controller (${__javaScript( "${DONE_A}" != "Thank you for your order" || ${counter} < 5;)}
Counter (set to 5, increment 1)
Constant Timer (2000 ms)
GET /checkout/confirmation
^RegExp Extractor (DONE)
Logout
I can see a couple of problems with your script:
During 1st iteration counter value is NaN, you need to either declare it via i.e. User Defined Variables or to add check for "Not a Number" into your condition
You cannot refer variables as ${counter} in __JavaScript function. If you need to address it, you need to surround the variable with quotation marks (like you do for your DONE_A variable. If you need to treat the variable like a numeric one - use i.e. parseInt() function
Given point 2, my expectation is what your While controller clause simply does not work, that's why you're getting an endless loop.
This one should be good for your scenario:
${__javaScript(isNaN(parseInt("${counter}")) || parseInt("${counter}") < 5 && "${DONE_A}" != "Thank you for your order",)}
Related
I would like to know if it is possible to reset the thread context (all of its variables) at the begining of a new iteration.
The problem that I am having is that the thread keeps all the variables (and its values) from its previous iterations and sometimes it things can get messy.
If I am not mistaken, on VisualStudio Performance tests you can specify the percentage of "new users" to indicate how many VirtualUsers are going to have its contexts reseted on their next test iteration.
Do we have something similar native on JMeter or do we need to write some code to do it?
Thanks in advance!
I'm not sure you really want/need it, but you can remove all JMeter variables using JSR223 script with remove method:
for (Map.Entry entry : vars.entrySet()) {
vars.put(entry.getKey(), null);
}
It depends on the type of variables you create and how you use them.
For ex:
Regular Expression Extractor
Here It creates a variable regex.var and if the response matches the expression it will have some value assigned to it. If the next iteration does not match the expression, It will still keep the previous iteration value. To avoid this problem, assign a default value or check the 'Use empty default value'. so that every iteration will basically reset the value.
User Designed Variables - Each and every thread will have its own copy of the variable and threads could be modifying its variable value throughout the entire duration of the test. If you want that to be reset for every iteration, it is completely your responsibility.
I think this could be helpful.
JMeter - Understanding Variables Scope
I've created a While Controller in Apache JMeter that I want to run for 10 minutes or until an exit condition is met. However the following function doesn't work.
${__jexl3(
("${start}" + 600000) > "${__time()}" || "${exit}"
)}
I'm new to JMeter. I may be misunderstanding how the JEXL evaluation works.
You need to remove quotation marks around the variables, otherwise __jexl3() function would be comparing Strings instead of Longs
${__jexl3(${start} + 600000 > ${__time(,)},)}
You can use i.e. Dummy Sampler in order to evaluate various parts of the expression and the whole expression. The results can be visualized via View Results Tree listener.
I'ts my first tme using Cypress and I almost finalized my first test. But to do so I need to assert against a unknown number. Let me explain:
When the test starts, a random number of elements is generated and I shouldn't have control on such a number (is a requirement). So, I'm trying to get such number in this way:
var previousElems = cy.get('.list-group-item').its('length');
I'm not really sure if I'm getting the right data, since I can not log it (the "cypress console" shows me "[Object]" when I print it). But let's say such line returns (5) to exemplify.
During the test, I simulate a user creating extra elements (2) and removing an (1) element. Let's say the user just creates one single extra element.
So, at the end os the test, I need to check if the number of eements with the same class are equals to (5+2-1) = (6) elements. I'm doing it in this way:
cy.get('.list-group-item').its('length').should('eq', (previousTasks + 1));
But I get the following message:
CypressError: Timed out retrying: expected 10 to equal '[object Object]1'
So, how can I log and assert this?
Thanks in advance,
PD: I also tryed:
var previousTasks = (Cypress.$("ul").children)? Cypress.$("ul").children.length : 0;
But it always returns a fixed number (2), even if I put a wait before to make sure all the items are fully loaded.
I also tryed the same with childNodes but it always return 0.
Your problem stems from the fact that Cypress test code is run all at once before the test starts. Commands are queued to be run later, and so storing variables as in your example will not work. This is why you keep getting objects instead of numbers; the object you're getting is called a chainer, and is used to allow you to chain commands off other commands, like so: cy.get('#someSelector').should('...');
Cypress has a way to get around this though; if you need to operate on some data directly, you can provide a lambda function using .then() that will be run in order with the rest of your commands. Here's a basic example that should work in your scenario:
cy.get('.list-group-item').its('length').then(previousCount => {
// Add two elements and remove one...
cy.get('.list-group-item').its('.length').should('eq', previousCount + 1);
});
If you haven't already, I strongly suggest reading the fantastic introduction to Cypress in the docs. This page on variables and aliases should also be useful in this case.
I'm building a Sequence job that contains a UserVariables activity (ParamLoading) and a Job activity (ExtractJob), in that order. ParamLoading creates 4 user variables and invokes a routine to fill each one with the correspondng value, then invokes ExtractJob pasiing it the parametes previously loaded.
ParamLoading invokes a server routine (GetParams) which simply executes a shell script (ShellQuery) and captures the result; that shell script executes an SQL query against an Oracle database and prints the result on screen.
As far as tests go, ShellQuery works as expected and GetParams returns the expected value. But when GetParams is invoked from the sequence job (no matter if it's in ParamLoading or ExtractJob) the job fails with the following error:
Test2..JobControl (#JOB033_TBK_026_EXT_PTLF): Controller problem: Error calling DSSetParam(RUTA_ORIGEN), code=-4
[ParamValue/Limitvalue is not appropriate]
I've checked data types, parameter names, all, without success or even a message saying what might be happening.
Code of ShellQuery:
value=$(sqlplus -s $1/$2#$3/$4 <<!
set heading off
set feedback off
set pages 0
select param_value from cfg_params where filter='$5' and param_name='$6';
!)
echo $value
Code of GetParams:
Call DSExecute("UNIX", Ruta_Programas:"getparams.sh ":Username:" ":Password:" ":Server:" ":ServiceId:" ":Filtro:" ":Parametro, Output, SystemReturnCode)
Ans = Output
Return(Ans)
What are you returning as values from GetParams?
Calling a function from a sequence expects an integer value back and any non-zero digit returned is evaluated as an error.
As a test, try changing the return value from the routines to values 0-4.
Solved. For those struggling with a similar problem, GetParams was returning the captured value from ShellQuery adding a special character called "field delimiter", and given that the character is a 254 in ASCII, any job receiving the parameter would complain of an invalid value, which was the error.
Changing the routine to the following solved it:
Call DSExecute("UNIX", Ruta_Programas:"getparams.sh ":Username:" ":Password:" ":Server:" ":ServiceId:" ":Filtro:" ":Parametro, Output, SystemReturnCode)
Ans = EReplace(Output, #FM, "")
Return(Ans)
Thanks to Matt Calderon for providing a clue for solving.
I was reading the JMeter documentation and came across this info box about "If Controllers":
No variables are made available to the script when the condition is interpreted as Javascript. If you need access to such variables, then select "Interpret Condition as Variable Expression?" and use a __javaScript() function call. You can then use the objects "vars", "log", "ctx" etc. in the script.
I don't quite follow this. Does this mean if I want access to a "User Defined Parameter" then I can access it only by writing some JavaScript? The example that follows this box then refers to "${COUNT}"
Could someone clarify the usage of the If Controller, maybe with an example or two?
All these answers are wrong! You need to put the variable reference in quotes, like so:
"${my_variable}"=="foo"
You can simply use something like
${my_variable}=='1'
Sometimes JMeter documentation can be confusing :)
Edit 27 september 2017:
The answer here works but has a very bad performance impact when number of threads exceeds 40.
See below for correct and most performing answer:
https://stackoverflow.com/a/46976447/460802
See:
https://bz.apache.org/bugzilla/show_bug.cgi?id=61675
UNCHECK the CHECKBOX
"Interpret condition as variable expression"
I wasted a couple of hours without unchecking this checkbox. It worked with and without semicolon(;) at the end of the statement. Make sure that you have set the User-Defined Variables before calling the if controller.
All the following variations worked for me in Jakarta Jmeter 1.5
${__javaScript("${HOMEPAGE}"=="Y")}
${__javaScript("${HOMEPAGE}"=="Y")};
"${HOMEPAGE}"=="Y"
"${HOMEPAGE}"=="Y";
If Controller will internally use javascript to evaluate the condition but this can have a performance penalty.
A better option (default one starting from JMeter 4, see https://bz.apache.org/bugzilla/show_bug.cgi?id=61675) is to check "Interpret Condition as Variable Expression?", then in the condition field you have 2 options:
Option 1 : Use a variable that contains true or false. For example If you want to test if last sample was successful, you can use
${JMeterThread.last_sample_ok}
or any variable you want that contains true/false
${myVar}
Option 2 : Use a function (${__jexl3()} is advised) to evaluate an expression that must return true or false.
For example if COUNT is equal to 1:
${__jexl3("${COUNT}"== "1",)}
OR
${__jexl3(${COUNT}== 1,)}
Starting with 4.0, if you don't use the "Interpret Condition as Variable Expression?", a warning in RED will be displayed:
If you'd like to learn more about JMeter and performance testing this book can help you.
God bless the http://habrahabr.ru
Have tried until found these.
Using the quotes was my solution.
As Gerrie said you need to check your variable
${my_var} == 'value'
But be careful with the 'User Defined Variables'
Note that all the UDV elements in a
test plan - no matter where they are -
are processed at the start.
That basically means that you cannot define 'User Defined Variables' inside an 'If Controller'. Take a look to the 'BeanShell' instead.
Replace:
${my_variable}=='1'
with
"${my_variable}" == "1"
if it's string value pass as below and its performance effective
${__groovy("${key}"=="value")}
I have used ${code_g1}== 200 in condition and it worked for me.